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Separate charged molecules inside a narrow capillary by controlling electric field, buffer, temperature, injection and detection while keeping electroosmotic flow and migration order visible
Read FDA’s final September 2010 Q4B Annex 11 through capillary zone electrophoresis, electroosmotic flow, coated capillaries, buffers, voltage, temperature, injection, detection, migration time, peak area, system suitability and investigation.
A capillary thinner than a drinking straw can separate a complex mixture in minutes. Charged species migrate in an electric field while the solution itself may move through electroosmotic flow, producing a time-resolved electropherogram.
FDA lists Q4B Annex 11, Capillary Electrophoresis General Chapter, as final guidance dated September 2010, with docket FDA-2009-D-0579 and CDER and CBER as issuing offices.
Did you know? In capillary zone electrophoresis, a strongly charged small ion and a weakly charged larger molecule can reach the detector in an order that reflects both their electrophoretic mobility and the bulk flow of buffer.
For students, the instrument is a compact system-thinking lesson: capillary surface, pH, ionic strength, voltage, heat, injection plug and detector all shape the final peaks.
Chapter index
Chapters 1–9: final September 2010 Q4B Annex 11
- 1. Annex 11 owns the harmonised capillary-electrophoresis pharmacopoeial intent
- 2. FDA lists Annex 11 as final guidance from September 2010
- 3. Electrophoretic mobility reflects charge and hydrodynamic resistance
- 4. Electroosmotic flow moves much of the solution through the capillary
- 5. Capillary surface chemistry can improve difficult separations
- 6. Buffer pH sets analyte charge and wall behaviour
- 7. Ionic strength balances current, heat and selectivity
- 8. Voltage determines field strength and migration speed
- 9. Temperature controls viscosity and mobility
Chapters 10–17: capillary electrophoresis, electroosmotic flow, buffers, migration time, peaks, suitability and investigations
- 10. Hydrodynamic and electrokinetic injections sample differently
- 11. Sample solvent and concentration influence focusing and shape
- 12. Detection creates peaks from the migrating zones
- 13. Migration-time markers improve run-to-run comparison
- 14. System suitability proves that the run can answer its question
- 15. Peak integration needs transparent boundaries
- 16. Method changes can alter selectivity unexpectedly
- 17. A complete Annex 11 receipt reconstructs each electropherogram
CHAPTER 1 OF 17 · See the capillary system
1. Annex 11 owns the harmonised capillary-electrophoresis pharmacopoeial intent
The annex evaluates selected capillary electrophoresis general chapters for interchangeable use under stated regional conditions. A product method still needs defined purpose, performance, system suitability and acceptance criteria.
The scientific value of annex 11 owns the harmonised capillary-electrophoresis pharmacopoeial intent appears when the observation, method and quality decision remain connected. The annex evaluates selected capillary electrophoresis general chapters for interchangeable use under stated regional conditions. A product method still needs defined purpose, performance, system suitability and acceptance criteria. Keep this boundary visible: Migration time alone does not establish molecular identity.
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Build an evidence receipt for annex 11 owns the harmonised capillary-electrophoresis pharmacopoeial intent. Trace annex 11 owns the harmonised capillary-electrophoresis pharmacopoeial intent from capillary conditioning through injection, separation, detection and calculation. Add the source version, equipment identity and acceptance rule. Keep this limit: Migration time alone does not establish molecular identity.
A strong science note separates observation from interpretation. Trace annex 11 owns the harmonised capillary-electrophoresis pharmacopoeial intent from capillary conditioning through injection, separation, detection and calculation. Record the source, version or date, population or device context, method, result and one uncertainty. If the official record does not show a field, write “not shown” instead of filling the gap from memory.
Evidence checkpoint
Trace annex 11 owns the harmonised capillary-electrophoresis pharmacopoeial intent from capillary conditioning through injection, separation, detection and calculation. Keep this boundary visible: Migration time alone does not establish molecular identity.
