胰凝乳蛋白酶原 chymotrypsinogen 是胰凝乳蛋白酶的前體物質。牛的胰凝乳蛋白酶原A氨基酸殘基245個，分子量24500。
　 白色結晶或粉末。不含鹽，由牛胰中提取而得。每mg約含7000單位�？杀灰鹊鞍酌讣せ�，但不被胰凝乳蛋白酶激活。,生化研究�？�?jié)兯帯?br />Sigma相關產品資料：
Sigma C4879  α-Chymotrypsinogen A from bovine pancreas
Type II, essentially salt-free, lyophilized powder, ≥40 units/mg solid (after activation to α-chymotrypsin.)
CAS Number:9035-75-0
EC Number:232-905-3
MDL number:MFCD00130483
Description
Biochem/physiol Actions
 A serine protease that hydrolyzes peptide bonds with aromatic or large hydrophobic side chains (Tyr, Trp, Phe, Met) on the carboxyl end of the peptide bond.
Other Notes
View more information on chymotrypsin at Preparation Note
Derived from New Zealand-sourced pancreas.
Unit Definition
One unit will hydrolyze 1.0 μmole of BTEE per min at pH 7.8 at 25 °C.
性質
type:Type II
form:essentially salt-free, lyophilized powder
mol wt:mol wt 25,656 Da by calculation
purified by:6× crystallization
foreign activity:α-chymotrypsin ≤1 unit/mg (prior to activation by trypsin)
storage temp:−20°C