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    • 10. 发明授权
    • Method of producing fractions containing a high concentration of milk basic cystatin and decomposition products thereof
    • 制备含有高浓度的乳碱性半胱氨酸蛋白酶抑制剂及其分解产物的级分的方法
    • US06649590B2
    • 2003-11-18
    • US09876267
    • 2001-06-06
    • Yukihiro TakadaAtsushi SerizawaYasuhiro MatsuokaYasuhiro TobaHiroshi Kawakami
    • Yukihiro TakadaAtsushi SerizawaYasuhiro MatsuokaYasuhiro TobaHiroshi Kawakami
    • A61K3800
    • A61K35/20A21D2/263A21D13/80A23C9/1307A23C19/082A23J1/20A23J3/08A23J3/343A23K20/147A23K20/174A23K20/22A23L33/19
    • A milk basic protein fraction is heated if necessary, the resulting precipitate is removed to recover the resulting supernatant, alcohol is added to this supernatant, a fraction containing a high concentration of milk basic cystatin is recovered by removing the resulting precipitate and brought into contact with a carrier containing a sulfuric acid group, such as heparin, to recover a fraction which is not adsorbed onto the carrier, and this fraction is then treated with an ultrafiltration membrane having an cut-off molecular weight of 10-50 kDa to recover the permeate to produce a fraction containing a high concentration of milk basic cystatin. Alternatively, a milk-derived basic protein composition is brought into contact with an anion exchange resin to recover a fraction which is not adsorbed onto the resin, after which this fraction is brought into contact with a cation exchange resin to recover the target fraction by eluting a fraction which is adsorbed onto the resin with an eluent to produce a fraction containing a high concentration of milk basic cystatin. Further, a decomposition product of the fraction containing a high concentration of milk basic cystatin is produced by decomposing this fraction containing a high concentration of milk basic cystatin with protease.
    • 如果需要,加热牛奶碱性蛋白质级分,除去所得沉淀物以回收所得上清液,向该上清液中加入醇,通过除去所得沉淀物并与之接触,回收含有高浓度的乳碱性半胱氨酸蛋白酶的级分 含有硫酸基的载体如肝素,以回收未吸附到载体上的级分,然后用截留分子量为10-50kDa的超滤膜处理该级分以回收渗透物 以产生含有高浓度的牛奶碱性半胱氨酸蛋白酶的部分。 或者,将乳衍生的碱性蛋白质组合物与阴离子交换树脂接触以回收未吸附到树脂上的级分,之后使该级分与阳离子交换树脂接触,以通过洗脱来回收目标级分 用洗脱液吸附到树脂上的一部分,以产生含有高浓度的乳碱性半胱氨酸蛋白酶的部分。 此外,含有高浓度的乳碱性半胱氨酸蛋白酶抑制剂的级分的分解产物是通过将含有高浓度的乳碱性半胱氨酸蛋白酶的部分用蛋白酶分解而产生的。