CHAPTER 2 OF 17 · See the capillary system
2. FDA lists Annex 11 as final guidance from September 2010
The official page identifies final status, docket FDA-2009-D-0579 and CDER and CBER as issuing offices. A current receipt records the annex, chapter edition, separation mode and validated procedure.
For fda lists annex 11 as final guidance from september 2010, a reliable result depends on both the material and the controlled measurement system. The official page identifies final status, docket FDA-2009-D-0579 and CDER and CBER as issuing offices. A current receipt records the annex, chapter edition, separation mode and validated procedure. Preserve this guardrail: Electroosmotic flow and analyte mobility both shape observed order.
Try this
Challenge the assumptions behind fda lists annex 11 as final guidance from september 2010. Challenge buffer, temperature, voltage, current, surface interaction and injection behind fda lists annex 11 as final guidance from september 2010. Test one realistic failure mode and record what changes. Respect this boundary: Electroosmotic flow and analyte mobility both shape observed order.
A strong science note separates observation from interpretation. Challenge buffer, temperature, voltage, current, surface interaction and injection behind fda lists annex 11 as final guidance from september 2010. Record the source, version or date, population or device context, method, result and one uncertainty. If the official record does not show a field, write “not shown” instead of filling the gap from memory.
Evidence checkpoint
Challenge buffer, temperature, voltage, current, surface interaction and injection behind fda lists annex 11 as final guidance from september 2010. Keep this boundary visible: Electroosmotic flow and analyte mobility both shape observed order.
CHAPTER 3 OF 17 · See the capillary system
3. Electrophoretic mobility reflects charge and hydrodynamic resistance
In an electric field, ions move according to effective charge, size, shape and the properties of the medium. The sign and magnitude of mobility help determine migration relative to electroosmotic flow.
A trustworthy account of electrophoretic mobility reflects charge and hydrodynamic resistance keeps preparation, apparatus, timing, calculation and review in one traceable route. In an electric field, ions move according to effective charge, size, shape and the properties of the medium. The sign and magnitude of mobility help determine migration relative to electroosmotic flow. Remember: Injection mode can bias which species enter the capillary.
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Audit the laboratory route for electrophoretic mobility reflects charge and hydrodynamic resistance. Reconstruct electrophoretic mobility reflects charge and hydrodynamic resistance from raw electropherograms, audit trail, standards and suitability. Mark every handoff where identity, contamination, time or units could be lost. Preserve this caution: Injection mode can bias which species enter the capillary.
A strong science note separates observation from interpretation. Reconstruct electrophoretic mobility reflects charge and hydrodynamic resistance from raw electropherograms, audit trail, standards and suitability. Record the source, version or date, population or device context, method, result and one uncertainty. If the official record does not show a field, write “not shown” instead of filling the gap from memory.
Evidence checkpoint
Reconstruct electrophoretic mobility reflects charge and hydrodynamic resistance from raw electropherograms, audit trail, standards and suitability. Keep this boundary visible: Injection mode can bias which species enter the capillary.
CHAPTER 4 OF 17 · See the capillary system
4. Electroosmotic flow moves much of the solution through the capillary
Charges at the fused-silica wall create an electrical double layer whose movement can carry buffer toward the detector. pH, surface condition and additives affect this bulk flow and therefore migration times.
The scientific value of electroosmotic flow moves much of the solution through the capillary appears when the observation, method and quality decision remain connected. Charges at the fused-silica wall create an electrical double layer whose movement can carry buffer toward the detector. pH, surface condition and additives affect this bulk flow and therefore migration times. Keep this boundary visible: Manual integration changes must remain visible and justified.
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Build an evidence receipt for electroosmotic flow moves much of the solution through the capillary. Reassess electroosmotic flow moves much of the solution through the capillary after a capillary, coating, buffer, instrument, detector or software change. Add the source version, equipment identity and acceptance rule. Keep this limit: Manual integration changes must remain visible and justified.
A strong science note separates observation from interpretation. Reassess electroosmotic flow moves much of the solution through the capillary after a capillary, coating, buffer, instrument, detector or software change. Record the source, version or date, population or device context, method, result and one uncertainty. If the official record does not show a field, write “not shown” instead of filling the gap from memory.
