摘要
在L-抗坏血酸-L-脯氨酸/L-丙氨酸模型体系中研究了pH对Maillard反应产物的抗氧化活性的影响。Maillard反应产物通过控制不同初始pH(pH=4、5、6、7、8)于140℃加热搅拌2h的条件下制备,并以还原力、1,1-二苯基-2-苦基偕腙肼自由基(DPPH)清除能力和Fe2+螯合能力为指标对其产物抗氧化活性进行分析评价。结果表明,产物的还原力、DPPH自由基清除能力在pH=5时达到最大,Fe2+螯合能力随着pH的增大而增大,而且Maillard反应产物的还原力与在294nm处的紫外吸光度密切相关。
The objective of this investigation was to study the effect of pH on the antioxidative activity of Maillard reaction products（MRPs） from the L-ascorbic acid（ASA）-L-proline（Pro）/L-alanine（Ala） model systems.MRPs were prepared by heating the solution containing ASA and Pro/Ala adjusted to different pHs（4,5,6,7 and 8） at 140 ℃ for 2 h.The antioxidative activity of MRPs was evaluated by reducing the power of 1,1-diphenyl-2-picryl-hydrazyl（DPPH） radical-scavenging activity and the Fe2＋chelating activity.The results indicated that the reducing power and DPPH radical-scavenging activity reached a maximum with the initial pH=5.An increase in the Fe2＋ chelating activity of MRPs derived from the ASA-Pro/Ala model systems was observed as the initial pH increased.Moreover,the reducing power of MRPs was correlated well with the UV-absorbance at 294 nm.
出处
《精细化工》
EI
CAS
CSCD
北大核心
2010年第10期1016-1019,1034,共5页
Fine Chemicals
基金
国家自然科学基金资助项目(20876036)
湖北省高等学校优秀中青年科技创新团队计划项目(T200707)~~
