The volume of K0253 keratin derived from human epidermis is influenced by both the pack size and the lot-specific concentration. Here's a sample CofA for reference, which can be pulled from our website.
https://www.sigmaaldrich.com/certificates/sapfs/PROD/sap/certificate_pdfs/COFA/Q14/K0253-BULKSLCQ7891.pdf
Also, keratin can be used for fungal experimental studies, but the presence of urea in its preparation may pose a concern depending on the concentration used. Urea can be cytotoxic at higher concentrations, potentially affecting fungal growth and experimental outcomes. To mitigate this, researchers often dialyze or extensively wash keratin preparations to remove residual urea. It is advisable to test the cytotoxicity of the prepared keratin on fungal cells before proceeding with experiments. Alternative keratin extraction methods that avoid urea may also be considered if cell viability is a major concern.
K0253 is referenced in the study "Microbial Degradation of Native Keratin in Batch Fermentation".
https://scialert.net/fulltext/fulltextpdf.php?pdf=ansinet/pjbs/1999/627-634.pdf
