PureCol-S is a 3 mg/ml, type I bovine atelocollagen solution to use as a collagen standard. PureCol-S is known as the standard among collagen products for purity (>99.9% collagen content), consistency and reproducibility, and is cited in >2000 publications. PureCol-S collagen is provided as a standard for use in assays where ultra-pure collagen is required. PureCol-S collagen standard is approximately 97% Type I collagen with the remainder being comprised of Type III collagen. It contains a high monomer content as measured by gel permeation chromatography. The concentration is confirmed by Biuret protein determination assay. The concentration for each specific lot is provided on a Certificate of Analysis that is available with the purchase of each product. PureCol-S is soluble atelo-collagen in 0.01 N HCI, therefore, the pH is approximately 2.0. PureCol-S is sterile filtered and is supplied as a ready to use solution. Collagen Training Video: https://youtu.be/YcK2vUpNt0g