共查询到20条相似文献,搜索用时 93 毫秒
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鸡肉酶解物-HVP-半胱氨酸Maillard反应体系产生肉香味化合物的研究 总被引:4,自引:0,他引:4
对鸡肉酶解物 HVP 半胱氨酸Maillard反应体系产生肉香味化合物进行了气 质联机 (GC MS)分析 ,从中分离、鉴定出了关键性肉味化合物如 2 甲基 3 呋喃硫醇、2 乙酰基呋喃、苯乙醛、3 甲基 2 噻吩醛、3 乙基 2 噻吩醛、双 (2 甲基 3 呋喃基 )二硫化物、二 (2 甲基 4,5 二氢 3 呋喃基 )二硫化物、2 糠硫醇、二 (2 糠基 )二硫化物、十六醛、十八醛等重要肉香味或鸡肉味化合物 ;而且这些化合物的含量相当高 ,证实了该Maillard反应模型系统组成的正确性 相似文献
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在L-抗坏血酸-L-脯氨酸/L-丙氨酸模型体系中研究了pH值对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值(pH=4.0、5.0、6.0、7.0、8.0)在140 ℃下加热搅拌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值的增大而增大,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。 相似文献
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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。 相似文献
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Yasutoshi Ito Manabu Kinoshita Tetsuo Yamamoto Tomohito Sato Takeyuki Obara Daizoh Saitoh Shuhji Seki Yukihiro Takahashi 《International journal of molecular sciences》2013,14(10):19618-19635
The development of an effective therapy for radiation-induced gastrointestinal damage is important, because it is currently a major complication of treatment and there are few effective therapies available. Although we have recently demonstrated that pretreatment with ascorbic acid attenuates lethal gastrointestinal damage in irradiated mice, more than half of mice eventually died, thus indicating that better approach was needed. We then investigated a more effective therapy for radiation-induced gastrointestinal damage. Mice receiving abdominal radiation at 13 Gy were orally administered ascorbic acid (250 mg/kg/day) for three days before radiation (pretreatment), one shot of engulfment (250 mg/kg) at 8 h before radiation, or were administered the agent for seven days after radiation (post-treatment). None of the control mice survived the abdominal radiation at 13 Gy due to severe gastrointestinal damage (without bone marrow damage). Neither pretreatment with ascorbic acid (20% survival), engulfment (20%), nor post-treatment (0%) was effective in irradiated mice. However, combination therapy using ascorbic acid, including pretreatment, engulfment and post-treatment, rescued all of the mice from lethal abdominal radiation, and was accompanied by remarkable improvements in the gastrointestinal damage (100% survival). Omitting post-treatment from the combination therapy with ascorbic acid markedly reduced the mouse survival (20% survival), suggesting the importance of post-treatment with ascorbic acid. Combination therapy with ascorbic acid may be a potent therapeutic tool for radiation-induced gastrointestinal damage. 相似文献
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For efficient removal of thiophenic sulfur (S-) compounds from oils, a novel method is proposed here, i.e. one-pot alkylation desulfurization (OADS), in which oil insoluble chlorinated polymer such as polyvinyl chlo- ride (PVC) is used as the alkylating regent with Lewis acid as catalyst. The aromatic S-compounds are grafted to the polymer through Friedel-Crafts reaction and removed facilely along with the polymer. The OADS mechanism is identified by scanning electron microscope and analyzer with surface area and pore size of the polymer. The influ- ence of some factors on the OADS is studied, e.g. the type and amount of chlorinated polymers and Lewis acids. It is nroved that thionhene and benzothioDhene can be removed efficiently from oil by PVC+AlCl3 mixture even in the presence of 25% (by mass) of benzene due to the synergetic effects of the adsorptive desulfurization of AlCl3 and the alkylation desulfurization of PVC. 相似文献
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用合成的Na2SeSO3和还原剂抗坏血酸在水溶液中反应12 h,合成直径为50 nm的硒纳米晶,利用X射线粉末衍射(XRD)和透射电子显微镜(TEM)对其结构进行了表征,介绍了生长机理. 相似文献
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从尿素合成塔内件和尿素合成工艺的发展及改进入手,详细论述了尿素合成塔内的反应过程。通过分析,得出了影响尿素合成塔内CO2转化率的主要因素。着重对UTI工艺的特点进行了剖析,指出了该工艺所体现出的较高优越性的核心所在。针对尿素合成塔内的混合问题,提出了新的思路,以期提高水溶液全循环法尿素生产工艺的水平。 相似文献
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对用脲硫酸溶液分解磷矿一步法制复混肥的工艺过程进行了系统研究.在脲硫酸复肥生产新工艺中,酸解剂配比、反应温度、磷矿粉细度、搅拌强度等工艺条件对磷矿分解率和气相氟逸出率均产生影响,其中酸解剂配比是最主要的影响因素.在酸解剂组成为尿素∶硫酸(物质的量比)=3.6∶1、反应温度为60~85 ℃、搅拌速率为400 r/min、磷矿粉细度-100目条件下,对不同品位的活性适中的磷矿,磷矿初期分解率可达80%以上,气相氟逸出率可降至10%以下,生产操作环境得以改善,氟污染处理费用可节约,是一种清洁型的磷复肥生产工艺. 相似文献
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系统论述了尿素合成过程的机理,详细讨论了尿素合成塔中的混合过程和反应过程,重点针对水溶液全循环法尿素合成工艺中存在的主要问题进行了客观评价,指出了目前普遍存在的工艺缺陷,给出了可行的解决方案。利用本文提出的"均相反应理论",有望对尿素合成的理念带来全新的认识,对于传统的工艺设计带来全新的改变,达到提高反应效率和节约能源的目的。 相似文献