期刊
FOOD CHEMISTRY
卷 340, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2020.128156
关键词
Ammonia; Berthelot reaction; Red and blue indophenol species; Liquid phase microextraction; Micro-spectrophotometry; Water; Milk; Cheese and beer samples
资金
- Department of Science and Technology, Government of India, New Delhi [SR/WOS-B/658/2016]
The Berthelot reaction for ammonia was studied with the aim of miniaturization and addressing interferences in food and water samples. Various microextraction techniques and colorimetric determination were used to achieve selectivity and high sensitivity in complex matrices for ammonia detection.
The Berthelot reaction for ammonia is revisited with the aim of miniaturization and addressing interferences as encountered with food and water samples. Headspace single drop microextraction of ammonia in phosphoric acid served to attain selectivity in complex matrices, and liquid-liquid microextraction of red or blue indophenol species into 1-octanol-isooctane (60:40, v/v) resulted into high sensitivity. Fiber-optics-based cuvetteless microspectrophotometry has been used for colorimetric determination on microliter volumes of extract. The linear dynamic range, limit of detection and enrichment factor have been found to be 0.2-3 mg kg(-1), 0.14 mg kg(-1) and 38, respectively, measuring red species for milk, cheese and beer (4.9-5.5% error; 4.8-6.3% RSD; n = 5); and 5-400 mu g L-1, 0.4 mu g L-1 and 137, respectively, measuring blue species for water samples (3.3-5.7% error; 3.6-6.8% RSD; n = 5). A plausible reaction scheme has been proposed for nitroprusside catalysis in indophenol reaction.
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