Poly-L-Ornithine comes with 100 mg of non-sterile powder. Poly-L-Ornithine is a synthetic amino acid chain that is positively charged and widely used as a coating to enhance cell attachment and adhesion to both plasticware and glass surfaces. The molecular weight of Poly-L-Ornithine can vary significantly with lower molecular weight (30,000 Da) being less viscous and higher molecular weight (>300,000 Da) having more binding sites per molecule. This product's molecular weight ranges from 70,000 to 150,000 Da. Poly-L-Ornithine is supplied in a 50 ml amber bottle. The product is ready-to-use after proper addition of cell culture water and sterile filtration.