Evidence checkpoint
Reassess electroosmotic flow moves much of the solution through the capillary after a capillary, coating, buffer, instrument, detector or software change. Keep this boundary visible: Manual integration changes must remain visible and justified.
CHAPTER 5 OF 17 · Control mobility and injection
5. Capillary surface chemistry can improve difficult separations
Bare or coated capillaries are selected to control electroosmotic flow and analyte interaction. Protein adsorption can distort peaks and change recovery, so conditioning and coating integrity are monitored.
For capillary surface chemistry can improve difficult separations, a reliable result depends on both the material and the controlled measurement system. Bare or coated capillaries are selected to control electroosmotic flow and analyte interaction. Protein adsorption can distort peaks and change recovery, so conditioning and coating integrity are monitored. Preserve this guardrail: Migration time alone does not establish molecular identity.
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Challenge the assumptions behind capillary surface chemistry can improve difficult separations. Trace capillary surface chemistry can improve difficult separations from capillary conditioning through injection, separation, detection and calculation. Test one realistic failure mode and record what changes. Respect this boundary: Migration time alone does not establish molecular identity.
A strong science note separates observation from interpretation. Trace capillary surface chemistry can improve difficult separations from capillary conditioning through injection, separation, detection and calculation. Record the source, version or date, population or device context, method, result and one uncertainty. If the official record does not show a field, write “not shown” instead of filling the gap from memory.
Evidence checkpoint
Trace capillary surface chemistry can improve difficult separations from capillary conditioning through injection, separation, detection and calculation. Keep this boundary visible: Migration time alone does not establish molecular identity.
CHAPTER 6 OF 17 · Control mobility and injection
6. Buffer pH sets analyte charge and wall behaviour
Small pH shifts can alter ionisation, selectivity and electroosmotic flow. Buffer identity, concentration, preparation, filtration, storage and actual pH are controlled at the relevant temperature.
A trustworthy account of buffer ph sets analyte charge and wall behaviour keeps preparation, apparatus, timing, calculation and review in one traceable route. Small pH shifts can alter ionisation, selectivity and electroosmotic flow. Buffer identity, concentration, preparation, filtration, storage and actual pH are controlled at the relevant temperature. Remember: Electroosmotic flow and analyte mobility both shape observed order.
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Audit the laboratory route for buffer ph sets analyte charge and wall behaviour. Challenge buffer, temperature, voltage, current, surface interaction and injection behind buffer ph sets analyte charge and wall behaviour. Mark every handoff where identity, contamination, time or units could be lost. Preserve this caution: Electroosmotic flow and analyte mobility both shape observed order.
A strong science note separates observation from interpretation. Challenge buffer, temperature, voltage, current, surface interaction and injection behind buffer ph sets analyte charge and wall behaviour. Record the source, version or date, population or device context, method, result and one uncertainty. If the official record does not show a field, write “not shown” instead of filling the gap from memory.
Evidence checkpoint
Challenge buffer, temperature, voltage, current, surface interaction and injection behind buffer ph sets analyte charge and wall behaviour. Keep this boundary visible: Electroosmotic flow and analyte mobility both shape observed order.
CHAPTER 7 OF 17 · Control mobility and injection
7. Ionic strength balances current, heat and selectivity
A more conductive buffer can increase current and Joule heating, while composition also changes mobility and interactions. The method keeps current within the expected range and uses cooling to stabilise conditions.
The scientific value of ionic strength balances current, heat and selectivity appears when the observation, method and quality decision remain connected. A more conductive buffer can increase current and Joule heating, while composition also changes mobility and interactions. The method keeps current within the expected range and uses cooling to stabilise conditions. Keep this boundary visible: Injection mode can bias which species enter the capillary.
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Build an evidence receipt for ionic strength balances current, heat and selectivity. Reconstruct ionic strength balances current, heat and selectivity from raw electropherograms, audit trail, standards and suitability. Add the source version, equipment identity and acceptance rule. Keep this limit: Injection mode can bias which species enter the capillary.
