共查询到19条相似文献，搜索用时 93 毫秒
1.
魔芋精粉中甘露聚糖含量的测定 总被引：2，自引：0，他引：2
魔芋精粉是由鲜魔芋块茎，经过干燥、机械粉碎、风选等工序得到的一种初级产品。魔芋精粉主要成分为甘露聚糖，其次还有淀粉、纤维素、蛋白质。游离还原糖等。魔芋甘露聚糖是由甘露糖和葡萄糖，通过β-（1→4）苷键和β-（1→3）苷键连接而成的高分子多糖（分子量达106）［1］。研究证明，魔芋甘露聚糖具有减肥作用，对血清胆固醇、肝胆固醇和中性脂肪的上升有明显的抑制作用，并具有调节代谢正常化和增强免疫功能的作用，被广泛应用于保健食品和医药上［2］。甘露聚糖含量是魔芋精粉质量的一个关键指标。目前，生产中仅以粘度的高低判断甘… 相似文献
2.
从湖北省郧阳地区采集的绞股蓝全草中分离了一种新型的绞股蓝皂苷，经鉴定其结构为１９－羰基－２１，２３－环氧－３β，２０（Ｓ），２１（Ｒ）－三羟基达玛－２４－烯－３－氧－｛［α－吡喃鼠李糖基（１→２）］［β－吡喃葡萄糖基（１→３）］－α－Ｌ－吡喃阿拉伯糖苷｝。 相似文献
3.
苯甲酸对魔芋精粉化学改性的初步研究 总被引：8，自引：0，他引：8
经用苯甲酸对魔芋葡甘糖进行化学改性试验,所得的改性较条件为：苯甲酸与魔芋精粉的用量比（Ｗ／Ｗ）为０．６：１０．０;反应温度４５℃;反应时间３ｈ;ｐＨ值为４－５;烘干时间为６ｈ;干燥温度为５０℃。实验结果表明：魔芋葡甘聚糖经苯甲酸改性后,具有与用其他方法改性制品相似的性质, 相似文献
4.
5.
6.
7.
杨梅果核中油脂抗氧化成分的研究 总被引：13，自引：0，他引：13
从杨梅果核中首次分离得到了三个黄酮类化合物，经ＵＶ、ＩＲ、＾１ＨＭＲ、＾１３Ｃ ＮＭＲ、ＥＩ－ＭＳ和ＦＡＢ－ＭＳ等波谱分离，鉴定为槲皮素（１）、杨梅素（２）和槲皮素－３－Ｏ－α－Ｄ－吡喃葡萄糖－（６→１）－Ｏ－α－Ｌ－吡喃鼠李糖苷（３）。用Ｒａｎｃｉｍａｔ法测定了它们的抗氧化性能，表明三个化合物对油脂都是优良的抗氧化剂，尤其是槲皮素和杨梅素对于猪油的抗氧化性比合成抗氧化剂ＢＨＴ（３，５－二叔丁基－ 相似文献
8.
9.
10.
交联羧甲基魔芋葡甘聚糖微球的制备与表征 总被引：3，自引：0，他引：3
采用魔芋葡甘聚糖颗粒(KGG)在醇水溶液中合成了羧甲基魔芋葡甘聚糖微球(CMKGG)，进而合成了交联羧甲基魔芋葡甘聚糖微球(CCMKGG)，讨论了合成过程中的影响因素。通过应用正交设计的方法确定了碱用量为魔芋葡甘聚糖(KGM)量的20％，氯乙酸用量为KGM量的10倍，温度55℃，反应8h制得的羧甲基魔芋葡甘聚糖的羧甲基程度较好。交联产物具有较好的交换容量。红外光谱、光学显微镜和扫描电镜的结果表明，该颗粒为蜂窝状多孔微球，粒度均匀。经测试其阳离子交换容量为0．9538mmol／g，不溶于水，对酸、碱稳定。 相似文献
11.
12.
13.
利用热风干燥装置,在风温50～80℃,风速0.5m/s,厚5～12.5mm,面积78.5cm2的条件下,研究了风温、厚度对魔芋甘露聚糖干燥特性和效率的影响,提出了魔芋甘露聚糖热风干燥工艺。 相似文献
14.
15.
16.
17.
18.
《Scandinavian Journal of Forest Research》2012,27(5):427-435
In Scandinavia, moose (Alces alces L.) sometimes cause severe browsing damage to economically-important pine. Moose-vehicle accidents have spurred construction of fences along roads, and these may interfere with moose migration between summer and winter ranges, or the road alone may be a barrier. If this happens and moose build up along roads, landowners may suffer economically. Therefore, this study investigated whether roads, fences or other factors influence the use of young pine stands by moose. Eighty stands along roads in northern Sweden were evaluated in which individually-browsed branches were counted on 9972 pines. Moose browsing was not significantly related to birch (Betula pendula Roth, B. pubescens Ehrh.) density, nor did it differ between pines (Pinus contorta Douglas or P. sylvestris L.). However, increased pine density, site productivity and proximity to a highway were associated with increased browsing. Further large-scale studies are needed to understand moose habitat selection and the effects of roads. 相似文献
19.
《Scandinavian Journal of Forest Research》2012,27(3):206-217
The root systems of 2-yr-old Picea glauca, Picea mariana and Pinus banksiana seedlings were submitted to various frost temperatures during an artificial frost to induce different levels of root damage. Frost-damaged and control seedlings were placed in a greenhouse under high and low soil moisture regimes. Seedling growth and physiology were evaluated periodically. Seedling survival was reduced when root damage reached levels of 60-80%. Root systems of all three species showed partial to total recovery by the end of the experiment. In general, root freezing damage caused reductions in seedling growth, with these reductions becoming less significant over time. Root damage had little to no effect on black spruce and jack pine seedling physiology, while white spruce CO 2 uptake decreased with increasing root damage. Shoot nitrogen content of all three species decreased slightly with increasing root damage. 相似文献