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超声提取-紫外分光光度法测定海洋沉积物中油类的研究
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作者 袁广旺 张晓昱 付丹 《中国资源综合利用》 2024年第8期30-34,共5页
利用超声提取和离心分离方法替代手工振荡提取和分液漏斗洗涤分离方法提取海洋沉积物中的油类,研究最佳试验条件,并与标准方法开展比对。试验结果表明,超声提取法总体较手工振荡法回收率高10个百分点,且工作流程简单、操作方便快速,减... 利用超声提取和离心分离方法替代手工振荡提取和分液漏斗洗涤分离方法提取海洋沉积物中的油类,研究最佳试验条件,并与标准方法开展比对。试验结果表明,超声提取法总体较手工振荡法回收率高10个百分点,且工作流程简单、操作方便快速,减少了提取液多次转移的误差,在提高工作效率的同时提升了分析方法的精密度和正确度。 展开更多
关键词 超声提取-紫外光度法 海洋沉积物 油类
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紫外分光光度法测定阿糖胞苷滴眼剂含量 被引量:1
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作者 肖月芬 王育良 《药学与临床研究》 1997年第4期29-30,共2页
盐酸阿糖胞苷滴眼剂是医院常用制剂之一,由于它具有很强的生理作用,准确定量有重要意义。本品的含量测定方法有提取分光光度法,减背景吸收的分光光度法等,但方法较繁琐。根据吸收光谱特征,应用双波长系数倍率法可不经分离直接测定盐酸... 盐酸阿糖胞苷滴眼剂是医院常用制剂之一,由于它具有很强的生理作用,准确定量有重要意义。本品的含量测定方法有提取分光光度法,减背景吸收的分光光度法等,但方法较繁琐。根据吸收光谱特征,应用双波长系数倍率法可不经分离直接测定盐酸阿糖胞苷的含量,具有准确、快速、简便的优点,是一种适合医院使用的分析方法。 展开更多
关键词 盐酸阿糖胞苷 滴眼剂 光度法测定 系数倍率法 尼泊金 吸收度 提取分光光度法 光度 盐酸液 双波长
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牡丹叶总黄酮提取工艺条件优化研究 被引量:7
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作者 李叶 唐浩国 +2 位作者 刘建学 单方方 杨宝洞 《农业技术与装备》 2009年第02X期14-16,共3页
用分光光度法对总黄酮的含量进行测定。采用单因素和正交实验的方法探讨牡丹叶中黄酮类化合物的最佳提取工艺。研究结果表明,芦丁在0.0125-0.0625mg/mL范围内浓度与吸光度有良好的线性关系。最佳提取工艺条件:25倍量60%乙醇在80... 用分光光度法对总黄酮的含量进行测定。采用单因素和正交实验的方法探讨牡丹叶中黄酮类化合物的最佳提取工艺。研究结果表明,芦丁在0.0125-0.0625mg/mL范围内浓度与吸光度有良好的线性关系。最佳提取工艺条件:25倍量60%乙醇在80℃条件下加热回流提取3h。黄酮提取率为2.27%,干粉黄酮纯度为5.27%。 展开更多
关键词 牡丹叶黄酮类化合物光度法提取
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不同提取条件对黄连中小檗碱含量的影响 被引量:7
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作者 张小斌 雷艳妮 陈书存 《陕西农业科学》 2021年第11期52-56,共5页
优选黄连小檗碱的最佳提取条件。采用乙醇回流提取法提取,考察过程要综合很多因素,提取时间与溶剂浓度都应划进考察范围,小檗碱含量为检测指标,用紫外分光光度法测定其含量。当盐酸小檗碱浓度保持在每毫升0.004~0.020 mg时,溶剂浓度同... 优选黄连小檗碱的最佳提取条件。采用乙醇回流提取法提取,考察过程要综合很多因素,提取时间与溶剂浓度都应划进考察范围,小檗碱含量为检测指标,用紫外分光光度法测定其含量。当盐酸小檗碱浓度保持在每毫升0.004~0.020 mg时,溶剂浓度同其吸光度存在线性关系,且呈现情况较为显著,线性方程为Y=49.993X+0.028 9,R^(2)=0.993,平均回收率为99.29%,用75%乙醇溶液提取3 h,黄连中小檗碱含量最高,达12.42%。优选黄连小檗碱的最佳提取条件为提取溶剂75%乙醇溶液,提取时间3 h。该提取条件可为中药黄连制剂生产提供一定的实验依据。 展开更多
关键词 小檗碱含量 提取条件 黄连 回流提取法/紫外光度法
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华北地区野生青蒿中青蒿素的提取和检测
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作者 刘美琴 任石苟 李奠础 《山东化工》 CAS 2018年第23期98-99,共2页
青蒿是一种常见的野生植物,青蒿中的青蒿素具有重要的药用价值。采集野生青蒿,并区分根、茎、叶和籽,以乙醇作为提取液,在室温条件下进行了浸提,浸提液经活性炭脱色处理,采用紫外分光光度计进行了定性和定量分析,并与市购中药材青蒿在... 青蒿是一种常见的野生植物,青蒿中的青蒿素具有重要的药用价值。采集野生青蒿,并区分根、茎、叶和籽,以乙醇作为提取液,在室温条件下进行了浸提,浸提液经活性炭脱色处理,采用紫外分光光度计进行了定性和定量分析,并与市购中药材青蒿在相同实验条件下进行了比对。结果表明:在该实验条件下,野生青蒿和市购中药材青蒿中都有青蒿素存在;同等条件下野生青蒿籽中的青蒿素含量高于根、茎、叶中的青蒿素含量;野生青蒿籽中的青蒿素含量高于市购中药材中的青蒿素含量。 展开更多
关键词 青蒿 青蒿素 提取 紫外-可见光度法
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Optimization of Ultrasound-assisted Extraction Conditions for Polysaccharides from Pinus tabulaeformis Seed Shells
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作者 蒋龙 杨国庆 +2 位作者 杨鹏 刘伟 张大伟 《Agricultural Science & Technology》 CAS 2013年第12期1826-1829,共4页
[Objective] This study aimed to investigate the optimal technological condi- tions for ultrasouqd-assisted extraction of polysaccharides from Pinus tabulaeformis seed shells. [Melhod] Polysaccharides were extracted fr... [Objective] This study aimed to investigate the optimal technological condi- tions for ultrasouqd-assisted extraction of polysaccharides from Pinus tabulaeformis seed shells. [Melhod] Polysaccharides were extracted from P. tabulaeformis seed shells by ultrasound-assisted hot water extraction method and detected by phenol- concentrated sulfuric acid method. The effect of extraction temperature, extraction duration, solid-liquid ratio and extraction frequency on the extraction of polysaccha- rides