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Open AccessArticle

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.
Molecules 2014, 19(10), 16640-16655; https://doi.org/10.3390/molecules191016640
Received: 6 September 2014 / Revised: 7 October 2014 / Accepted: 9 October 2014 / Published: 15 October 2014
(This article belongs to the Section Natural Products Chemistry)
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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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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