共查询到20条相似文献,搜索用时 31 毫秒
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徐柏森 《中国野生植物资源》1999,18(1):18-19
本文采用恒温干燥的方法制备出了不同状态的天然色素扫描电镜样品,用扫描电镜观察其超微结构并进行了对应比较,结果表明国内研制的β胡萝卜色素纯度较高,具有良好的开拓前景。 相似文献
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羊奶果果实色素的初步鉴定 总被引:1,自引:0,他引:1
通过理化性质和光谱分析,研究了羊奶果果实色素的稳定性,并初步鉴定出羊奶果果实色素为脂溶性的类胡萝卜素,以石油醚-丙酮-苯(2∶0.5∶2,V/V)为展开剂,纤维素硅胶G薄层层析得7条色素带,其中最大量的色素带经紫外-可见及红外光谱分析鉴定为γ-胡萝卜素。 相似文献
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光合细菌H3菌株色素分析 总被引:2,自引:1,他引:2
H3菌株系由盐田微生物层中分离获得的光合细菌株。具有丰富的天然色素。经活细胞色素光谱吸收峰值测定,色素经有机溶剂提取、硅胶薄板层析、SDS-PAGE电泳等,结果表明H3菌株的主要色素包括细菌叶绿素a、细菌脱镁叶绿素(Bacteriophaeophytin)和三种类胡萝卜素。总胡萝卜素含量占细胞于重的0.6%,胡萝卜素蛋白复合体的分子量约11,000.培养条件的差异对色素形成及相对含量有不同程度的影响。 相似文献
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利用盐藻(Dunaliella)培养生产β—胡萝卜素 总被引:12,自引:0,他引:12
盐藻是一种高含β-胡萝卜素的广盐性微藻。本文介绍了β-胡萝卜的功能、生产方法、协菏的生物学特征,研究了利用盐藻生产β-胡萝卜素的优化工艺条件和新型光生物反应器的开发应用。 相似文献
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由于消费者需要安全性、天然性、健康性食品的呼声越来越高,作为重要的一类食品添加剂——食用天然色素在日本受到了应有的重视。自1975年以来,日本开始以天然色素逐步地取代过去普遍使用的合成食用色素。目前在研究、开发和应用天然色素方面,日本均处于世界各国的先进水平。尽管天然色素普遍存在着纯度不 相似文献
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采用日立835-50型氨基酸分析仪,测定了发酵法生产的β-胡萝卜素菌丝体及提取β-胡萝卜素后剩余的菌渣中氨基酸含量,结果表明:在氨基酸总含量中,必需氨基酸含量较高;在β-胡萝卜菌丝体、菌渣中、赖氨酸含量较高,谷氨酸含量最高。 相似文献
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提高红酵母胡萝卜素发酵产率的研究 总被引:3,自引:0,他引:3
以红酵母RY-998为实验菌株,采用液体摇瓶发酵方式,在培养基中加入氟化铵等6种添加物,研究它们对红酵母和长及胡萝卜素合成的影响。结果表明;除植酸和二甲基亚砜外,氟化铵,醋酸铵,L-亮氨酸和L-缬氨酸对红酵母胡萝卜素产率均有明显的提高作用;当同时添加氟化铵15mg/L,醋酸铵20mg/L,L-亮氨酸40mg/L和L-缬氨酸30mg/L时,细胞生物量,胡萝卜素含量和产率可分别比对照组提高42.2%,55.4%和121.2%。 相似文献
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紫蓝红色素的研究进展 总被引:5,自引:0,他引:5
紫蓝红色素是一种有很大推广价值的天然色素。原料易栽培,见效快,色素年产量可达2.7t/hm^2,E1%1cm〉13,关键在于水管理。色素具有醌类特性,热稳定性高,100℃加热2h,PH3-8下残存88%以上,热降解符合一级反应动力学,光稳定性也较高,酸性溶液于自然光下93天的残存率为69.6%;Mg^2+、Zn^2+、Ca^2+、盐、糖、淀粉、琼脂、明胶、苯内等无不良影响。用于酒类、饮料、冷饮、大 相似文献
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Shuang Liu Feng-Qin Dong Chong-Qin Tang Ting-Yun Kuang Liang-Bi Li Yu-Long Liu 《植物学报(英文版)》2006,48(7):800-806
Strong light (800μmol photons/m^2 per s)-induced bleaching of the pigment in the isolated photosystem Ⅱ reaction center (PSII RC) under aerobic conditions (in the absence of electron donors or acceptors) was studied using high-pressure liquid chromatography (HPLC), absorption spectra, 77K fluorescence spectra and resonance Raman spectra. Changes in pigment composition of the PSII RC as determined by HPLC after light treatment were as follows: with Increasing illumination time chlorophyll (Chl) a and β-carotene (β-car) content decreased. However, decreases in pheophytin (Pheo) could not be observed because of the mixture of the Pheo formed by degraded chlorophyll possibly. On the basis of absorption spectra, it was determined that, with a short time of illuminatlon, the initial bleaching occurred maximally at 680 nm but that with Increasing Illumination time there was a blue shift to 678 nm. It was suggested that P680 was destroyed Initially, followed by the accessory chlorophyll. The activity of P680 was almost lost after 10 mln light treatment. Moreover, the bleaching of Pheo and β-car was observed at the beginning of illumination. After Illumination, the fluorescence emission Intensity changed and the fluorescence maximum blue shifted, showing that energy transfer was disturbed. Resonance Raman spectra of the PSII RC excited at 488.0 and 514.5 nm showed four main bands, peaking at 1 527 cm^-1 (υ101), 1 159 cm^-1 (υ2), 1 006 cm^-1 (υ3), 966 cm^-1 (υ4) for 488.0 nm excitation and 1 525 cm^-1 (υ1), 1 159 cm^-1 (υ2), 1 007 cm^-1 (υ3), 968 cm^-1 (υ4) for 514.5 nm excitation. It was confirmed that two spectroscopically different β-car molecules exist In the PSII RC. After light treatment for 20 mln, band positions and bandwidths were unchanged. This indicates that carotenoid configuration Is not the parameter that regulates photoprotectlon in the PSII RC. 相似文献
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