A digital image-based colorimetric method for measuring free acidity in edible vegetable oils,Food Chemistry

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A digital image-based colorimetric method for measuring free acidity in edible vegetable oils
Food Chemistry ( IF 8.5 ) Pub Date : 2024-01-24 , DOI: 10.1016/j.foodchem.2024.138555
Amanda Carolina Souza Andrada Anconi ₁ , Júlia Letícia de Jesus Fonseca ₂ , Cleiton Antônio Nunes ₂

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The standard method used to quantify free acidity (FA) in vegetable oil is neutralization titration, which requires many toxic chemicals and depends on an analyst's experience in detecting endpoints. Here, a digital image colorimetry (DIC) method using a smartphone camera was developed to measure FA in vegetable oils. A cupric acetate solution was used to produce the colorimetric reaction. The coloured solutions were imaged, and R values (from the RGB colour system) were calibrated against the respective FAs in the standards. The FA values of the samples were determined by standard addition calibration. These results were compared to measurements of FA obtained by the standard titrimetric method. An excellent correlation was obtained, with an R2 of 0.98 and a mean absolute error of 0.06%. The chemicals needed for analysis were reduced by approximately 90%. Thus, DIC is a less subjective and more economical method for determining FA in vegetable oils.

中文翻译：

一种基于数字图像的比色法测量食用植物油中的游离酸度

用于量化植物油中游离酸度（FA）的标准方法是中和滴定，这需要许多有毒化学品，并且取决于分析人员在检测终点方面的经验。在这里，开发了一种使用智能手机相机的数字图像比色法（DIC）方法来测量植物油中的 FA。使用乙酸铜溶液进行比色反应。对着色溶液进行成像，并根据标准中的相应 FA 校准 R 值（来自 RGB 颜色系统）。样品的 FA 值通过标准加入校准确定。将这些结果与通过标准滴定法获得的 FA 测量值进行了比较。获得了极好的相关性，R2 为 0.98，平均绝对误差为 0.06%。分析所需的化学品减少了约 90%。因此，DIC 是测定植物油中 FA 的一种不太主观且更经济的方法。

更新日期：2024-01-24

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