In vitro antifungal activities of longan (Dimocarpus longan Lour.) seed extract

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• 作者：Nuchanart Rangkadilok^a ; ^b ; ¹ ; Songsak Tongchusak^c ; ¹ ; Rachasak Boonhok^c ; Sansanee C. Chaiyaroj^c ; Varaporn B. Junyaprasert^d ; Waranun Buajeeb^e ; Jaratluck Akanimanee^a ; Thida Raksasuk^a ; Theeralaksna Suddhasthira^e ; Jutamaad Satayavivad^a ; ^b ; ^{jutamaad@cri.or.th}
• 关键词：Longan seed ; Ellagic acid ; Corilagin ; Dimocarpus longan ; Candida ; Cryptococcus neoformans
• 刊名：Fitoterapia
• 出版年：2012
• 期刊代码：35_0367326x
• 类别：ch
• 出版时间：April, 2012
• 卷：83
• 期：3
• 页码：545-553
• 文件大小：628 K

摘要

Longan, Dimocarpus longan Lour., contains polyphenolic compounds which exhibit several pharmacological properties. This study aims to evaluate antifungal activities of longan fruit extract in comparison to its active compounds. The results showed that longan seed exhibited antifungal activity against the opportunistic yeasts (Candida species and Cryptococcus neoformans). In contrast, longan pulp and whole fruit did not demonstrate any inhibitory effects. Ellagic acid showed the most potent antifungal activity followed by corilagin and gallic acid, respectively. Ellagic acid inhibited Candida parapsilosis and C. neoformans more effectively than Candida krusei and also some Candida albicans clinical strains. Baidam cultivar possessed higher antifungal activity (MIC = 500-4000 渭g/ml) as it contained higher contents of ellagic acid and gallic acid than Edor (MIC = 1000-8000 渭g/ml). For antibacterial activity, only corilagin and gallic acid possessed weak to moderate inhibitory effects against Staphylococcus aureus and Streptococcus mutans, respectively. Longan seed was then applied in the oral care products. Longan effervescent granule (5%extract) significantly reduced adhesion of C. albicans to acrylic strips. Mouthwash containing 0.5%extract exhibited good antifungal activity compared to a commercial product. These findings indicated that longan seed extract and its polyphenolic compounds can be used as an antifungal agent in oral care products for the treatment of opportunistic yeast infection.