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

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 agains...

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Bibliographic Details
Published in:Fitoterapia 2012-04, Vol.83 (3), p.545-553
Main Authors: Rangkadilok, Nuchanart, Tongchusak, Songsak, Boonhok, Rachasak, Chaiyaroj, Sansanee C., Junyaprasert, Varaporn B., Buajeeb, Waranun, Akanimanee, Jaratluck, Raksasuk, Thida, Suddhasthira, Theeralaksna, Satayavivad, Jutamaad
Format: Article
Language:English
Subjects:
antibacterial properties
antifungal properties
Candida
Candida albicans
Candida krusei
Candida parapsilosis
Corilagin
Cryptococcus neoformans
Dimocarpus longan
Ellagic acid
gallic acid
Longan seed
Staphylococcus aureus
Streptococcus mutans
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Summary: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=500–4000μg/ml) as it contained higher contents of ellagic acid and gallic acid than Edor (MIC=1000–8000μg/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. [Display omitted]
ISSN:0367-326X
DOI:10.1016/j.fitote.2011.12.023