• 物质以对羟基苯甲酸为原料,三步合成。

    The substance was synthesized from P-hydroxybenzoic acid through three steps.

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  • 丙烯酸的生物毒性大于对羟基苯甲酸

    Cinnamic acid had more greater action intensity than p-hydroxy benzoic acid.

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  • 羟基苯甲酸甲酯6);

    Protocatechuic acid methyl ester (6);

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  • 一个没有羟基苯甲酸酯类天然产物

    It is a natural product with no parabens.

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  • 染料,香水羊毛脂羟基苯甲酸甲醛

    FREE of Dyes, Perfume, Lanolin, Parabens and Formaldehyde.

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  • 用于制备3,4,5-三羟基苯甲酸混合催化剂

    Mixed catalyst for preparing methyl ester of 3,4,5-trihydroxybenzoic acid methyl ester.

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  • 微量热法研究漆酶3,4,5-三羟基苯甲酸反应

    Studies on the Reaction Between Laccase and 3,4,5-Trihydroxybenzoic Acid by Microcalorimetry.

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  • 羟基苯甲酸,十二烷基硫酸钠矿物油合成染料

    Contains no parabens, sodium lauryl sulfate, mineral oil or synthetic dyes.

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  • 防腐剂、人工色素香料矿物油,对羟基苯甲酸甲酯、矿

    Free of preservatives, artificial color, fragrance, mineral oil, parabens, petroleum.

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  • 研究了对羟基苯甲酸羟基苯甲酸对天然橡胶与黄铜粘合影响

    The effect of cobalt and nickel p-hydroxy benzoates on the adhesion between NRand brass was studied.

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  • 方法:以5 氯2 羟基苯甲酸甲酯为原料,硝化、还原反应合成

    METHOD: It was synthesized from methyl 5-chloro-2-hydroxyl benzoic acid via nine-step reaction with nitration, reduction, etc.

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  • 方法以对羟基苯甲酸原料三步合成,即原料化、酰氯制备酰胺化。

    Methods The substance was synthesized from P-hydroxybenzoic acid through three steps, those are etherification, preparation of acyl halide and amidation of the raw material.

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  • 介绍七种合成羟基苯甲酸1方法对这些方法的优缺点进行了讨论。

    Seven methods of synthesis ofm-hydroxybenzoic acid(1) were reviewed and their advantages and disadvantages were also discussed in this paper.

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  • 发明使用具体化学式表示的2- 羟基苯甲酸衍生物药学上可接受

    The present invention uses the 2-hydroxybenzoic acid derivative represented by the specific chemical formula or its pharmaceutically acceptable salt.

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  • 适宜反应条件下羟基苯甲酸壳聚糖酯化130%、得80%以上。

    Under optimum reaction conditions, esterification degree of para-hydroxybenzoate chitosan ester was 130%, and yield reached 80%.

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  • 本文研究了一种固体催化剂阳离子交换树脂催化剂,用于对羟基苯甲酸酯化反应

    In this paper, the strong acid ion exchange resins have been studied as the solid-acid catalyst for the esterification of 4-hydroxybenzoic acid.

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  • 氨基-5-羟基苯甲酸AHBA微生物产生安莎类抗生素及其相关抗生素必需前体

    The compound, 3-amino-5-hydroxybenzoic acid(AHBA), is the specific and indispensible starter unit for the biosynthesis of ansamycins in microbes.

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  • 本文研究温度紫外光食品防腐剂山梨、对羟基苯甲酸乙酯稳定性防霉效果影响。

    In this paper, the affects of temperature and ultraviolet light on the stability and mildewproof effect of sorbic acid and ethyl-p-hydroxybenzoate used as food preserving agent, was studied.

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  • 分析了添加不同羟基苯甲酸或对羟基苯甲酸甲酯对样品凝聚粒子含量流变性能的影响

    The effects of the amount of additive on the coagulate particle contents and rheologic properties are analyzed.

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  • 维生素C为催化剂, 对羟基苯甲酸十六及十八醇为原料合成金十六尼泊金十八酯。

    Nipagin esters were synthesized by the esterification of dodecyl and octadecyl alcohol with p -hydroxybenzoic acid in the presence of vitamin C.

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  • 2,4-二羟基苯甲酸甲酯为原料经过反应水解反应羧反应合成2,4-二氯间苯二酚。

    The compound 2,4-dichlororesorcinol was obtained from the starting material 2,4-dihydroxybenzoate via chlorinated reaction, hydrolysis and decarboxylation.

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  • 主要成份:去离子水氢化聚癸烯、对羟基苯甲酸甲酯、对羟基苯甲酸丙酯丙烯酸共聚物矿物油香料

    INGREDIENTS: Deionized water, hydrogenated poly-decene, methyl p-hydroxybenzoate p-hydroxybenzoic acid propyl, acrylic acid copolymer, mineral oil, daily flavor.

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  • 结构相似的苯酚、对羟基苯甲酸、对氨基苯甲酸响应不灵敏,对结构差异较大的维生素C几乎响应

    Structural analogs, such as phenol, p-hydroxybenzoic acid and p-aminobenzoic acid, only small responses electrode were observed. Moreover, structural unanalog vitamin C had almost no response.

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  • 最近媒体报道来自上海零度可乐原液中含有“对羟基苯甲酸甲酯”防腐剂,引发了大家对饮料安全性的关注。

    Recent media reports that a batch of Coke Zero concentrate from Shanghai contained the banned preservative methyl-p-hydroxybenzoate sparked concern about the safety of beverages.

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  • 未最终证实暂时认为乳腺癌的发病有关。诸多日用品都能见到对羟基苯甲酸酯类-化妆品,面任何护肤品。

    It hasn't been proven definitively, but has been tentatively linked to breast cancer. You'll notice parabens in a lot of products — makeup, lotions and any body products.

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  • 以对羟基苯甲酸甲酯1,4丁二醇为主要原料,熔融交换合成介晶基-对羟基苯甲酸丁二醇酯(BBHB);

    Bis(p-hydroxybenzonic acid butanediolate)(BBHB)as mesogenic unit was prepared with methyl p-hydroxybenzoate, 1,4-butanediol and catalyst by melting transesterification.

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  • 辛醇原料,合成1-溴辛烷,将1-溴辛烷羟基苯甲酸甲酯反应,然后水解,得到了4 -辛氧基苯甲酸

    1-bromooctane was manufactured by n -octanol as material, and reacted with methyl o -hydroxybenzoate, the 4-octanoxy benzoic acid was obtained.

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  • 幼儿吸收防腐剂)对羟基苯甲酸丙酯羟基苯甲酸丁酯类防腐剂数量可能会产生类雌激素风险,导致内分泌系统障碍。

    The amounts that two-year-olds absorb from the [preservative] parabens propylparaben and butylparaben can constitute a risk for oestrogen-like disruptions of the endocrine system.

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  • 研究以焦性没食子衍生物2,3,4-三羟基苯甲酸为原料经过甲基化、水解酸化精制成2,3,4-三甲氧基苯甲酸

    Preparation method of 2,3,4-trimethoxybenzoic acid is introduced, which was synthesized from 2,3,4-trihydroxybenzoic acid by methylation, hydrolysis, acidification and purification.

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  • 研究以焦性没食子衍生物2,3,4-三羟基苯甲酸为原料经过甲基化、水解酸化精制成2,3,4-三甲氧基苯甲酸

    Preparation method of 2,3,4-trimethoxybenzoic acid is introduced, which was synthesized from 2,3,4-trihydroxybenzoic acid by methylation, hydrolysis, acidification and purification.

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