Low molecular weight acetylhyaluronate, skin-softening composition,
method of manufacturing the same, and method of purifying the same
    31.
    发明授权
    Low molecular weight acetylhyaluronate, skin-softening composition, method of manufacturing the same, and method of purifying the same 失效
    低分子量乙酰透明质酸盐,皮肤软化组合物,其制造方法及其纯化方法

    公开(公告)号:US5679657A

    公开(公告)日:1997-10-21

    申请号:US624634

    申请日:1996-08-02

    摘要: Low molecular weight acetylhyaluronate has the following characteristics: intrinsic viscosity: 50 to 200 cm.sup.3 /g substitution degree of acetyl group: 2.6 to 3.6 (excluding N-acetyl group) A skin-softening composition is mainly composed of this low molecular weight acetylhyaluronate. It can exhibit excellent skin-softening effect and moisturizing effect, while appropriately suppressing the thread-forming ability inherent in hyaluronic acid. A method of manufacturing acetylhyaluronate comprises the steps of suspending hyaluronic acid powder in an acetic anhydride solvent and then adding concentrated sulfuric acid thereto to effect acetylation. A method of purifying acetylhyaluronate comprises the steps of adding raw acetylhyaluronate to an aqueous acetone solution, adding and dissolving sodium lactate therein, and then adding highly concentrated acetone thereto to precipitate highly pure acetylhyaluronate. Acetylhyaluronate having highly purity can be obtained inexpensively.

    摘要翻译: PCT No.PCT / JP95 / 01613 Sec。 371日期:1996年8月2日 102(e)日期1996年8月2日PCT提交1995年8月11日PCT公布。 公开号WO96 / 05233 日期:1996年2月22日低分子量乙酰透明质酸盐具有以下特征:特性粘度:50〜200cm 3 / g乙酰基取代度:2.6〜3.6(不含N-乙酰基)皮肤柔软性组合物主要由该低 分子量乙酰透明质酸盐。 它可以表现出优异的皮肤软化效果和保湿效果,同时适当地抑制透明质酸固有的丝线形成能力。 制造乙酰透明质酸盐的方法包括将透明质酸粉末悬浮于乙酸酐溶剂中,然后向其中加入浓硫酸进行乙酰化的步骤。 一种纯化乙酰透明质酸的方法包括以下步骤:向丙酮水溶液中加入原料乙酰透明质酸盐,加入乳酸钠溶解并溶解,然后加入高浓度的丙酮以沉淀出高纯度的乙酰基透明质酸盐。 可以廉价地获得高纯度的乙酰基乙酸酯。