影响羊乳中环核苷酸质量浓度的化学因素

Research on Effects of Chemical Factors on Contents of Cyclic Nucleotides in Goat Milk

研究了pH、金属离子和抗氧化剂等化学因素对羊乳中环核苷酸质量浓度的影响。结果表明,羊乳中pH为3时cAMP质量浓度最高,pH为2时cGMP质量浓度最高;Ca^(2+)、Cu^(2+)、Fe^(2+)、Ni^(2+)、Mg^(2+)、Mn^(2+)、Zn^(2+)对羊乳中cAMP质量浓度有促进作用,而Cd^(2+)可降低羊乳中cAMP的质量浓度;Ca^(2+)、Co^(2+)、Mg^(2+)、Zn^(2+)对羊乳中cGMP质量浓度有促进作用,而Fe^(2+)、Ni^(2+)对羊乳中cGMP质量浓度有降低作用;在羊乳贮存2~4 d内抗氧化剂可降低羊乳中cAMP和cGMP的质量浓度,在4 d后可促进羊乳中cAMP和cGMP质量浓度。

Effects of chemicals, such as pH, metal ions and antioxidants, on the cyclic nucleotides content in goat milk were studied. The results showed that cyclic adenosine monophosphate （cAMP） got the highest concentration at pH 3,while highest concentration of cyclic guanosine monophosphate （cGMP） was achieved at pH 2. The content of cAMP in goat milk was increased by Ca2＋,Cu2＋,Fe2＋,Ni2＋,Mg2＋,Mn2＋ and Zn2＋,while decreased by Cd2＋. The addition of Ca2＋,Co2＋,Mg2＋ and Zn2＋ could improve cGMP content in goat milk,while Fe2＋ and Ni2＋ negatively affected cGMP content. The contents of cAMP and cGMP in goat milk was decreased by antioxidants during first 2？4 days,but improved after 4 days. This study could provide references for the development of functional goat milk products.