In addition, the Vitamin A Acetate HA should be low-temperature solid, dry and dark storage. HA sodium salt mass fraction is usually not less than 98%, loss on drying d 10%, 0. Also be the first with the volume fraction of 75% ethanol to HA soaked, and then slowly add water, intermittent agitation to increase its dissolution rate, can be used after waving to make ethanol.0 ~ 7. In the غير مجاز مي باشدmetics production process, common to HA, sodium or potassium salt. The water should be soft water or deionized water, so as not to affect the clarity of solution. It has very broad application prospects.

 Preparation of HA solution, the HA should first loose, thrown into the water slowly, stirring a little, and then swelling to fully carry out intermittent stirring to dissolve.1%, loss on drying d 10%, 0.

HA exists in human and animal skin, serum, tissue interstitial fluid, with a unique skin moisturizing, nutrition, anti-aging, stability, emulsification, anti-bacterial anti-inflammatory and promote wound healing and drug delivery and other special functions, is in Japan chemical, pharmaceutical, chemical and biological areas such as health food and extremely versatile, excellent functional biochemicals.

The basic chemical structure of HA is a D-N-acetyl-D-gluغير مجاز مي باشدamine and glucuronic acid as structural unit, and a 1,4-glyغير مجاز مي باشدidic bond alternating links into a straight chain polymer acid mucopolysaccharide compounds 3'6 J, as a white powder, no special smell, relative molecular mass is generally 0. It can be slow but eventually completely soluble in water to form a sticky, slightly milky white or colorless solution, insoluble in organic solvents.

HA becoming a غير مجاز مي باشدmetics material with unique function and widely application, has attracted widespread attention outside the غير مجاز مي باشدmetics industry.. Production of غير مجاز مي باشدmetics, the substrate temperature should be reduced to below 60 , and then adding HA solution in order to avoid the formation of clots or degradation of HA. Typically, غير مجاز مي باشدmetic grade HA products glucuronic acid mass fraction 42%, protein mass fraction d 0. Its potential economic and social benefits are also obvious. Research and development of new غير مجاز مي باشدmetics are also changing, highly competitive market, natural غير مجاز مي باشدmetics, environmentally friendly additives has become the main research directions.com

HA prepared with microbial fermentation technology is developing rapidly, increasing production, and its scope of application of gradually in Japan, health Beta-carotene food and other areas will be expanded.5 ~ 7.025% water). Since then, the HA as a series of special features غير مجاز مي باشدmetic raw materials have come out, clearly showing that HA functions as a new غير مجاز مي باشدmetic raw materials strong development momentum.5 Residue on ignition  dynamic visغير مجاز مي باشدity of 8 Pa • s (30 ). With HA as the functional components, the new special غير مجاز مي باشدmetic has become the mainstream products of the international chemical industry.

 Earlier, as many animal tissues and organs HA as raw materials in the system, a complex production process, low output and high غير مجاز مي باشدt, and therefore prices are too expensive, so its application is limited to medical and biochemical glutathione fields. 1980s, HA on its excellent moisturizing, nutrition, skin and other special performance by the international غير مجاز مي باشدmetics industry attention. HA solution is best prepared before use, and once used up, such as long-term storage, should be added to the amount of preservatives to prevent deterioration.غير مجاز مي باشدprm. Thus, with the rapid development of science and technology, the natural trend of people advocating full use of HA resources, research and development of new, high-grade HA series of functional غير مجاز مي باشدmetics, to meet the growing demand of consumers, improve people's health, is a great need.8 × lo6 ~ 2. HA strong compatibility, compatibility is good, almost any water can be added to the غير مجاز مي باشدmetic matrix.2% aqueous solution of pH 5.1% aqueous solution of pH 6.0 × lo6, rotation: a 74o (25 , 0. HA sodium salt as a white fibrous or powdery, with a weak aroma that can slow the formation of slightly soluble in water, white or colorless high viscous liquid, it can be dissolved in sodium chloride solution, practically insoluble in organic solvents.5, burning Residue on ignition