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1.
Applications of phytic acid 总被引:5,自引:0,他引:5
Ernst Graf 《Journal of the American Oil Chemists' Society》1983,60(11):1861-1867
Phytic acid (myo-inositol hexaphosphate) constitutes 1-3% of most plant seeds. Its tremendous chelating potential and its
effects on the absorption of polycationic nutrilites such as Ca2+, Zn2+ and Fe3+ have been the subject of intense investigation for several decades. Yet in the American literature there is virtually no
information available on other chemical properties of phytic acid or on its beneficial utilization. This review summarizes
the present medical, dental, nutritional and industrial applications of phytic acid and suggests additional novel uses for
this inexpensive and easily obtained chemical. 相似文献
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植酸在金属防腐中的应用研究 总被引:4,自引:0,他引:4
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。 相似文献
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植酸的缓蚀阻垢性能的研究 总被引:1,自引:0,他引:1
植酸是从粮食作物中提取的有机磷酸化合物,它是天然的无毒化工产品。通过鼓泡法和旋转腐蚀挂片失重法对其阻垢性能和缓蚀性能进行了评价。结果表明植酸具有一定的缓蚀性能和阻垢性能,其阻垢性能虽比常用的药剂PBTCA、HEDP、HPMA稍差,但可通过同其他的药剂复配生成低磷或无磷的阻垢剂,是较有发展前景的绿色缓蚀阻垢产品。 相似文献
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肌醇六磷酸脂在热管表面处理中的应用研究 总被引:1,自引:0,他引:1
对热管采用肌醇六磷酸脂进行表面处理后,在金属表面形成致密的钝化层.可以获得良好的防腐性能,从而提高工质和热管管材的相容性,避免热管内产生不凝气.有利于提高热管的使用寿命。试验结果表明,肌醇六磷酸脂处理方法是一种高效、环保、具有良好发展前景的表面工艺。 相似文献
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Lilian U. Thompson 《Journal of the American Oil Chemists' Society》1987,64(12):1712-1717
The interaction of phytic acid (PA) with proteins is dependent on the charges and conformation of the proteins and the ionic
strength of the solution. Hence, changes in these parameters brought about by acylation could change the extractability, precipitation
and interactions of PA with protein and minerals and consequently the PA concentration of protein isolates from phytate-containing
foods. This paper summarizes studies in rapeseed and navy bean flours which demonstrate that a high degree of succinylation
or acetylation can be used to separate the proteins from the PA and to prepare low phytate protein isolates of good functional
properties. The separation of PA from the protein in rapeseed flour occurred during the extraction stage, while that in navy
bean flour occurred at the isoelectric precipitation stage. 相似文献
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Yunpeng Nie Tao Wang Meng Wu Yan Qi Wenchao Wei Qi Wang 《International Journal of Applied Ceramic Technology》2022,19(3):1498-1510
With the development of biomaterials, a hydroxyapatite (HA) bone cement based on chelation has gradually attracted attention. This paper presents an investigation on the micromorphology and mechanical property of HA bone cement prepared by HA powders modified by inositol hexaphosphate (IP6, phytic acid). With the citric acid monohydrate (CA) solution used as setting liquid, scanning electron microscopy (SEM) and universal testing machine were employed to investigate the influence of parameters including concentrations of CA as well as powder–liquid ratio on the properties of HA bone cement. In addition, the setting mechanism of chelating cement was analyzed. The results showed that when CA concentration was more than 20 wt.%, the curing products of IP6/CA dual chelating HA cement contained calcium citrate tetrahydrate and tricalcium phosphate (TCP) besides HA. The compressive strength of dual chelated cement increased with the CA concentration. With 10 000 ppm-IP6-HA used as the starting powder, the maximum compressive strength of bone cement prepared with 40 wt.% CA as the setting liquid was up to 57 MPa. Furthermore, the temperature, pH, antibacterial activity measurement, and cell studies in vitro were carried on, suggesting that chelate-setting HA cement has potential development in orthopedic materials. 相似文献
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Copolymers obtained by the condensation of p-hydroxybenzoic acid, p-bromophenol, and formaldehyde showed characteristic titration curves in non-aqueous media. The titration curves indicated a series of breaks which bear integral relations to each other. These features have been interpreted in terms of homoconjugation, intramolecular hydrogen bond formation, and composition of the copolymers. 相似文献
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Guozhe Meng Feilong Sun Tao Zhang Fuhui Wang Chaofang Dong 《Electrochimica acta》2010,55(20):5990-9102
