1.肇庆学院 食品与制药工程学院,广东 肇庆 526061
2.农业农村部农产品质量安全风险评估实验室(肇庆),广东 肇庆 526061
3.香港城市大学 工学院 电机工程系,香港 999077
陈子键,博士,讲师,研究方向:食品安全快速检测,E-mail: chenzijian@zqu.edu.cn
收稿:2026-04-26,
修回:2026-06-24,
录用:2026-06-25,
网络首发:2026-08-19,
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黄霭珺, 黄伟璇, 陈龙轩, 陈子键. 可视化比色法结合智能手机成像技术快速检测小麦粉及其制品中的乙酰氧肟酸[J/OL]. 分析测试学报, 2026,1-10.
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.
黄霭珺, 黄伟璇, 陈龙轩, 陈子键. 可视化比色法结合智能手机成像技术快速检测小麦粉及其制品中的乙酰氧肟酸[J/OL]. 分析测试学报, 2026,1-10. DOI: 10.12452/j.fxcsxb.26042601.
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.
基于乙酰氧肟酸(AHA)可与 Fe
3+
形成3:1五元螯合物的特异性络合显色反应(最大吸收波长495 nm),进而实现 AHA 定量分析的颜色信号从黄色到红色的转变,建立了小麦粉及其制品中AHA快速定量分析的吸光度法和智能手机成像法两种检测方法。优化后的最佳条件为pH 7.0、Fe
3+
浓度6.25 mmol/L、反应体积250 μL。吸光度法在0~4 mmol/L(0~300 mg/L)范围内线性良好(r
2
=0.994),检出限为0.14 mmol/L(10.36 mg/L);智能手机成像法通过在线网站读取微孔板RGB值,经lg(
x
+n)对数转换优化后,G通道值与AHA质量浓度呈最佳线性关系(r
2
=0.994),检出限为0.11 mmol/L(8.63 mg/L)。方法对7种常见非法增白剂具有优异抗干扰能力,加标回收率为80.9%~114%,相对标准偏差为0.65%~12%。12批次市售样品中仅1批次散装小麦粉检出AHA,检测结果与液相色谱法一致。所构建的智能手机成像法无需固定化暗盒,更适用于基层现场快速筛查。
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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