Applications of γ-aminobutyric Acid in Functional Foods

γ-氨基丁酸(GABA)作为1种功能保健产品的原料,具有多种生理功效。综述了富含γ-氨基丁酸功能性食品的研究进展和应用现状,分析了目前应用中存在的问题,阐述了未来的研究方向。γ-aminobutyric acid(GABA)was a functional health products material with many physiological functions.The progress and applications of functional foods rich in GABA were reviewed.The problems and the development in the future were discussed.江西科技师范学院科研创新启动基金项目(2005

HPLC-MS/MS法测定四季感冒胶囊中的4种有效成分

建立了高效液相色谱-串联质谱联用法(HPLC-MS/MS)同时测定四季感冒胶囊中升麻苷、橙皮苷、5-O-甲基维斯阿米醇苷和连翘苷4种有效成分含量的方法.4种成分能很好地分离,各成分均有较宽的线性范围和良好的线性关系,回收率为98%~102%.该方法快捷、准确、重复性好,可为四季感冒胶囊的质量控制提供依据.广西民族大学2011年度一般项目(2011MDYB040

Microwave-assisted Extraction of Flavoniods from the Kummerowia striata （ Thunb. ） Schindl

[目的]优化鸡眼草中黄酮类化合物的提取条件。[方法]以鸡眼草的总黄酮提取率为评价指标,通过单因素试验对微波辅助提取鸡眼草黄酮类化合物的工艺条件进行了研究,再运用正交分析法确定最佳提取条件。[结果]微波辅助提取鸡眼草中的黄酮类物质的最佳条件为:乙醇浓度为50%、料液比1∶30(W/V,g/ml,下同)、微波功率300 W,微波处理时间25 min;在此条件下,鸡眼草的总黄酮提取率为3.28%。[结论]微波辅助提取鸡眼草中的黄酮类物质,操作简单易行,提取率较高,是一种理想的提取方法。[-Objectivei To study the optimal conditions for extracting total flavonoids from Kummerowia striata （Thunb）＇Schindl.. [Meth- od] The technological conditions of microwave-assisted extraction of flavoniods were investigated by the single factor and orthogonal experi- ments, and were assessed according to the extraction rate of tatol flavonoids. [ Result] The optimum conditions of microwave-assisted extrac- tion were 50% ethanol as solvent, 1：30 （ W/V, g/ml） of solid-liquid ratio, 300 W of microwave power and 25 min of microwave extraction time. Under the conditions, the extraction rate of total falconoid was 3.28%. [ Conclusion] The microwave-assisted extraction extracting fla- voniods in Kummerowia striata （Thunb.） Schindl. is a simple and ideal extraction method with high efficiency

Study on extraction and stability of the pigment

研究了密蒙花中天然黄色素提取的最佳工艺条件及其在不同条件下的稳定性。采用单因素和正交实验研究黄色素的最优提取工艺条件;分析其在不同p H值、温度、光线条件以及与常见金属离子、氧化剂、还原剂、糖等物质共存时黄色素的稳定性。结果表明,最佳的提取条件为:乙醇体积分数是60%,提取温度为60℃,提取时间为2.5 h,液料比为1∶50。密蒙花黄色素在p H2~8时较稳定,对高温比较敏感,在日光下较不稳定;对还原剂较敏感,有一定的抗氧化能力;对金属离子K+、Na+、Ca2+、Mg2+、Zn2+、Al3+、Cu2+比较稳定,对Fe3+和Pb2+不稳定;葡萄糖、蔗糖、麦芽糖、苯甲酸钠等常用食品添加剂对黄色素的稳定性无明显影响。可为密蒙花黄色素作为食用色素提供科学依据。ABSTＲACT The optimal condition for extraction pigment from Buddleja officinalis Maxim was obtained． And the stability of the pigment was studied． The optimum extraction conditions were: 60% ethanol，extraction temperature 60 ℃，extraction time 2． 5 hours，solid-liquid ratio 1∶ 50 ( g∶ mL) ． The results showed that the pigment from Buddleja officinalis Maxim was stable at pH 2 ～ 8，but was unstable to high temperature and sunlight． It was stable to H2O2 ， K + ，Na + ，Ca2 + ，Mg2 + ，Zn2 + ，Al3 + and Cu2 + ，but unstably to Na2SO3 ，Fe3 + and Pb2 + ． Glucose，sucrose，maltose and sodium benzoate had no effect on the stability of the pigment．国家民委科研项目(No.14GXZ012);广西自然科学基金(No.2013GXNSFBA019035);广西高校科学研究项目(No.YB2013075,YB2014100)资

一种适用于无人潜器的水下自锁机构

本发明涉及自锁机构，具体地说是一种适用于无人潜器的水下自锁机构，对接筒内部顶端设有对接弹簧，对接弹簧的下方设有固接于对接筒内壁上的封闭环套，封闭环套沿圆周方向均匀设有多组密封套，对接杆外表面的尾端沿圆周方向均匀设有与密封套数量相等、一一对应的锁紧销；每组密封套上均开设有滑道，滑道的起始端位于密封套的尾端，滑道的终止端与起始端之间在密封套的径向上具有间距，且滑道终止端朝向密封套尾端连通有锁紧槽，锁紧槽与滑道的终止端相连通。本发明可以有效锁紧对接的筒杆机构，利用弹簧和锁紧销进行自锁，仅需要前进的推力就可完成锁紧，具有方便快捷、稳定性强的优点

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies