by maheshbhuva | Oct 9, 2026 | Analytical Chemistry, Pharmaceutical interview,, Quality control (QC)
Leveling Effect: Very weak basic drugs (e.g., diazepam, chlorpheniramine, ciprofloxacin) cannot be reliably titrated in water because water behaves as a stronger base than the analyte, causing poorly defined endpoints.Glacial Acetic Acid as Solvent: Glacial acetic... by maheshbhuva | Oct 3, 2026 | Analytical method development hplc,, Cleaning validation, Quality control (QC)
Product Quality Review (PQR / APQR) ​Answer: The PQR demonstrates the consistency of the commercial manufacturing process and the appropriateness of specifications. It must encompass: ​Review of raw materials and packaging materials (especially from new suppliers).... by maheshbhuva | Oct 2, 2026 | Analytical Chemistry, Pharmacopea, Quality control (QC)
Answer: A PQS establishes a state of control across the four product lifecycle stages (Development, Technology Transfer, Commercial Manufacturing, and Product Discontinuation). The four core enablers and management pillars are: ​Process Performance and Product Quality... by maheshbhuva | Sep 29, 2026 | Analytical Chemistry, Analytical method development hplc,, Cleaning validation, Quality control (QC)
HBEL stands for Health-Based Exposure Limit. It is a scientifically and toxicologically derived value that represents the maximum daily dose of a substance (typically an active pharmaceutical ingredient, intermediate, or cleaning agent) to which an individual can be... by maheshbhuva | Sep 19, 2026 | Analytical Chemistry, Out of specification, QMS, Quality control (QC)
Answer Framework: Phase I (Laboratory Investigation): Verify that the analyst followed standard test methods, instrument parameters were within calibration, solutions/standards were valid, and chromatograms/system suitability met criteria. Phase II (Manufacturing /... by maheshbhuva | Sep 19, 2026 | Analytical Chemistry, Out of specification, Pharmaceutical interview,, QMS, Quality control (QC)
Answer Framework: Phase I (Laboratory Investigation): Verify that the analyst followed standard test methods, instrument parameters were within calibration, solutions/standards were valid, and chromatograms/system suitability met criteria. ​Phase II (Manufacturing /...