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Appl. Sci. 2017, 7(3), 268; doi:10.3390/app7030268

Hyperspectral Imaging as a Rapid Quality Control Method for Herbal Tea Blends

1
Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa
2
SAMRC Herbal Drugs Research Unit, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa
*
Author to whom correspondence should be addressed.
Academic Editor: Kuanglin Kevin Chao
Received: 11 January 2017 / Revised: 21 February 2017 / Accepted: 1 March 2017 / Published: 8 March 2017
(This article belongs to the Special Issue Applications of Hyperspectral Imaging for Food and Agriculture)
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Abstract

In South Africa, indigenous herbal teas are enjoyed due to their distinct taste and aroma. The acclaimed health benefits of herbal teas include the management of chronic diseases such as hypertension and diabetes. Quality control of herbal teas has become important due to the availability of different brands of varying quality and the production of tea blends. The potential of hyperspectral imaging as a rapid quality control method for herbal tea blends from rooibos (Aspalathus linearis), honeybush (Cyclopia intermedia), buchu (Agathosma Betulina) and cancerbush (Sutherlandia frutescens) was investigated. Hyperspectral images of raw materials and intact tea bags were acquired using a sisuChema shortwave infrared (SWIR) hyperspectral pushbroom imaging system (920–2514 nm). Principal component analysis (PCA) plots showed clear discrimination between raw materials. Partial least squares discriminant analysis (PLS-DA) models correctly predicted the raw material constituents of each blend and accurately determined the relative proportions. The results were corroborated independently using ultra-high performance liquid chromatography coupled to mass spectrometry (UHPLC-MS). This study demonstrated the application of hyperspectral imaging coupled with chemometric modelling as a reliable, rapid and non-destructive quality control method for authenticating herbal tea blends and to determine relative proportions in a tea bag. View Full-Text
Keywords: herbal tea; tea blends; quality control; hyperspectral imaging; chemometrics; rooibos; honeybush; cancer bush; buchu herbal tea; tea blends; quality control; hyperspectral imaging; chemometrics; rooibos; honeybush; cancer bush; buchu
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Djokam, M.; Sandasi, M.; Chen, W.; Viljoen, A.; Vermaak, I. Hyperspectral Imaging as a Rapid Quality Control Method for Herbal Tea Blends. Appl. Sci. 2017, 7, 268.

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