[Improved Indophenol Titration Method for Ascorbic Acid Using a Dropper and Electronic Balance: Enhanced Convenience and Efficiency].

IF 0.2 4区 农林科学 Q4 FOOD SCIENCE & TECHNOLOGY Food Hygiene and Safety Science Pub Date : 2024-01-01 DOI:10.3358/shokueishi.65.1
Keizo Umegaki, Mika Ito, Kaori Yokotani, Shizuo Yamada
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Abstract

The analysis of ascorbic acid using the 2,6-dichloroindophenol (DCIP) titration method is a well-established technique, but requires the skilled handling of a burette for accurate measurements. In the present study, we propose a modified DCIP titrimetric method that replaces the burette with a dropper and employs an electronic balance to measure the titrated amount by weight. The dropper used can be flexibly selected, allowing for a wide range of drop sizes, from large to very small. This modification offers several advantages, including lower skill requirements, a 43% reduction in the analysis time, a 50% decrease in sample/reagent consumption, and the ability to prepare DCIP standard solutions tailored to the concentration of ascorbic acid in the sample being analyzed. Our analysis of several food samples using this improved method showed that inherent issues of the DCIP method, such as determining the titration end point, could not be resolved. Nevertheless, the improved titration method remains more convenient and adaptable than the original approach using a burette, enabling quick and accurate analysis, especially for unskilled analysts.

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[使用滴管和电子天平的改进型抗坏血酸靛酚滴定法:提高便利性和效率]。
使用 2,6-二氯靛酚(DCIP)滴定法分析抗坏血酸是一项成熟的技术,但需要熟练操作滴定管才能准确测量。在本研究中,我们提出了一种改进的 DCIP 滴定法,用滴管代替滴定管,并使用电子天平测量滴定量的重量。使用的滴管可以灵活选择,滴液大小范围很广,从大滴到极小滴均可。这种改良方法有几个优点,包括对技术要求较低、分析时间缩短 43%、样品/试剂消耗量减少 50%,以及能够根据分析样品中的抗坏血酸浓度制备 DCIP 标准溶液。我们使用这种改进方法对几种食品样品进行的分析表明,DCIP 方法的固有问题(如确定滴定终点)无法解决。尽管如此,改进后的滴定方法仍然比原来使用滴定管的方法更方便、更适用,能够快速、准确地进行分析,尤其适合不熟练的分析人员。
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来源期刊
Food Hygiene and Safety Science
Food Hygiene and Safety Science Medicine-Public Health, Environmental and Occupational Health
CiteScore
0.70
自引率
0.00%
发文量
28
审稿时长
18-36 weeks
期刊介绍: Information not localized
期刊最新文献
[Analytical Method for Melengestrol Acetate in Livestock Products Using LC-MS/MS]. [Establishment of Rapid Simultaneous Analysis Method for Plant Toxins by LC-TOF-MS]. [Implementation and Evaluation of Risk Communication Regarding Residual Pesticides]. [Improved Indophenol Titration Method for Ascorbic Acid Using a Dropper and Electronic Balance: Enhanced Convenience and Efficiency]. [Comparison of DNA Extraction Methods for Processed Foods Containing Soybean or Maize].
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