HUANG Ai-jun, HUANG Wei-xuan, CHEN Long-xuan, CHEN Zi-jian. Rapid Detection of Acetohydroxamic Acid in Wheat Flour and Its Products by Visual Colorimetric Method Coupled with Smartphone Imaging Technology[J/OL]. Journal of Instrumental Analysis, 2026, 1-10.
DOI:
HUANG Ai-jun, HUANG Wei-xuan, CHEN Long-xuan, CHEN Zi-jian. Rapid Detection of Acetohydroxamic Acid in Wheat Flour and Its Products by Visual Colorimetric Method Coupled with Smartphone Imaging Technology[J/OL]. Journal of Instrumental Analysis, 2026, 1-10.DOI: 10.12452/j.fxcsxb.26042601.
Rapid Detection of Acetohydroxamic Acid in Wheat Flour and Its Products by Visual Colorimetric Method Coupled with Smartphone Imaging Technology
Based on the specific complexation chromogenic reaction between acetohydroxamic acid (AHA) and Fe
3+
, which forms a 3:1 five-membered chelate with a maximum absorption wavelength of 495 nm, a color signal transition from yellow to red was achieved for the q
uantitative analysis of AHA. Two colorimetric detection methods (absorption spectrometry and smartphone imaging) were established for the rapid quantitative determination of AHA in wheat flour and its products. The optimal conditions were determined to be a pH of 7.0, Fe
3+
concentration of 6.25 mmol/L, and reaction volume of 250 μL. The absorbance was measured at 495 nm, and the calibration curve showed good linearity in the range of 0–4 mmol/L (0–300 mg/L) with a coefficient of determination (r
2
) of 0.994 and a limit of detection (LOD) of 0.14 mmol/L (10.36 mg/L). The smartphone imaging method acquires the RGB values of the microplate via a website. After optimization by lg(
x
+
n
) logarithmic transformation, the G channel value exhibited the best linear relationship with AHA mass concentration (r
2
= 0.994), with an LOD of 0.11 mmol/L (8.63 mg/L). The proposed method exhibited excellent anti-interference activity against seven common illegal whitening agents in wheat flour and wheat flour products. Spiked recovery experiments showed that the recoveries ranged from 80.9% to 114%, with relative standard deviations(RSDs) of 0.65% to 12%. Among the 12 batches of commercially available samples, AHA was detected in only one batch of bulk wheat flour, and the results were in good agreement with those of high-performance liquid chromatography. The smartphone imaging method does not require a fixed dark-box device, making it more suitable for rapid on-site screening at the grassroots level.
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references
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