A strong science note separates observation from interpretation. Reconstruct ionic strength balances current, heat and selectivity from raw electropherograms, audit trail, standards and suitability. Record the source, version or date, population or device context, method, result and one uncertainty. If the official record does not show a field, write “not shown” instead of filling the gap from memory.
Evidence checkpoint
Reconstruct ionic strength balances current, heat and selectivity from raw electropherograms, audit trail, standards and suitability. Keep this boundary visible: Injection mode can bias which species enter the capillary.
CHAPTER 8 OF 17 · Control mobility and injection
8. Voltage determines field strength and migration speed
Applied polarity and magnitude follow the procedure. Higher field can shorten analysis but also increase heat. Actual voltage, current and run time are retained so an abnormal separation can be reconstructed.
For voltage determines field strength and migration speed, a reliable result depends on both the material and the controlled measurement system. Applied polarity and magnitude follow the procedure. Higher field can shorten analysis but also increase heat. Actual voltage, current and run time are retained so an abnormal separation can be reconstructed. Preserve this guardrail: Manual integration changes must remain visible and justified.
Try this
Challenge the assumptions behind voltage determines field strength and migration speed. Reassess voltage determines field strength and migration speed after a capillary, coating, buffer, instrument, detector or software change. Test one realistic failure mode and record what changes. Respect this boundary: Manual integration changes must remain visible and justified.
A strong science note separates observation from interpretation. Reassess voltage determines field strength and migration speed after a capillary, coating, buffer, instrument, detector or software change. Record the source, version or date, population or device context, method, result and one uncertainty. If the official record does not show a field, write “not shown” instead of filling the gap from memory.
Evidence checkpoint
Reassess voltage determines field strength and migration speed after a capillary, coating, buffer, instrument, detector or software change. Keep this boundary visible: Manual integration changes must remain visible and justified.
CHAPTER 9 OF 17 · Read the electropherogram
9. Temperature controls viscosity and mobility
Capillary temperature influences buffer viscosity, electrophoretic mobility and electroosmotic flow. A small change can shift migration time or resolution, so thermostat performance and actual settings are part of the raw record.
A trustworthy account of temperature controls viscosity and mobility keeps preparation, apparatus, timing, calculation and review in one traceable route. Capillary temperature influences buffer viscosity, electrophoretic mobility and electroosmotic flow. A small change can shift migration time or resolution, so thermostat performance and actual settings are part of the raw record. Remember: Migration time alone does not establish molecular identity.
Try this
Audit the laboratory route for temperature controls viscosity and mobility. Trace temperature controls viscosity and mobility from capillary conditioning through injection, separation, detection and calculation. Mark every handoff where identity, contamination, time or units could be lost. Preserve this caution: Migration time alone does not establish molecular identity.
A strong science note separates observation from interpretation. Trace temperature controls viscosity and mobility from capillary conditioning through injection, separation, detection and calculation. Record the source, version or date, population or device context, method, result and one uncertainty. If the official record does not show a field, write “not shown” instead of filling the gap from memory.
Evidence checkpoint
Trace temperature controls viscosity and mobility from capillary conditioning through injection, separation, detection and calculation. Keep this boundary visible: Migration time alone does not establish molecular identity.
CHAPTER 10 OF 17 · Read the electropherogram
10. Hydrodynamic and electrokinetic injections sample differently
Pressure or vacuum introduces a volume based on fluid movement, while voltage-based injection can favour ions according to mobility. Injection mode, time and magnitude are controlled because the plug defines sensitivity and peak shape.
The scientific value of hydrodynamic and electrokinetic injections sample differently appears when the observation, method and quality decision remain connected. Pressure or vacuum introduces a volume based on fluid movement, while voltage-based injection can favour ions according to mobility. Injection mode, time and magnitude are controlled because the plug defines sensitivity and peak shape. Keep this boundary visible: Electroosmotic flow and analyte mobility both shape observed order.
