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xiaoyi_yeah

银虫 (小有名气)

应助: 0 (幼儿园)
金币: 364.7
帖子: 185
在线: 20小时
虫号: 993105

[交流] 摘要一段

题目：Synthesis of γ-aminobutyric acid (GABA) by Lactobacillus plantarum DSM19463: functional grape must beverage and dermatological applications
摘要：Agriculture surplus were used as substrates to
synthesize γ-aminobutyric acid (GABA) by Lactobacillus
plantarum DSM19463 for the manufacture of a functional
beverage or as a novel application for dermatological
purposes. Dilution of the grape must to 1 or 4% (w/v) of
total carbohydrates favored higher cell yield and synthesis of
GABA with respect to whey milk. Optimal conditions for
synthesizing GABA in grape must were: initial pH 6.0,
initial cell density of Log 7.0 cfu/mL, and addition of
18.4 mM L-glutamate. L. plantarum DSM19463 synthesized
4.83 mM of GABA during fermentation at 30°C for 72 h.
The fermented grape must also contain various levels of
niacin, free minerals, and polyphenols, and Log 10.0 cfu/g of
viable cells of L. plantarum DSM19463. Freeze dried
preparation of grape must was applied to the SkinEthic®
Reconstructed Human Epidermis or multi-layer human skin
model (FT-skin tissue). The effect on transcriptional regulation
of human beta-defensin-2 (HBD-2), hyaluronan synthase
(HAS1), filaggrin (FGR), and involucrin genes was assayed
through RT-PCR. Compared to GABA used as pure chemical compound, the up-regulation HBD-2 was similar
while the effect on the expression of HAS1 and FGR genes
was higher.

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1楼 2010-11-19 23:16:36

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张军帅

木虫 (正式写手)

xiaoyi_yeah(金币+10, 翻译EPI+1): 2010-11-28 23:25:57

题目：：DSM19463乳酸乳杆菌合成的γ-氨基丁酸可以生产功能性葡萄汁饮料，也可用于皮肤疾病的治疗
摘要：农业产品葡萄的剩余，可作为DSM19463乳酸乳杆菌合成γ-氨基丁酸的底物以生产一种功能饮料来使用，或者被新颖的用于治疗皮肤科的疾病。该葡萄汁必须被稀释到总的碳水化合物的含量 1 or 4%(w/v)，γ-氨基丁酸关于乳清蛋白的合成。在葡萄汁里合成γ-氨基丁酸最优的条件是：初始的ph值为6，细胞浓度为Log7.0 cfu/mL,再添加18.4 mM L-谷氨酸。DSM19463乳酸乳杆菌 30°C 条件下发酵72小时可合成4.83 mM γ-氨基丁酸，已经发酵的葡萄汁也含有不同含量的烟酸、游离的矿物质、多酚以及含量为Log 10.0 cfu/g 的DSM19463乳酸乳杆菌的活细胞。冻干的葡萄汁也应用与人类再生上皮细胞以及人类的皮肤模型，人体防御素-2、透明质酸、丝聚蛋白以及包蛋白基因对转录的调节已经通过反转录酶-聚合链酶实验得到验证。它作为单纯的化合物，在上调人体防御素-2的作用上，冻干的葡萄汁跟γ-氨基丁酸比是相似的，然而在 HAS1 and FGR基因的表达上的作用上它则显得更强。

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