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Food and Bioprocess Technology

, Volume 4, Issue 6, pp 1050–1059 | Cite as

Effects of Tropical Citrus Essential Oils on Growth, Aflatoxin Production, and Ultrastructure Alterations of Aspergillus flavus and Aspergillus parasiticus

  • Kadsarin Rammanee
  • Tipparat Hongpattarakere
Original Paper

Abstract

Ethyl acetate extracts and hydrodistillated essential oils from five cultivars of tropical citrus epicarps were evaluated for their inhibitory activities against Aspergillus fumigatus, Aspergillus niger, Aspergillus flavus, Aspergillus parasiticus, and Penicillium sp. using disk diffusion and broth microdilution assays. Essential oils prepared from kaffir lime (Citrus hystrix DC) and acid lime (Citrus aurantifolia Swingle) epicarps exhibited stronger antifungal activity to all fungi than their ethyl acetate extracts with minimum inhibitory concentration and minimum fungicidal concentration values of 0.56 and 1.13 mg/ml (dry matter), respectively, against aflatoxin-producing A. flavus and A. parasiticus. The dominant components of the essential oil from kaffir lime were limonene, citronellol, linalool, o-cymene, and camphene, whereas limonene and p-cymene were major components of acid lime essential oil. Pure limonene, citronellal, and citronellol were five to six times less fungicidal than the natural essential oils, indicating the synergistic activity of many active compounds present in the oils. Kaffir and acid lime essential oils significantly reduced aflatoxin production of A. flavus and A. parasiticus, particularly lime essential oil, which completely inhibited growth and aflatoxin production of A. flavus at the concentration of 2.25 mg/ml. Target cell damage caused by acid lime essential oil was investigated under transmission electron microscopy. Destructive alterations of plasma and nucleus membrane, loss of cytoplasm, vacuole fusion, and detachment of fibrillar layer were clearly exhibited in essential-oil-treated cells.

Keywords

Citrus essential oils Aspergillus flavus Aspergillus parasiticus Aflatoxin Antifungal TEM 

Notes

Acknowledgements

This research was funded by the Graduate School and Nutraceutical and Functional Food Research and Development Center, Faculty of Agro-Industry, Prince of Songkla University. We express great appreciation to the Scientific Equipment Center, Prince of Songkla University for their electron microscopy facility and excellent TEM technical assistance.

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Copyright information

© Springer Science + Business Media, LLC 2011

Authors and Affiliations

  1. 1.Department of Industrial Biotechnology, Faculty of Agro-IndustryPrince of Songkla UniversitySongkhlaThailand

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