by maheshbhuva | Apr 30, 2025 | Analytical Chemistry, Quality control (QC), stability, wet lab
1. Charging Samples to a Stability Study (Initiation):In the pharmaceutical industry, “charging” samples to a stability study refers to the process of formally placing representative samples of a drug substance or drug product into controlled storage...
by maheshbhuva | Apr 27, 2025 | Analytical Chemistry, Heavy metal, Quality control (QC)
Method B in heavy metal testing is used for substances that do not yield clear, colorless solutions when tested under Method A. It involves reacting the sample with hydrogen sulfide or sodium sulfide to form colored metal sulfides, which are then compared to a...
by maheshbhuva | Apr 26, 2025 | Analytical Chemistry, Analytical method development hplc,, Quality control (QC)
heavy metals in a substance. It involves reacting the substance with hydrogen sulfide (or sodium sulfide) to produce colored heavy metal sulfides, which are then compared to a standard lead solution. The test ensures that the sample does not exceed a specified heavy...
by maheshbhuva | Apr 25, 2025 | Analytical Chemistry, Analytical method development hplc,, Heavy metal, Quality control (QC)
measures the fluorescence emitted by atoms in a sample excited by a light source. X-ray Absorption Spectroscopy (XAS): XAS provides information about the chemical form of heavy metals in a sample. Sample Preparation:Before analysis, samples (e.g., soil, water,...
by maheshbhuva | Apr 24, 2025 | Analytical Chemistry, Hplc
HPLC (High-Performance Liquid Chromatography) pump issues can significantly impact the performance and reliability of your chromatographic analysis. Here are some common problems and potential solutions: Common Issues: Flow rate inconsistencies: Variations in flow...
