Journal
JOURNAL OF FOOD SCIENCE
Volume 81, Issue 10, Pages C2344-C2351Publisher
WILEY
DOI: 10.1111/1750-3841.13394
Keywords
FeTsPc; LbL film; polyphenol sensor; tea samples
Categories
Funding
- FAPESP
- CNPq
- CAPES
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Polyphenols have attracted attention due to their antioxidant capacity and beneficial effects to health. Therefore, fast, inexpensive, and efficient methods to discriminate and to quantify polyphenols are of interest for food industry. In this paper, Layer-by-Layer films of poly(allylamine hydrochloride) and iron tetrasulfonated phthalocyanine were employed as sensor for determination of polyphenols in green tea (camellia sinensis), and green and roasted mate teas (ilex paraguariensis). The polyphenol sensor was tested in catechol standard solution by differential pulse voltammetry (DPV), reaching a limit of detection of 1.76x10(-7) mol/L. The determination of polyphenols in the tea samples was obtained by analytical curve and catechol standard addition using electrochemical techniques. Projection techniques (information visualization) were applied to the DPV results of the tea samples and a pattern of separation following the phenolic content was obtained. The results support the application of the sensor in fast classification of beverages according to their polyphenol content. Practical Application Results reported in this work suggest that the proposed methodology, electrochemical sensors based on iron tetrassulfonated phthalocyanine, can be improved and used by food industry to classify beverages according to their polyphenols content.
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