Profile: Huzhou Xintiansi Bio-Tech Co, Ltd specializes in the research, development and manufacture of silkworm products. We are an ISO 9001 certified company. Our products include silk mixed amino acids, silk peptide, sericin powder, silk protein powder, high zinc protein powder and various other products. Silk mixed amino acid is a water soluble mixing amino acid obtained after hydrolysis of silk fibroin. The average molecular weight is about 90 and the product is also called as Silk 90. The product is a white powder with pH value between 5 and 7 & positive ninhydrin reaction. The silk amino acid is very easy to permeate the derma layer of skin and get absorbed, nurturing the skin as well. Due to its action in the enzyme metabolism, the silk amino acid can keep and adjust moisture, prevent skin from ultraviolet radiation, restrain splash generation, facilitate anti-aging for skin. Sericin powder is a kind of protein surrounding fibroin (silk protein), yellowy powder & soluble in water with pH value between 5 and 7 & positive ninhydrin reaction. Sericin protein can generate membrane on hair surface, which has nice luster, feels well & spring, and is also suitable for hair shaping. It can prevent chemicals adhering to hair and avoid the harms to hair too. Sericin has good ability of anti-oxidation and can restrain the activity of polyhphenol oxidase (PPO) in food. It is also a good natural anti-oxidant especially for rich grease food, cream and milk products. It is widely used in fiber coating, such as under-dress, bed sheet and leather, due to its skin caring, anti-microbe, & comfort effects.