Studies on Purification of Methamidophos Monoclonal Antibodies and Comparative Immunoactivity of Purified Antibodies

To purify Methamidophos (Met) monoclonal antibodies with two methods and compare immune activity of purified antibodies. Method Caprylic acid ammonium sulphate precipition (CAASP) method and Sepharose protein-A (SPA) affinity chromatography method were used to purify Met monoclonal antibodies, UV spectrum scanning was used to determine protein content and recovery of purified antibodies, sodium dodecylsulphate polyacrylamide gel electrophoresis (SDS-PAGE) was used to analyze the purity of purified antibodies, and enzyme-linked immunosorbent assay (ELISA) was used to determine immune activity of purified antibodies. Results Antibody protein content and recovery rate with CAASP method were 7.62 mg/mL and 8.05% respectively, antibody protein content and recovery rate with SPA method were 6.45 mg/mL and 5.52% respectively. Purity of antibodies purified by SPA method was higher than that by CAASP method. The half-maximal inhibition concentration (IC50) of antibodies purified by SPA to Met was 181.26 靏/mL, and the linear working range and the limit of quantification (LOD) were 2.43-3896.01 靏/mL and 1.03 靏/mL, respectively. The IC50 of antibodies purified by CAASP to Met was 352.82 靏/mL, and the linear working range and LOD were 10.91-11412.29 靏/mL and 3.42 靏/mL, respectively. Conclusion Antibodies purified by SPA method are better than those by CAASP method, and Met monoclonal antibodies purified by SPA method can be used to prepare gold-labelled testing paper for analyzing Met residue in vegetable and drink water.

Synthesis and Biological Activity of N-Acetylmuramyl-L-Valyl-D-Glutamic Acid α-n-Butyl Ester

本文报道用Ｎ－羟基琥珀酰亚胺（ＨＯＳＵ）活化酯方法从Ｎ－乙酰氨基葡萄糖、Ｌ－缬氨酸和Ｄ－谷氨酸出发，合成免疫促进剂—Ｎ－乙酰胞壁酰－Ｌ－缬氨酰－Ｄ－谷氨酸－α－正丁酯，测定分析了产物和中间体的光谱特征，并用小鼠碳廓清率、巨噬细胞溶菌酶、酸性磷酸酶和血清溶菌酶等指标，初步评价了产物的免疫活性，结果表明，该化合物能有效地激活巨噬细胞，具有较强的免疫促进作用。