植酸在金属防护中的应用

植酸是一种少见的多齿金属螯合剂，因其特有的功能及天然无毒特性，目前在日本等发达国家普遍应用。本文通过对植酸的结构分析，阐述了在植酸在金属防护处理中的作用及特殊功能，综述了国内外植酸的研究及应用成果。     

植酸在金属防护中的应用

植酸是一种少见的多齿金属螯合剂,因其特有的功能及天然无毒特性,目前在日本等发达国家普遍应用。本文通过对植酸的结构分析,阐述了植酸在金属防护处理中的作用及特殊功能,综述了国内外植酸的研究及应用成果     

无毒植酸在金属防护中的应用

植酸由于其独特的分子结构、理化性及天然无毒性,在发达国家得到广泛应用。介绍了植酸的分子结构,概述了其在金属防护中的应用。     

植酸在金属防护中的应用新进展

植酸是一种新型金属多齿螯合剂 ,可在金属表面形成一层致密的单分子有机保护膜 ,从而防止金属的腐蚀。介绍了植酸在金属防腐、磷化和钝化等工艺中的应用。     

植酸在金属防腐中应用的新进展

介绍了植酸在金属防腐、磷化、钝化等工艺中的最新应用实例及防腐效果.     

植酸在金属防腐中应用的新进展

介绍了植酸在金属防腐、磷化、钝等工艺中的的最新的应用实例及防腐效果。     

植酸在金属防护中的应用进展

植酸是一种新型金属多齿螯合剂，可在金属表面形成一层致密的单分子有机保护膜，从而防止金属的腐蚀。介绍了植酸在金属防腐、磷化和钝化等工艺中的应用。     

植酸在金属防腐中的应用研究

用失重法研究了植酸对金属的阻蚀性。分别以0.1 mol/L HCl、0.1 mol/L NaCl或0.1 mol/L NaOH为介质,配置不同植酸浓度的(空白自来水,0.5%,1%,1.5%,2%)溶液,并与相同介质下1.5%亚硝酸钠或1.5%磷酸二氢锌的溶液相比较。实验表明,对于铝、锌和铁三种金属,植酸对铝的防腐率最为显著,其中尤以植酸在NaCl介质中对铝的防腐性能最优,最佳防腐浓度为0.5%;对于锌、铁,防腐作用最佳的是空白自来水介质的1.5%磷酸二氢锌钝化液。     

植酸的应用研究进展

植酸因其特殊的结构及化学性质广泛应用于食品工业、医药、日用化工及金属防腐等领域。本文综述了植酸的应用研究进展,重点探讨了近年来的研究热点,展望了今后的发展趋势。     

植酸在金属表面处理中的应用

植酸亦称环己六醇六磷酸脂 ,是从粮食作物中提取的天然无毒化工产品 ,植酸特殊的分子结构及理化性能 ,决定了其在金属表面处理中的重要应用价值。尤其是在环境保护日益强化的今天 ,植酸产品在金属表面处理中必将占有极其重要的位置。1　植酸的防护机理植酸分子量为 6 6 0 ,分子式为Ｃ6 Ｈ18Ｏ2 4 Ｐ6 。植酸分子中含有六个磷酸基 ,故易溶于水 ,具有较强的酸性。植酸分子中具有能同金属配合的 2 4个氧原子、12个羟基和 6个磷酸基。因此 ,植酸是一种少见的金属多齿螯合剂。当与金属络合时 ,易形成多个螯合环 ,所形成的络合物稳定性极强 ,即使…     

Effects of Phytic Acid and Xanthotoxin on Growth and Detoxification in Caterpillars

Phytic acid is abundant in the fruits and seeds of many plants and is found in foliage to a lesser extent. Among its several properties, phytic acid is a potent chelator of essential minerals and proteins; thus, the possibility exists that heme-based enzymes such as cytochrome P450 monooxygenases in herbivores are detrimentally affected by phytic acid via chelation of dietary iron. Mortality, growth performance, and P450-mediated metabolism of xanthotoxin, a plant allelochemical, were examined in the presence of phytic acid in three lepidopteran species: a polyphagous seed-feeding species (Heliothis virescens), a polyphagous foliage-feeding species (Trichoplusia ni), and a species oligophagous on immature reproductive structures of two genera of Apiaceae (Depressaria pastinacella). While first instar H. virescens experienced no increase in mortality after 120 hours on a diet containing 1% phytic acid compared to a control diet, both T. ni and D. pastinacella experienced virtually complete mortality over the same time period. Ultimate instars of all three species experienced reductions in relative growth rates (RGR) and relative consumption rates (RCR) in the presence of phytic acid, although the only species to experience reduced digestive efficiency (ECI) was H. virescens. Cytochrome P450-mediated metabolism of xanthotoxin was reduced 60% in the presence of phytic acid in D. pastinacella, although metabolism remained unaffected in the two noctuids. These studies suggest a defensive function of phytic acid in addition to its primary functions of phosphorus storage, energy storage, and cell wall precursor source.     

