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黄粉虫中无机元素和维生素的测定与研究 总被引:7,自引:0,他引:7
本文用火焰原子吸收法和荧光法测定黄粉虫中Ca、Mg、Fe、Mn、Zn、Cu等6种无机元素和维生素A、E的含量,结果表明,黄粉虫中人体必需的微量元素和维素含量很高,具有较高的开发价值,为黄粉虫的进一步研究和综合利用提供科学依据。 相似文献
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目的测定马齿苋中无机元素含量,为其药效学研究及食用开发提供资料。方法利用火焰原子吸收光谱法测定马齿苋中钾、钙、钠、镁、铜、锌、铁、锰、铬、镍的含量。结果马齿苋所含10种无机元素中,钾、钙、镁为宏量元素,其余7种为微量元素。结论本研究为马齿苋的后续研究及进一步开发应用提供数据支持。 相似文献
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对蒸谷晚籼米加工工艺中的浸泡、汽蒸、干燥三个重要环节进行了实验,并对蒸谷晚籼米中重要无机元素含量和有机磷农药残留进行了分析。实验结果表明,蒸谷晚籼米制备过程中浸泡、汽蒸和干燥的工艺条件为:在70℃水中浸泡2.5h,于100℃下汽蒸30min,先在110℃下干燥3h后,再在60℃下干燥4h。在此条件下生产的蒸谷晚籼米爆腰率为7.6%,远低于普通白米加工的爆腰率;蒸谷后晚籼米总灰分含量比未蒸谷前增加了34.5%,其中Ca、Fe、Zn等重要无机元素的含量明显增加;此外蒸谷晚籼米中未检出有机磷农药,说明蒸谷晚籼米食用安全性高。 相似文献
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对蒸谷晚籼米加工工艺中的浸泡、汽蒸、干燥三个重要环节进行了实验,并对蒸谷晚籼米中重要无机元素含量和有机磷农药残留进行了分析。实验结果表明,蒸谷晚籼米制备过程中浸泡、汽蒸和干燥的工艺条件为:在70℃水中浸泡2.5h,于100℃下汽蒸30min,先在110℃下干燥3h后,再在60℃下干燥4h。在此条件下生产的蒸谷晚籼米爆腰率为7.6%,远低于普通白米加工的爆腰率;蒸谷后晚籼米总灰分含量比未蒸谷前增加了34.5%,其中Ca、Fe、Zn等重要无机元素的含量明显增加;此外蒸谷晚籼米中未检出有机磷农药,说明蒸谷晚籼米食用安全性高。 相似文献
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将牛奶加热煮沸,加入过量的螯合剂EDTA,调pH值为8,然后用过滤法除去牛奶中蛋白质和非水溶性物质。利用火焰原子吸收法测定牛奶中的钙、镁、铁、锰、锌、铜6种元素,用分光光度法测定牛奶中的磷.测定结果与消化法处理样品基本一致。检出限分别为0.33,0.00439,0.085,0.00822,0.0162和0.578 mg/L。磷的检出限为0.05 mg/L。回收率在90%~110%之间,精密度小于0.5%。该方法灵敏度高、操作简便、安全、结果满意,是牛奶样品快速有效的前处理方法。 相似文献
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目的:建立茶油无机元素的测定方法,为制订茶油有害金属元素限量标准提供参考,同时为其健康食用和规范化栽培基地的选择提供依据。方法:用火焰原子吸收光谱法(FAAS)测定Ca、Fe、Mg、Cu、Zn和K的含量,用石墨炉原子吸收光谱法(GFAAS)测定Pb、Cd和Cr的含量。结果:12份样品中K、Ca、Mg和Fe的含量较高,有害金属元素Pb、Cd和Cr在川雅12、川雅20、川雅21中均未检测出,在其余样品中含量也较低。FAAS法测定Ca、Fe、Mg、Cu、Zn和K的回收率为99.84%~102.55%,RSD为0.55%~2.05%;GFAAS法测定Pb、Cd和Cr的回收率为99.75%~101.85%,RSD为1.87%~3.45%;各元素的相关系数为0.9990~0.9999。结论:该方法操作简便,准确性高,结果可靠,可作为茶油无机元素的定量检测方法。 相似文献
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为了解黑龙江省各地区生产的全脂加糖乳粉中无机元素的含量,作者于1987年5—7月间,通过向生产厂家函购和从市场购买的方式采集到全省51家乳品厂生产的全脂加糖乳粉样品。这些样品用原子分光光度法、极谱法和荧光法,分析测定了乳粉中K、Na、Ca、Mg 4种常量元素和Zn、Cu、Fe、Co等8种微量元素的含量。每100克全脂加糖乳粉中各元素的平均含量测定结果如下:K 1124mg、Na 390mg、Ca 588.9mg、Mg 59.71mgZn 5.534mg、Cu 0.154mg、Fe 1.477mg、Mn 0.597mgCo 0.055mg、Ni 0.067mg、Mo 0.025mg、Se 0.017mg 相似文献
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In this study, oil-in-water formulations were optimized to determine sodium, potassium, calcium, magnesium, zinc, and iron in emulsified chocolate samples by flame atomic absorption spectrometry (FAAS). This method is simpler and requires fewer reagents when compared with other sample pre-treatment procedures and allows the calibration to be carried out using aqueous standards. Octyl stearate was used as oily phase. Tween 80 and Triton X100 were tested as surfactants. The