共查询到20条相似文献,搜索用时 46 毫秒
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如今,“食品级”这个名词不断地抛头露面,如食品级原材料、食品(级)添加剂、食品级润滑油……就连国家有关部门正在制定的中国首部《食品安全法》(草案), 也将“食品级”这一名词引用其中。“您的生产食品级了吗?”将成为食品行业的流行语。 相似文献
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本文介绍了食品级润滑油(脂)产品概况,简要分析了我国食品级润滑油(脂)的市场现状,总结概述了国外有关食品级润滑油(脂)的注册认证监管制度和相关标准制定情况,梳理了我国已制定的食品级润滑油(脂)的相关国家标准。通过食品级与工业级润滑油的对比检测分析,证明食品级润滑油中汞、金属及非金属元素、芳香族化合物等有毒有害物质均低于工业级润滑油。简要分析了我国针对食品级润滑油(脂)产品监管措施及标准建立中存在的不足,从注册认证审核制度建设、产品技术标准建立、有毒有害指标限量及检测方法建立、海边分类编码单列、食品生产企业中食品级润滑油(脂)的使用监管等几个方面并给出了工作建议,旨在为我国相关政府部门和食品生产企业提供参考。 相似文献
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本文介绍了食品级润滑油(脂)产品概况,简要分析了我国食品级润滑油(脂)的市场现状,总结概述了国外有关食品级润滑油(脂)的注册认证监管制度和相关标准制定情况,梳理了我国已制定的食品级润滑油(脂)的相关国家标准。通过食品级与工业级润滑油的对比检测分析,证明食品级润滑油中汞、金属及非金属元素、芳香族化合物等有毒有害物质均低于工业级润滑油。简要分析了我国针对食品级润滑油(脂)产品监管措施及标准建立中存在的不足,从注册认证审核制度建设、产品技术标准建立、有毒有害指标限量及检测方法建立、海边分类编码单列、食品生产企业中食品级润滑油(脂)的使用监管等几个方面并给出了工作建议,旨在为我国相关政府部门和食品生产企业提供参考。 相似文献
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分光光度-低压离子色谱法测定Cu2+、Ni2+、Zn2+、Pb2+、Fe2+和Mn2+ 总被引:1,自引:1,他引:0
建立了分光光度-低压离子色谱法测定Cu2+、Ni2+、Zn2+、Pb2+、Fe2+和Mn2+6种重金属离子的分析方法.选用柠檬酸-草酸混合液作为洗脱体系进行梯度洗脱,将6种金属离子完全分离,柱后采用1-(2-吡啶偶氮)-2-萘酚(PAN)进行衍生反应,于波长560 nm处进行检测.6种离子的检出限分别为0.006、0.012、0.005、0.125、0.070、0.020 mg/L.该方法用于环境水样测定,结果与原子吸收法所测值基本吻合,分析结果令人满意. 相似文献
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添加助剂的过氧化氢漂白 总被引:2,自引:0,他引:2
麦草NaOHO2/NaOH两段蒸煮纸浆具有良好的可漂性,采用简单的酸处理H2O2漂白(AP)程序,仅用15%的H2O2可使漂白浆的白度达到74%~753%(ISO)。为了进一步提高麦草NaOHO2/NaOH两段蒸煮纸浆无氯漂白的效果,又进行了添加助剂的H2O2漂白试验。1试验部分漂白用浆为麦草NaOH预处理O2/NaOH蒸煮的氧碱浆,其白度为594%(ISO),卡伯值109,粘度827ml/g。漂白采用酸处理H2O2漂白(AP)程序,浆样先用H2SO4进行预处理,再进行H2O2漂白。酸处理在烧杯中进行,H2… 相似文献
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氯化钙用于高得率浆H2O2漂前预处理 总被引:2,自引:1,他引:2
研究了CaCl2用于高得率桦木浆H2O2漂前预处理的效果,并与DTPA、EDTA、H2SO4等预处理剂的预处理效果进行了比较。结果表明,CaCl,是一种优良的预处理剂。CaCl2预处理的适宜条件为:用量0.5%,pH值7,温度40℃,时间25min。 相似文献
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Yu-Jing Zhu Han-Tao Zhou Yong-Hua Hu Jian-Yang Tang Ming-Xing Su Yun-Ji Guo Qing-Xi Chen Bo Liu 《Food chemistry》2011
The inhibition kinetics of 2-phenylethanol, 2-phenylacetaldehyde and 2-phenylacetic acid on the enzyme activity of mushroom tyrosinase have been investigated. The results showed that these aromatic compounds can lead to reversible inhibition of the enzyme; furthermore, 2-phenylacetaldehyde and 2-phenylacetic acid are uncompetitive inhibitors and 2-phenylethanol is a mixed-type inhibitor. The inhibition constants have been determined and the inhibiting ability was: 2-phenylacetaldehyde > 2-phenylacetic acid > 2-phenylethanol, indicating that the functional group on the benzene ring group played an important role in the inhibition of the enzyme. In addition, 2-phenylacetic acid and 2-phenylethanol were found to have effective antibacterial activities, and 2-phenylacetic acid was more effective against Escherichia coli and Ralstonia solanacearum than 2-phenylethanol, but 2-phenylacetaldehyde lacked of antibacterial activity. 相似文献
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Cerrato JM Barrows CJ Blue LY Lezama-Pacheco JS Bargar JR Giammar DE 《Environmental science & technology》2012,46(5):2731-2737
The dissolution of UO(2) in a continuously stirred tank reactor (CSTR) in the presence of Ca(2+) and Zn(2+) was investigated under experimental conditions relevant to contaminated groundwater systems. Complementary experiments were performed to investigate the effect of adsorption and precipitation reactions on UO(2) dissolution. The experiments were performed under anoxic and oxic conditions. Zn(2+) had a much greater inhibitory effect on UO(2) dissolution than did Ca(2+). This inhibition was most substantial under oxic conditions, where the experimental rate of UO(2) dissolution was 7 times lower in the presence of Ca(2+) and 1450 times lower in the presence of Zn(2+) than in water free of divalent cations. EXAFS and solution chemistry analyses of UO(2) solids recovered from a Ca experiment suggest that a Ca-U(VI) phase precipitated. The Zn carbonate hydrozincite [Zn(5)(CO(3))(2)(OH)(6)] or a structurally similar phase precipitated on the UO(2) solids recovered from experiments performed in the presence of Zn. These precipitated Ca and Zn phases can coat the UO(2) surface, inhibiting the oxidative dissolution of UO(2). Interactions with divalent groundwater cations have implications for the longevity of UO(2) and the mobilization of U(VI) from these solids in remediated subsurface environments, waste disposal sites, and natural uranium ores. 相似文献