Try this
Build an evidence receipt for hydrodynamic and electrokinetic injections sample differently. Challenge buffer, temperature, voltage, current, surface interaction and injection behind hydrodynamic and electrokinetic injections sample differently. Add the source version, equipment identity and acceptance rule. Keep this limit: Electroosmotic flow and analyte mobility both shape observed order.
A strong science note separates observation from interpretation. Challenge buffer, temperature, voltage, current, surface interaction and injection behind hydrodynamic and electrokinetic injections sample differently. Record the source, version or date, population or device context, method, result and one uncertainty. If the official record does not show a field, write “not shown” instead of filling the gap from memory.
Evidence checkpoint
Challenge buffer, temperature, voltage, current, surface interaction and injection behind hydrodynamic and electrokinetic injections sample differently. Keep this boundary visible: Electroosmotic flow and analyte mobility both shape observed order.
CHAPTER 11 OF 17 · Read the electropherogram
11. Sample solvent and concentration influence focusing and shape
Conductivity mismatch, excessive concentration, particulates or adsorption can broaden, front or split peaks. Preparation, dilution, filtration or centrifugation and hold time are justified for the analytes and matrix.
For sample solvent and concentration influence focusing and shape, a reliable result depends on both the material and the controlled measurement system. Conductivity mismatch, excessive concentration, particulates or adsorption can broaden, front or split peaks. Preparation, dilution, filtration or centrifugation and hold time are justified for the analytes and matrix. Preserve this guardrail: Injection mode can bias which species enter the capillary.
Try this
Challenge the assumptions behind sample solvent and concentration influence focusing and shape. Reconstruct sample solvent and concentration influence focusing and shape from raw electropherograms, audit trail, standards and suitability. Test one realistic failure mode and record what changes. Respect this boundary: Injection mode can bias which species enter the capillary.
A strong science note separates observation from interpretation. Reconstruct sample solvent and concentration influence focusing and shape from raw electropherograms, audit trail, standards and suitability. Record the source, version or date, population or device context, method, result and one uncertainty. If the official record does not show a field, write “not shown” instead of filling the gap from memory.
Evidence checkpoint
Reconstruct sample solvent and concentration influence focusing and shape from raw electropherograms, audit trail, standards and suitability. Keep this boundary visible: Injection mode can bias which species enter the capillary.
CHAPTER 12 OF 17 · Read the electropherogram
12. Detection creates peaks from the migrating zones
UV absorbance, fluorescence or another detector has defined wavelength, path, response and sensitivity. Data rate and detector settings are controlled, and identity is not assigned from one migration time alone.
A trustworthy account of detection creates peaks from the migrating zones keeps preparation, apparatus, timing, calculation and review in one traceable route. UV absorbance, fluorescence or another detector has defined wavelength, path, response and sensitivity. Data rate and detector settings are controlled, and identity is not assigned from one migration time alone. Remember: Manual integration changes must remain visible and justified.
Try this
Audit the laboratory route for detection creates peaks from the migrating zones. Reassess detection creates peaks from the migrating zones after a capillary, coating, buffer, instrument, detector or software change. Mark every handoff where identity, contamination, time or units could be lost. Preserve this caution: Manual integration changes must remain visible and justified.
A strong science note separates observation from interpretation. Reassess detection creates peaks from the migrating zones after a capillary, coating, buffer, instrument, detector or software change. Record the source, version or date, population or device context, method, result and one uncertainty. If the official record does not show a field, write “not shown” instead of filling the gap from memory.
Evidence checkpoint
Reassess detection creates peaks from the migrating zones after a capillary, coating, buffer, instrument, detector or software change. Keep this boundary visible: Manual integration changes must remain visible and justified.
CHAPTER 13 OF 17 · Manage the analytical lifecycle
13. Migration-time markers improve run-to-run comparison
Internal standards, reference peaks or relative migration calculations can compensate for controlled variation. Marker suitability and peak identity are established, and unexpected order changes prompt investigation.
The scientific value of migration-time markers improve run-to-run comparison appears when the observation, method and quality decision remain connected. Internal standards, reference peaks or relative migration calculations can compensate for controlled variation. Marker suitability and peak identity are established, and unexpected order changes prompt investigation. Keep this boundary visible: Migration time alone does not establish molecular identity.