optimum type and proportion of formulations were determined and their choice depended on the element studied. The emulsion preparation was performed by a conventional method that involves mixing both phases at 75 ± 5 °C by magnetic stirring and phase inversion to change the water-to-oil ratio by increasing the volume of the surfactant-water external phase and correspondingly decreasing the volume of internal phase. The validation of the method was performed against a baking chocolate standard reference material (SRM 2384) and recoveries ranged from 88.6% for K to 105.5% for Zn. The proposed method allowed the evaluation of the essential metal status of chocolate with minimum sample manipulation and was reproducible and economical. 相似文献
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葡萄酒中铁的测定采用GB 5009.90-2016《食品安全国家标准食品中铁的测定》第一法火焰原子吸收光谱法-微波消解法,用建立数学模型的方法对结果的不确定度进行评估和计算.对标准溶液的配制、测量重复性、仪器稳定性各分量不确定度进行分析,得到了各分量不确定度和合成不确定度,最终得出更加客观的结果. 相似文献
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采用原子吸收分光光度计测定了新疆岩蜥(Laudakia stoliczkana Blanford)和塔里木岩蜥(Laudakia tarimensis Zugmayer)全体、肌肉与皮肤中的K、Ca、Na、Mg、Fe、Zn、Mn、Sr、Cu、Mo、Cr、Ba、Co、V、Pb、Cd、Ni及Be18种元素的含量。结果表明,这两种岩蜥的常量元素和微量元素含量都比较丰富,其中K、Ca、Na、Mg、Fe、Zn、Sr、Mn、Cr、Br、Cu、Co、Mo含量比较高,而有毒元素Al、Pb、Ni和Cd的含量甚低。在这两种岩蜥全体、肌肉与皮肤三种样品中全体样品元素含量最高,但各元素含量的差异不明显。对两种岩蜥体内人体必需而具有抗癌作用的Fe、Zn、Sr、Mn等微量元素含量进行比较发现,新疆岩蜥分别为168.36、94.14、78.12、44.28μg/g,塔里木岩蜥分别为338.22、183.16、88.44、32.46μg/g。塔里木岩蜥中的Fe、Zn、Sr含量高于新疆岩蜥,而新疆岩蜥的Mn含量高于塔里木岩蜥。新疆岩蜥和塔里木岩蜥作为中药及维吾尔医药具有较高的药用价值及应用前景,并讨论了这些元素与其药用机理的关系,为这两种药用岩蜥的进一步研究及其开发利用提供科学依据。 相似文献
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In this study, new coprecipitation methods were developed using a combination of N-benzoyl-N-phenylhydroxylamine (BPHA) as a chelating reagent and copper(II) and iron(III) as coprecipitate carriers. The determinations of Fe(III), Cr(III) and Cr(VI) with Cu(II)–BPHA coprecipitant and of Cu(II), Pb(II), Cr(III) and Cr(VI) with Fe(III)–BPHA coprecipitant were made by flame atomic absorption spectrometry. The surface morphology of coprecipitants was examined by scanning electron microscopy. The coprecipitation conditions for each method such as the effect of pH, the amounts of carrier element and BPHA, sample volume and matrix effects were examined. The optimum pH for each method was found to be 6. The detection limits of the methods changed in the range of 0.23–3.2 μg L−1 with an enrichment factor of 100. The RSD % was ?4.2. The accuracy of the methods was confirmed by analysing the certified reference material. The developed methods were applied for the determination of analytes in food samples. 相似文献
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