可抑制α-淀粉酶卵黄抗体的制备及其稳定性研究
首发时间:2019-01-15
摘要:制备可抑制α-淀粉酶卵黄抗体(A-IgY),分析其对α-淀粉酶活性的抑制效果,并对其稳定性进行研究。以α-淀粉酶为抗原,免疫海兰褐壳蛋鸡,水稀释和二次盐析法提取纯化IgY,SDS-PAGE和尺寸排阻色谱分析IgY的分子量和纯度,PAS法检测糖蛋白,Bernfeld法测IgY对α-淀粉酶的体外抑制效果。所得A-IgY的纯度为92.45%,属于糖蛋白,其重链和轻链分别在65 kDa和25 kDa处。首免后,A-IgY对α-淀粉酶的抑制率逐渐上升,第10周达到最大值(约98%),而后趋于稳定,对相同酶活力的人胰α-淀粉酶的抑制率为82.76%。A-IgY对猪胰α-淀粉酶的抑制率呈现剂量相关性,半抑制浓度(IC50)值为1.189 mg/mL。25~65℃或pH 4~12孵育30 min,A-IgY能保持较高的抑制活性;A-IgY经胃蛋白酶反应1min抑制率下降25%,2h内保持46%的抑制活性;A-IgY在胰蛋白酶液中孵育3 h能保持81%的抑制活性,8h时有66%的抑制活性。A-IgY可用作一种有效的新型、天然、安全的α-淀粉酶抑制剂,可为糖尿病防治的研究提供新思路。
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Preparation and stability of egg yolk immunoglobulin against α-amylase
Abstract:In this paper, the egg yolk immunoglobulin against α-amylase (A-IgY) was prepared and analyzed its stability. Hy-line lying hens were immunized with α-amylase, IgY was separated and purified from eggs by using water dilution and salting-out method. The molecular weight and purity of IgY were analyzed by SDS-PAGE and size-exclusion chromatography (SEC) respectively. The glycoprotein identified by periodic acid Schiff (PAS). The inhibitory activity against α-amylase of IgY was measured by Bernfeld method. The purity of A-IgY was 92.45%, which belonged to glycoprotein. The molecular weights of the heavychain and light chain of A-IgY were 65 kDa and 25 kDa respectively. The inhibition rate of A-IgY on α-amylase gradually increased and reached a maximum (about 98%) at the 10th week and then stabilized. The inhibition rate of IgY against human pancreatic α-amylase was 82.76%. The inhibition rate of IgY against porcine pancreatic α-amylase exhibited dose correlation and the semi-inhibitory concentration (IC50) value was 1.189mg/mL. A-IgY maintained its inhibitory activity when it was kept in 25~65 C or pH 4~12 for 30min. The inhibition rate decreased by 25% after A-IgY incubated with pepsin for 1 min and the inhibitory activity of A-IgY maintained 46% after 2 h. A-IgY maintained the inhibitory activity of 81 % after incubated with trypsin for 3h and kept at 66% after 8 h. A-IgY as an effective, new, natural and safe α-amylase inhibitor, which can be used in the prevention and treatment of diabetes.
Keywords: IgY α-amylase inhibition stability
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