Chemical Contamination from Residues (Cell Culture (Contamination))

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Accepted Answer

Poor cell growth, cell death, or altered cell behavior without visible microbial contamination. May include effects from free radicals, metal ions, disinfectant/detergent residues, or endotoxins persisting after bacterial contamination is cleared. Common causes: 1) Use of non-laboratory-grade water for preparing buffers and solutions 2) Inadequate rinsing of reusable labware leaving detergent residue 3) Autoclaving does not remove detergent residue from glassware 4) Endotoxins present in media, supplements, or serum without certification 5) Contaminated reagents or water used in media preparation 6) Equipment and supplies releasing chemical contaminants Solutions: 1) Always use laboratory-grade water for preparing buffers, solutions, and resuspending lyophilized reagents 2) Rinse all reusable labware exhaustively and allow to air-dry completely 3) Remember that autoclaving has no effect on detergent residue removal 4) Obtain media, supplements, and serum exclusively from suppliers providing endotoxin testing certification 5) Use high-quality, certified reagents from reputable suppliers 6) Implement quality control testing for chemical contaminants in prepared media