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Molecules 2014, 19(10), 16640-16655; doi:10.3390/molecules191016640

Influence of Sulfur Fumigation on the Chemical Constituents and Antioxidant Activity of Buds of Lonicera japonica

1
Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing 100700, China
2
National Engineering Laboratory for Quality Control Technology of Chinese Herbal Medicine, Beijing 100700, China
3
Jiangsu Kanion Pharmaceutical Co. Ltd., Lianyungang 222001, China
*
Authors to whom correspondence should be addressed.
Received: 6 September 2014 / Revised: 7 October 2014 / Accepted: 9 October 2014 / Published: 15 October 2014
(This article belongs to the Section Natural Products)
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Abstract

Lonicera japonica flos is widely used as a pharmaceutical resource and a commonly-employed ingredient in healthy food, soft beverages and cosmetics in China. Sometimes, sulfur fumigation is used during post-harvest handling. In this study, a comprehensive comparison of the chemical profile between sun-dried and sulfur-fumigated samples was conducted by HPLC fingerprints and simultaneous quantification of nine constituents, including secologanic acid, along with another eight usually-analyzed markers. Secologanic acid was destroyed, and its sulfonates were generated, whereas caffeoylquinic acids were protected from being oxidized. The residual sulfur dioxide in sulfur-fumigated samples was significantly higher than that in sun-dried samples, which might increase the potential incidence of toxicity to humans. Meanwhile, compared with sun-dried samples, sulfur-fumigated samples have significantly stronger antioxidant activity, which could be attributed to the joint effect of protected phenolic acids and flavonoids, as well as newly-generated iridoid sulfonates. View Full-Text
Keywords: Lonicera japonica Thunb.; sulfur fumigation; sulfur dioxide residual; secologanic acid; antioxidant activity Lonicera japonica Thunb.; sulfur fumigation; sulfur dioxide residual; secologanic acid; antioxidant activity
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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

Guo, A.-L.; Chen, L.-M.; Wang, Y.-M.; Liu, X.-Q.; Zhang, Q.-W.; Gao, H.-M.; Wang, Z.-M.; Xiao, W.; Wang, Z.-Z. Influence of Sulfur Fumigation on the Chemical Constituents and Antioxidant Activity of Buds of Lonicera japonica. Molecules 2014, 19, 16640-16655.

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