7-Dehydrocholesterol(7-DHC) 7-Dehydrocholesterol(7-DHC)is an intermediate synthesized from Lanoline Cholesterol after acidylation,oxidation,hydrazone reaction and saponification.This world-leading technical process is initiated and development by our company with our own intellectual property. 2.Main specifications Items Specifications Ⅰ Ⅱ Appearance White crystalline powder Yellowy crystalline powder Specific Optical Rotation -108?#65374;-120?-105?#65374;-115? Absorption ≤0.15 ≤0.18 Loss on drying ≤7% ≤7% Assay ≥95%, 97% ≥90% 3.Analysis method of Assay HPLC.Mobile phase,n-hexane:dioxane:n-pentanol=445:45:10,Velocity,1.5ml/min.Wavelength,254nm. 4.Usage a.Important intermediate for synthesis of Vitamin D3.b.Additive for skin-care cosmetics ot prevent from UV radiation and skin disease. c.Lab-purpose reagent. 5.Packing Aluminum bags lined with food grade PE bags,packaged in paper cartons.The package size can be made as per customers' requirement. 6.Stability and storage Stored under dry,cool and dark condition and avoid moisture,water or heat.The shelf life is 6 months.