Try this
Build an evidence receipt for migration-time markers improve run-to-run comparison. Trace migration-time markers improve run-to-run comparison from capillary conditioning through injection, separation, detection and calculation. Add the source version, equipment identity and acceptance rule. Keep this limit: Migration time alone does not establish molecular identity.
A strong science note separates observation from interpretation. Trace migration-time markers improve run-to-run comparison from capillary conditioning through injection, separation, detection and calculation. Record the source, version or date, population or device context, method, result and one uncertainty. If the official record does not show a field, write “not shown” instead of filling the gap from memory.
Evidence checkpoint
Trace migration-time markers improve run-to-run comparison from capillary conditioning through injection, separation, detection and calculation. Keep this boundary visible: Migration time alone does not establish molecular identity.
CHAPTER 14 OF 17 · Manage the analytical lifecycle
14. System suitability proves that the run can answer its question
Resolution, migration-time precision, peak-area precision, tailing, current or reference pattern can serve as predefined checks. Suitability is evaluated before sample results are accepted.
For system suitability proves that the run can answer its question, a reliable result depends on both the material and the controlled measurement system. Resolution, migration-time precision, peak-area precision, tailing, current or reference pattern can serve as predefined checks. Suitability is evaluated before sample results are accepted. Preserve this guardrail: Electroosmotic flow and analyte mobility both shape observed order.
Try this
Challenge the assumptions behind system suitability proves that the run can answer its question. Challenge buffer, temperature, voltage, current, surface interaction and injection behind system suitability proves that the run can answer its question. Test one realistic failure mode and record what changes. Respect this boundary: Electroosmotic flow and analyte mobility both shape observed order.
A strong science note separates observation from interpretation. Challenge buffer, temperature, voltage, current, surface interaction and injection behind system suitability proves that the run can answer its question. Record the source, version or date, population or device context, method, result and one uncertainty. If the official record does not show a field, write “not shown” instead of filling the gap from memory.
Evidence checkpoint
Challenge buffer, temperature, voltage, current, surface interaction and injection behind system suitability proves that the run can answer its question. Keep this boundary visible: Electroosmotic flow and analyte mobility both shape observed order.
CHAPTER 15 OF 17 · Manage the analytical lifecycle
15. Peak integration needs transparent boundaries
Baseline choice, smoothing, valley rules and manual changes affect area and reported purity. Original data and audit trails remain available, and manual integrations are justified rather than used to improve appearance.
A trustworthy account of peak integration needs transparent boundaries keeps preparation, apparatus, timing, calculation and review in one traceable route. Baseline choice, smoothing, valley rules and manual changes affect area and reported purity. Original data and audit trails remain available, and manual integrations are justified rather than used to improve appearance. Remember: Injection mode can bias which species enter the capillary.
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Audit the laboratory route for peak integration needs transparent boundaries. Reconstruct peak integration needs transparent boundaries from raw electropherograms, audit trail, standards and suitability. Mark every handoff where identity, contamination, time or units could be lost. Preserve this caution: Injection mode can bias which species enter the capillary.
A strong science note separates observation from interpretation. Reconstruct peak integration needs transparent boundaries from raw electropherograms, audit trail, standards and suitability. Record the source, version or date, population or device context, method, result and one uncertainty. If the official record does not show a field, write “not shown” instead of filling the gap from memory.
Evidence checkpoint
Reconstruct peak integration needs transparent boundaries from raw electropherograms, audit trail, standards and suitability. Keep this boundary visible: Injection mode can bias which species enter the capillary.
CHAPTER 16 OF 17 · Manage the analytical lifecycle
16. Method changes can alter selectivity unexpectedly
Capillary lot, coating, buffer reagent, instrument, detector, software or conditioning sequence can shift mobility. Change control and comparative data show that the method continues to distinguish relevant species.
