Molecular Weight Concept and Silk Protein Powder Classification
Silk protein powder is a raw material primarily composed of silk fibroin derived from silkworm cocoons. Its "molecular weight" refers to the average relative molecular mass of the protein chains. Different molecular weights of silk protein powder result in differences in chain length, solubility, viscosity, and interaction with other formulation ingredients. Generally, silk protein powder can be categorized into high molecular weight, medium molecular weight, and low molecular weight grades. High molecular weight products are closer to the natural fibroin structure, while low molecular weight products dissolve more easily and exhibit better penetration and flow properties.
How Molecular Weight Affects Formulation Performance
In formulation development, molecular weight has a direct impact on product performance. High molecular weight silk protein powder has longer molecular chains, forming stronger molecular networks, which usually results in higher viscosity and improved film-forming ability. It is suitable for product systems that require stable structure or enhanced texture. Medium molecular weight silk protein powder offers a balance between viscosity and solubility, making it suitable for a wide range of common formulations. Low molecular weight silk protein powder has shorter chains, faster dissolution, and better flowability, making it ideal for applications requiring rapid dissolution, easy dispersion, and better compatibility with other ingredients.
Application Differences and Selection Recommendations
In practical applications, different molecular weights of silk protein powder correspond to different product positioning and usage scenarios. High molecular weight silk protein powder is more suitable for products emphasizing texture and structure, such as premium skincare, masks, creams, and formulas that require film formation. Medium molecular weight silk protein powder is more suitable for general formulations, such as daily personal care, hair care, or basic skincare products. Low molecular weight silk protein powder is more suitable for products emphasizing fast dissolution, light texture, or easy absorption, such as lightweight skincare, sprays, and some specialty formulations. Overall, selecting the appropriate molecular weight should be based on the final product's formulation structure, user experience, and target market requirements to achieve stable formulation performance and better product outcomes.