Black tea is consumed worldwide and is believed to play a role in cancer prevention. Xerophilic aflatoxigenic fungi are highly hazardous contaminants of tea since they are associated with tea quality impairment and human health risk. The present study reports isolation of such xerophilic and aflatoxigenic fungi associated with marketed tea. Twenty different tea samples collected from the local markets of Tamilnadu, India were investigated for fungal contamination. The results indicated contamination by 0.38% Aspergillus flavus. Other common contaminant fungi including Penicillium spp. (0.30%), Pacelomyces spp. (0.14%), and Mucor spp. (0.19%) were also isolated. Amongst the fungi isolated Aspergillus niger ML01 and A. flavus ML02 were found to be xerophilic aflatoxigenic mycoflora. Phylogenetic analysis based on 28S rRNA revealed their close ancestry. The chloroform and acetone extracts of spices Elettaria cardamomum and Syzygium aromaticum exhibited antifungal inhibitory activity on growth and toxin elaboration of both these xerophilic tea contaminants A. niger ML01 and A. flavus ML02. The results advocate the use of these spices plant or their extracts as novel antimicrobials which may add preservation and flavour in marketed tea.

译文

:红茶在全球范围内消费,被认为在预防癌症中起作用。嗜黄曲霉毒素真菌是茶的高度有害污染物,因为它们与茶质量受损和人类健康风险相关。本研究报道了与市售茶相关的这种嗜干性和黄曲霉性真菌的分离。调查了从印度泰米尔纳德邦当地市场收集的20种不同茶叶样品中的真菌污染情况。结果表明被0.38%的黄曲霉污染。其他常见的污染真菌包括青霉菌。 (0.30%),Pacelomyces spp。 (0.14%)和Mucor spp。也分离出(0.19%)。在分离出的真菌中,发现黑曲霉ML01和黄曲霉ML02是嗜干性的黄曲霉毒素性分枝杆菌。基于28S rRNA的系统发育分析揭示了它们的近缘。香料小豆蔻(Elettaria cardamomum)和芳香蒲(Syzygiumaromaticum)的氯仿和丙酮提取物对这些干性茶污染物黑曲霉ML01和黄曲霉ML02的生长和毒素加工均表现出抗真菌抑制活性。结果提倡将这些香料植物或其提取物用作新型抗菌剂,这些抗菌剂可能会增加市售茶的保鲜性和风味。

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