The scientific value of method changes can alter selectivity unexpectedly appears when the observation, method and quality decision remain connected. Capillary lot, coating, buffer reagent, instrument, detector, software or conditioning sequence can shift mobility. Change control and comparative data show that the method continues to distinguish relevant species. Keep this boundary visible: Manual integration changes must remain visible and justified.
Try this
Build an evidence receipt for method changes can alter selectivity unexpectedly. Reassess method changes can alter selectivity unexpectedly after a capillary, coating, buffer, instrument, detector or software change. Add the source version, equipment identity and acceptance rule. Keep this limit: Manual integration changes must remain visible and justified.
A strong science note separates observation from interpretation. Reassess method changes can alter selectivity unexpectedly after a capillary, coating, buffer, instrument, detector or software change. Record the source, version or date, population or device context, method, result and one uncertainty. If the official record does not show a field, write “not shown” instead of filling the gap from memory.
Evidence checkpoint
Reassess method changes can alter selectivity unexpectedly after a capillary, coating, buffer, instrument, detector or software change. Keep this boundary visible: Manual integration changes must remain visible and justified.
CHAPTER 17 OF 17 · Manage the analytical lifecycle
17. A complete Annex 11 receipt reconstructs each electropherogram
The record includes annex and chapter versions, purpose, product and batch, capillary type and dimensions, conditioning, buffer and pH, additives, sample preparation, injection, polarity, voltage, current, temperature, detector, standards, sequence, suitability, raw electropherograms, integration, calculations, deviations, investigation and approval.
For a complete annex 11 receipt reconstructs each electropherogram, a reliable result depends on both the material and the controlled measurement system. The record includes annex and chapter versions, purpose, product and batch, capillary type and dimensions, conditioning, buffer and pH, additives, sample preparation, injection, polarity, voltage, current, temperature, detector, standards, sequence, suitability, raw electropherograms, integration, calculations, deviations, investigation and approval. Preserve this guardrail: Migration time alone does not establish molecular identity.
Try this
Challenge the assumptions behind a complete annex 11 receipt reconstructs each electropherogram. Trace a complete annex 11 receipt reconstructs each electropherogram from capillary conditioning through injection, separation, detection and calculation. Test one realistic failure mode and record what changes. Respect this boundary: Migration time alone does not establish molecular identity.
A strong science note separates observation from interpretation. Trace a complete annex 11 receipt reconstructs each electropherogram from capillary conditioning through injection, separation, detection and calculation. Record the source, version or date, population or device context, method, result and one uncertainty. If the official record does not show a field, write “not shown” instead of filling the gap from memory.
Evidence checkpoint
Trace a complete annex 11 receipt reconstructs each electropherogram from capillary conditioning through injection, separation, detection and calculation. Keep this boundary visible: Migration time alone does not establish molecular identity.
Capillary-electrophoresis evidence map
| Question | Evidence to capture | Boundary to retain |
|---|---|---|
| What moves the analyte? | Charge, size and electric field | Define the separation mode |
| What moves the liquid? | Electroosmotic flow and capillary surface | Control conditioning and pH |
| What creates the signal? | Injection plug, detector and data rate | Protect peak shape and response |
| What supports the decision? | Standards, suitability and transparent integration | Stay within validated purpose |
Science learning becomes useful when a student can show where a claim came from, why it applies and where it stops. Continue with the eduKate Science Learning Hub, compare choices in the Education Hub, and connect these habits to career pathways built from subject capabilities.
Annex 11 shows how much science can happen in a tiny capillary. When flow, charge, heat, injection and detection are kept visible, a line of peaks becomes a trustworthy account of molecular differences rather than a pretty trace.
Primary sources and verification date
Source status checked 26 October 2026. FDA guidance describes the agency’s current thinking and does not replace applicable statutes, regulations or product-specific communication with FDA.
- FDA: Q4B Annex 11 Capillary Electrophoresis — Final guidance, September 2010; checked 26 October 2026.
- ICH: Quality Guidelines — Official Q4B annex index and harmonisation context.
- FDA: Q4B Core Guidance — Final Q4B process guidance, February 2008.