酸浆原汁中Vc稳定性的研究

本文研究了温度、pH值等因素对酸浆原汁中Vc稳定性的影响。结果表明:酸浆原汁中Vc在加热、与空气接触条件下不稳定、易损失,适当降低pH值以及添加适量蔗糖,对Vc具有保护作用。     

The effects of vitamin A nutritional status on microsomal lipid peroxidation and α-tocopherol level in rat liver

Summary In vitamin A-deficient rats, liver glutathione peroxidase activity was decreased, -tocopherol content was strongly enhanced, but microsomal liquid peroxidation remained unchanged.     

HPLC—ELSD法测定麦角固醇和光化学异构体

为测定麦角固醇和维生素D2及其他光化学异构体,研究确定了HPLC-ELSD测定的色谱分离条件:Kromasil C18柱(4.6×250 mm,5 μm),流动相为体积比95:5甲醇-水溶液,流速1.3 ml/min,蒸发光散射检测器漂移管温度为75℃,气体流量1.6 L/min.在此条件下,各组分得到有效地分离,麦角固醇和维生素D2色谱峰面积的自然对数与浓度的自然对数呈良好的线性关系(r>0.997),精密度RSD为1.89%～2.75%.最低检测限为0.05～0.1μg,回收率测定值为101.4%～102.8%.     

高效液相色谱法检测蜂花粉中总维生素C

为了得到一种效果较好的测定蜂花粉中总维生素C含量的方法,本文采用高效液相色谱法对油菜蜂花粉进行总VC的定性与定量分析,从结果的稳定性、精密度和重现性三方面对其进行了考量.结果发现,总VC含量在12.70～200.00μg范围内与色谱峰面积呈良好的线性关系,且回收率在95.71%～98.60%,相对标准偏差为1.05%;稳定性实验的相对标准偏差为2.12%,精密度实验的相对标准偏差为1.1%;最终测得油菜蜂花粉样品的总VC平均含量为36.99 mg.(100g)-1,相对标准偏差为1.43%.本研究所建立的HPLC测定蜂花粉中总VC含量的方法简单快速、重现性好,可以较为准确的实现定性与定量分析.     

关于中国古代的脚气病及其历史的研究

文章从作者的“亲身感受”，及当代国人多不识“脚气”为何，误将脚癣作脚气的现实状况，首先提出：“维生素Ｂ１缺乏症（脚气病），在中国的流行情况究竞如何”的问题。考察的结果是：只有在特殊时期、特殊生活环境、特殊人群中，才见此病较为广泛的流行。而在仅仅是以“白米为食”的生活环境下，并未见到此病的普遍存在，由此引出有关“中国古代医学文献中的脚气记载，其疾病的性质性质究竟如何”的思考。脚气病的基本病理的改变是     

分光光度法测定麦绿素中的维生素E

采用均匀设计法优化分光光度法测定麦绿素中维生素E的条件,建立了麦绿素维生素E质量分数测定方法,其方法的回收率为97.66%,检测限5.3354×10-6g/L。用该法测得自制麦绿素中维生素E的质量分数为0.118,RSD为4.464%。     

鳖饲料中维生素E的配伍研究

对鳖饲料中复合维生素和维生素E的科学配伍,进行了研究,结果表明在鳖饲料中VE最适量稚、幼鳖不小于150ppm,亲鳖大于500ppm;试验饲料的生物学综合评定结果提高了36.2%,饵料效率提高了10.9%.     

维生素C、刺梨汁对脂蛋白氧化修饰的抑制作用

观察了维生素Ｃ，刺梨汁和超氧化物歧化酶对体外Ｃｕ＾２＋氧化脂蛋白和低密度脂蛋白抑制作用。实验中采用硫代巴比妥酸活性物质实验和脂蛋白琼脂糖凝胶电泳法分别鉴定脂蛋白的脂质过氧化程度和负电荷的变化。结果表明，ＶｉｔＣ和刺梨汁可显著抑制Ｌｐ（ａ）和ＬＤＬ的氧化，在血浆生理ＶｉｔＣ浓度范围内，ＶｉｔＣ含量越高，则抗氧化能力越强。     

小白鼠饮食失节后糖皮质激素分泌功能的变化

因饮食失节而致脾虚的小白鼠,其血清皮质酮水平明显升高,肾上腺的维生素C含量显著下降,而肾上腺指数呈相应增加;且所有这些症状均是暂时的,可逆的.四君子汤可使症状完全消失.     

Role of 1,25-dihydroxyvitamin D3 in the generation of the acute-phase response in rats with talc-induced granulomatosis

Subcutaneous injection of nonspecific irritants such as magnesium silicate (talc) provokes granulomatous inflammation in the rat. Part of the acute phase response (APR) in these animals is the loss of trabecular bone at sites distant from the site of inflammation. To assess the possible involvement of vitamin D in the bone loss, we studied the development of the acute phase response in vitamin D-deprived rats. The serum APR provoked by subcutaneous inflammation in rachitic rats consisted of hypozincemia, hypercupremia, increased, alkaline phosphatase activity and adrenocorticotropic hormone (ACTH) concentration, and was similar to that in control animals except for the absence of hypoferremia. Control rats with talc-induced subcutaneous inflammation also had splenomegaly and decreased total and mononuclear peripheral blood cell counts, while subcutaneous inflammation did not induce spleen changes in rachitic rats. Subcutaneous inflammation induced the loss of trabecular bone and decreased the osteoblastic cell count in tibial metaphyses in control animals. Rachitic rats had abundant osteoid on trabecular surfaces, and the number of osteoblasts and osteoclasts was comparable to that of the controls. Subcutaneous inflammation did not affect any of the bone parameters in rachitic rats. These results indicate that vitamin D plays an important role in the generation of the acute phase response during inflammation, particularly in the induction of spleen and bone cell changes. The discrepancy of the blood on one hand and bone and spleen indices of the APR on the other, indicate that there may be divergent pathways in the generation of the inflammatory response, some of which may be dependent on vitamin D.