Evaluation of Simple and Inexpensive High-Throughput Methods for Phytic Acid Determination

High‐throughput/low‐cost/low‐tech methods for phytic acid determination that are sufficiently accurate and reproducible would be of value in plant genetics, crop breeding and in the food and feed industries. Variants of two candidate methods, those described by Vaintraub and Lapteva (Anal Biochem 175:227–24, 1988 ; “VL” methods) and Huang and Lantzsch (J Sci Food Agric 34:1423–1426, 1983 ; “HL” methods), were evaluated. The primary concern with these methods is that, due to interference of matrix constituents including inorganic P, they can overestimate phytic acid and are ineffective at low levels of phytic acid. Twelve seed flours, representing lines of soybean, maize, barley and dry bean, containing a wide range of phytic acid levels, were analyzed by a minimum of eight cooperating laboratories using three variants of the VL method and two variants of the HL method. No method had consistently acceptable (?2.0”) “Horwitz ratios”, a measure of reproducibility, although some treatments approached that. For example, one variant of the VL method when used to assay a soybean flour with a “standard” level of phytic acid had a Horwitz ratio of 2.15. Some variants of the VL method were adequate for analyses of cereal grains regardless of phytic acid level but none accurately measured phytic acid when at low levels in soybean flours. One variant of the HL method in which the 0.2 N HCl extraction media is modified to contain 10% Na₂SO₄, did accurately measure phytic acid levels in both cereal and legume flours regardless of endogenous phytic acid levels or matrix constituents.     

米糠制植酸的工艺研究和进展

植酸是一种价格昂贵、用途极广的精细化学品。目前我国的植酸产品绝大部分属于中低档产品,另一方面,食品、日化、医药等行业对高纯度的植酸产品的需求日渐升温,我们应该大力发展植酸生产,加快产品的升级换代。生产植酸的方法有3种,目前仍以溶剂萃取法为主,对此法的生产和研发重点做了论述,指出了植酸以后生产研发的方向。     

植酸的制备工艺及其应用

对植酸的制备工艺进行了阐述,并探讨了植酸在食品、医药、日用化工等方面的应用。     

植酸的生产及应用开发

综述了植酸产品的应用及国内植酸生产工艺的研究开发;分析了植酸产品的市场开发前景。     

植酸稳定双氧水的实验研究

用植酸与焦磷酸钠、酒石酸做稳定双氧水的对照实验，结果证明，植酸作双氧水的稳定剂效果显著，具有较大的推广应用价值。     

植酸改性的明胶复合膜制备及其结构与性能分析

采用溶液共混法,通过添加不同比例的植酸探索制备植酸/明胶复合膜,测试不同植酸含量对复合膜的结晶结构、微观形貌、透明度、溶胀性和机械强度的影响,进而分析探究植酸对明胶膜的结构调控和性能改善作用。结果表明,与纯明胶膜相比,植酸对明胶有明显的交联改性作用,复合膜具有致密均一的内部结构,植酸通过极性基团的相互作用抑制了明胶的自结晶行为,使复合膜结晶度降低。随着植酸含量的增加,复合膜的可见光透过率下降,溶胀率变化表明植酸与明胶的结构重组能有效阻隔水分子的渗透。复合膜力学强度随着植酸的加入呈上升趋势,当植酸质量分数达10%时,植酸/明胶复合膜拉伸强度约为61.57MPa,较纯明胶的拉伸强度（50MPa）提高了约20%,但对断裂伸长率无明显作用。     

镁合金化学镀镍前植酸活化工艺

通过植酸活化可提高AZ31镁合金化学镀层的耐蚀性能。采用正交试验优化植酸活化工艺,利用金相显微镜观察了植酸膜的微观形貌,测定了植酸膜在质量分数为3.5%的NaCl溶液中的极化曲线及在化学镀镍液中的开路电位。结果表明,当植酸质量浓度为20g/L、温度为50°C、pH=8时处理25min,植酸膜具有良好的耐蚀性能,并且能够作为化学镀的活化层。     

Determination of the Phytic Acid and Sinapic Acid Esters in Seeds of Rapeseed and Selection of Genotypes with Reduced Concentrations of these Compounds

A photometric procedure is described which allows the fast determination of the concentrations of sinapic acid esters and phytic acid in seeds of rape. The method is based on the yellow colour of the esters in alkaline media and the weakening of the intensity of the red coloured Fe-sulfosalicylic acid complex in the presence of phytic acid. By means of biogenetic pathways locations of genetic blocks are discussed which can be expected or which are desired in breeding materials.     

由脱脂米糠浸泡液制备植酸钠工艺

开发了用离子交换树脂吸附法以脱脂米糠浸泡液为原料生产植酸的新工艺，采用正交设计及极差分析法确定了最佳工艺条件，植酸的平均收率达到96％以上。