TG-DSC分析氯化钙抑制鱿鱼氧化三甲胺的热分解作用  

Inhibition Action of Calcium Chloride to Thermal Degradation of TMAO in Squid by TG-DSC Technique

作　　者：朱军莉[1] 苗林林[1] 李学鹏[2] 潘伟春[1] 励建荣[2] 

机构地区：[1]浙江工商大学食品与生物工程学院,杭州310035 [2]渤海大学辽宁省食品安全重点实验室,辽宁锦州121013

出　　处：《中国食品学报》2012年第12期148-154,共7页Journal of Chinese Institute Of Food Science and Technology

基　　金：国家自然科学基金项目(31000761);高等学校博士学科点基金项目(20113326130001);国家科技支撑计划(2012BAD29B06)

摘　　要：氧化三甲胺(TMAO)是鱿鱼制品中内源性甲醛(FA)形成的前体物质。为了研发鱿鱼高温甲醛的高效抑制剂,采用热重-差示扫描量热(TG-DSC)法探讨氯化钙抑制TMAO热分解生成FA和二甲胺(DMA)的反应机制。结果显示,氯化钙能显著抑制鱿鱼上清体系和TMAO-Fe(II)模拟体系中TMAO热分解生成FA、DMA和三甲胺(TMA),并能干扰亚铁离子对该分解反应的促进作用。在氯化钙作用下TMAO-Fe(II)体系中TMAO热分解的TG-DSC曲线出现明显变化,吸热分解峰由3个变为2个,分解温度均明显升高。热分解动力学研究表明,氯化钙使TMAO-Fe(II)中TMAO热分解的活化能从81.14kJ/mol显著上升到3259.78kJ/mol。氯化钙抑制鱿鱼上清中TMAO热分解反应的主要机制是:氯化钙提高了TMAO热分解的活化能。Trimethylamine oxide（TMAO） is as one of the principal precursors of dimethylamine（DMA） and formaldehyde（FA） in squid products.To research an efficient inhibitor of formaldehyde,the reaction mechanism of calcium chloride reducing thermal consersion of TMAO to FA and DMA in jumbo squid was assessed by TG-DSC technique.The results showed that calcium chloride inhibited significantly the conversion of TMAO to formaldehyde,DMA and timethylamine（TMA） both in the squid supernatant and TMAO-Fe（II）,and interfereed with stimulation of ferrous ions.The TG-DSC curves of degradation of TMAO were not similar between TMAO-Fe（II） and TMAO-Fe（II）-CaCl2 at the same thermal treatment.The number of degrading peak altered from three to two,and characteristic temperature of two peaks had rised significantly.The activation energy of TMAO thermal decomposition increased significantly from 81.14 kJ/mol to 3 259.78 kJ/mol.Thus,it was indicated that the inhibition of calcium chloride to thermal conversion of TMAO was mainly due to increasing activation energy of TMAO decomposition,which delayed the TMAO thermal decomposition reaction.

关 键 词：氧化三甲胺 氯化钙 热分解 甲醛 TG-DSC 

分 类 号：TS254.1[轻工技术与工程—水产品加工及贮藏工程]