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作 者:罗舜菁[1] 钟寒燕[1] 刘成梅[1] 陈婷婷[1] 陈发荣[1] 严杰琳[1]
机构地区:[1]南昌大学食品科学与技术国家重点实验室,江西南昌330047
出 处:《食品科学》2010年第10期91-94,共4页Food Science
基 金:江西省教育厅科学技术研究项目(GJJ09062)
摘 要:采用混合酸酐法合成30:1~10:1三个不同起始物质的量比的氯霉素免疫抗原(HAP-KLH),采用活泼酯法(EDC-NHS)合成40:1~1:1七个不同起始物质的量比的包被抗原(HAP-OVA),紫外测定HAP-KLH偶联比25:1~8:1,HAP-OVA偶联比23:1~1:3。间接竞争ELISA实验优化包被抗原,在23:1~3:1偶联比范围内,氯霉素(CAP)IC50值为36~15ng/mL,随着偶联比的减小而降低,当偶联比低于3:1则略为上升。确定了包被抗原HAP-OVA最佳偶联比为3:1。本研究表明包被抗原的偶联比对ELISA测定IC50值有重要影响,应合成不同偶联比的包被抗原,选出最佳偶联比。Chloramphenicolsuccinate and keyhole limpet hemocyanin (KLH) were mixed at 3 initial molar ratios, namely 30:1, 20:1 and 10:1, to synthesize chloramphenicol (CAP) immunogens (hapten-KLH conjugates) with coupling ratios of 25:1, 16:1 and 8:1, respectively. Additionally, chloramphenicolsuccinate was mixed with ovalbumin (OVA) at 7 initial molar ratios, namely 40:1, 30:1, 20:1, 10:1, 7:1, 4:1 and 1:1, to synthesize CAP coating antigens (hapten-OVA conjugates) with coupling ratios determined by the UV spectrometric method of 23:1, 20:1, 14:1, 6:1, 3:1, 1:1 and 1:3, respectively. Indirect competitive enzyme linked immunosorbent assay (ic-ELISA) experiments were carried out to choose a CAP coating antigen with an optimal coupling ratio. CAP was determined with the CAP coating antigens to have IC50 values ranging from 15 to 36 ng/mL. As the coupling ratio between chloramphenicolsuccinate and OVA decreased from 26:1 to 3:1, there was a decrease in the IC50 value of CAP. When the coupling ratio was less than 3:1, the IC50 value of CAP exhibited a slight increase. These findings demonstrate that a CAP coating antigen with an optimal coupling ratio should be synthesized for the ic-ELISA assay of IC50 significantly influenced by coupling ratio.
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