Contamination control
Contamination control: 5 articles from Peptides Info. Handling, storage and laboratory reference.
Sterile Filtration and the Bubble Point Test: What a 0.22 Micrometre Rating Claims
A sterilising rating is a bacterial retention claim validated against one organism, not a statement about hole size. Bubble point physics, wetting, adsorption by membrane material, capacity limits, and the contaminant filtration never removes.
Glassware Cleaning and Detergent Residue: Rinse Sequences and the Adsorption Penalty
Detergent residue survives a casual rinse and reappears as ion suppression, ghost peaks and failed assays. Rinse sequences, the final-rinse rule, when acid washing is warranted, and why scrupulously clean glass binds peptide harder than dirty glass did.
Water Grades Type I, II and III: Resistivity, TOC and Bacterial Limits
Laboratory water is specified by measured parameters, not by the process that made it. What each grade guarantees, how distillation, deionisation and reverse osmosis differ, and why water silently moves an analytical result.
Cross-Contamination Between Vials and Tools: Routes, Static and Detection
Carryover moves material between containers on spatulas, needles, gloves and shared surfaces — and, for lyophilised powder, without contact at all. The routes, the controls, the sequencing rule, and what detection can and cannot find afterwards.
Aseptic Technique at the Bench: Cabinets, Surfaces and Movement
Aseptic technique is a sequence of movements and surfaces, not a piece of equipment. Cabinet classes, disinfectant contact times, the errors that break first air, and what an open bench actually costs.