was investigated using single-factor gradient experiment and the extraction conditions for polysaccharides from P. tabulaeformis seed shells were optimized us- ing L9(34) orthogonal design. [Result] The content of polysaccharides extracted twice at 60 ℃ for 25 min with solid-liquid ratio of 1:3.5 reached the maximum. The re- covery rate (n=-5) ranged from 97.71% to 100.67% and RSD was 1.56%, suggesting high stability. [Conclusion] A simple and efficient method for ultrasound-assisted ex- traction of polysaccharides from P. tabulaeformis seed shells was established in this study, which laid solid foundation for the development and utilization of abandoned pine nut shell resources. 展开更多
关键词 Ultrasound-assisted extraction Spectrophotography Pinus tabulaeformis seed shells Polvsaccharides
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A Rapid Extraction Procedure for the Determination of Strontium-90 in Water Samples
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作者 Markus Zehringer Johannes Abraham +2 位作者 Franziska Kammerer Vlora Syla Michael Wagmann 《Journal of Chemistry and Chemical Engineering》 2017年第3期116-123,共8页
A beta spectrometric method for the rapid determination of strontium-90 (90Sr) in water samples was developed and tested. 90Sr is extracted directly from the water samples by means of a scintillator cocktail, contai... A beta spectrometric method for the rapid determination of strontium-90 (90Sr) in water samples was developed and tested. 90Sr is extracted directly from the water samples by means of a scintillator cocktail, containing the crown ether dicyclohexano-18-crown-6 as an extracting agent (STRONEX). Minimal clean-up is necessary when other beta nuclides are present, such as barium-140. These nuclides are eliminated by a barium chromate scavenge, prior to the extraction step. The method presented here allows for the investigation of at least 12 water samples a day and is therefore a suitable tool for emergency analysis. 展开更多
关键词 STRONTIUM-90 beta spectrometry emergency analysis STRONEX.
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Investigation of Dyeing Properties of Different Fabric Species with Alkanna Orientalis Root Extract
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作者 Adem Onal Ferda Eser Seda Bayrak 《Journal of Food Science and Engineering》 2017年第4期213-220,共8页
In this study, the dyeing properties of different fabric species were investigated using root extract of yellow sormunen (Alkanna orientalis). For this purpose, the cotton and wool fabrics were dyed using the root e... In this study, the dyeing properties of different fabric species were investigated using root extract of yellow sormunen (Alkanna orientalis). For this purpose, the cotton and wool fabrics were dyed using the root extract of yellow sormunen by pre-mordanting, together-mordanting and last-mordanting methods with copper sulfate (CuSO4), iron sulfate (FeSO4) and aluminum sulfate (AiK(SO4)2) at medium pH. The same procedure was applied to cotton and wool fabrics that allowed in Artifical Urinary System (AUS) [%3 NH3 + %3 urea + %3 CAC2O4(g/v)] for 24 h. The color codes were determined with Pantone Color Quide, and K/S and L* a* b* values were detected with color measurement spectrophotometer, and also washing-, crocking-fastness levels were evaluated using gray scale. According to the evaluations, the fabrics dyed pre-treated with AUS have higher fastness values than the unpre-treated dyed fabrics with AUS. 展开更多
关键词 Yellow sormunen Alkanna orientalis MORDANT WOOL cotton fastness.
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