In this work, the pure Ni coatings were synthesized on Q235 steel by using reverse pulsed electrodeposition technique in sulphate-based baths with 0, 0.1, 0.2 and 0.3 g/L phytic acid additive. The effect of phytic acid on the microstructure and micro-morphology of the sample was observed by transmission electron microscopy (TEM) and scanning electron microscopy (SEM), respectively. And the effect of phytic acid on the corrosion resistance of the sample was studied by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. The results demonstrated that the addition of phytic acid was in favor of the growth of nano-scale twins (NT) in the interior of grains, which was due to the lowered stacking fault energies of Ni during the electrodeposition, and the typical morphology of pyramidal islands on the surface. The results also demonstrated that the effect of phytic acid was not monotonous with increasing concentration: the passive current density ip was minimum and the charge transfer resistance Rt was maximum for the sample obtained from the bath with 0.2 g/L phytic acid, indicating that the sample obtained from the bath with 0.2 g/L phytic acid showed the best corrosion resistance. 相似文献
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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。 相似文献
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Beneficial effects of dietary phytic acid (myo-inositol hexaphosphate; IP6) have often been explained by its strong iron ion-chelating ability, which possibly suppresses iron ion-induced oxidative
damage in the gastrointestinal tract. Because phytic acid is hydrolyzed during digestion, this work aimed to know whether
its hydrolysis products (IP2′ IP3′, IP4′ and IP5) could still prevent iron ion-induced lipid peroxidation. Studies using liposomal membranes demonstrated that hydrolysis
products containing three or more phosphate groups are able to inhibit iron ion-induced lipid peroxidation although their
effectiveness decreased with dephosphorylation. Similarly, they also prevented iron ion-induced decomposition of phosphatidylcholine
hydroperoxide. These results demonstrate that intermediate products of phytic acid hydrolysis still possess iron ion-chelating
ability, and thus they can probably prevent iron ion-induced lipid peroxidation in biological systems. 相似文献
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C. H. Liang R. F. Zheng N. B. Huang L. S. Xu 《Journal of Applied Electrochemistry》2009,39(10):1857-1862
A phytic acid chemical conversion bath was applied to a sample of AZ31 magnesium alloy in this study; a transparent conversion
coating formed subsequently on the sample surface. The test results of this coating with a scanning electron microscope (SEM)
showed that there exist compact coatings on the surface of treated magnesium alloy. With the analyses of electronic probe
microscopy (EPMA) and IR spectrum, a further study of this coating indicated that the coating was mainly composed of phytate
and oxide or hydroxid. Furthermore, The electrochemical tests showed that the phytic acid bath conversion treatment enhanced
the corrosion resistance of AZ31 magnesium alloys. The optimal pH of the phytic acid bath was 9.00–10.00. 相似文献
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Yan Li Shu Cai Sibo Shen Guohua Xu Feiyang Zhang Fengwu Wang 《Journal of Coatings Technology and Research》2018,15(3):571-581
In order to improve the corrosion resistance of a biodegradable magnesium alloy, a series of phytic acid/3-aminopropyltrimethoxysilane (γ-APS) hybrid coatings was prepared on AZ31 magnesium alloys by dipping the magnesium alloy into the mixing solution of phytic acid and γ-APS. During the preparation of hybrid coatings, the pH values of the mixing solutions greatly affected the uniformity of the coatings and subsequently influenced their corrosion resistance. Electrochemical tests indicated that the hybrid coating prepared in the solution of pH = 8.0 could highly improve corrosion resistance of AZ31 magnesium alloys. Meanwhile, corrosion current density of the hybrid coating coated sample was significantly decreased from the uncoated sample of 138.1 ± 11.9 to 8.5 ± 0.8 μA cm?2. Immersion test in simulated body fluid revealed that the cracks on the surface of the hybrid coating gradually healed up during the lengthy immersion. 相似文献
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比较了电位滴定法和反滴定法测定烯烃含量的准确性.结果表明,在所测定的质量分数范围内电位滴定法的相对误差为2%~10%;反滴定法的相对误差为-4.5%~8.5%.烯烃的质量分数在2%~10%之间时,电位滴定法比反滴定法的测量结果更加准确,相对误差约为2%~3%;烯烃的质量分数在0.040%~0.62%之间时,反滴定法比电位滴定法的测量结果更加准确,相对误差约为-3.5%~-4.5%. 相似文献