Antibacterial activity of essential oils and their active components from Thai spices against foodborne pathogens

Abstract

As the popularity of organic food especially fresh vegetables is increasing, it is a common practice to replace chemical fertilizers by manure which leads to high bacterial contamination. Some essential oils such as Thymus vulgaris (thyme) and Ocimum basilicum (basil) oils reduce spoilage flora and foodborne pathogens when used in washing water. This information prompted us to search for effective essential oils from Thai spices for vegetable washing products. Seven out of nine essential oils; fingerroot (Boesenbergia pandurata (Roxb.) Schltr.), galanga (Alpinia galanga (L.) Willd.), holy basil (Ocimum tenuiflorum L.), makrut leaf, makrut peel (Citrus hystrix DC.), sweet basil (O. basilicum L.), and turmeric (Curcuma longa L.) oils showed antibacterial activity. The active components were identified by thin layer chromatography (TLC) bioautography, preparative TLC, and gas chromatography-mass spectrometry. The results indicated that the active components were major components of the oils. The essential oils exhibited higher potency than their active components suggesting that the whole essential oils were more suitable than the pure compounds for product development.

Antimicrobial Activities of Phenolic Extracts Derived from Seed Coats of Selected Soybean Varieties

“…Natural antimicrobials have started slowly replacing addition of traditional antimicrobials such as different antibiotics to food and food products, due to increasing consumer awareness (Cetin‐Karaca and Newman ). So, there is an increasing demand to investigate the inhibitory effects of plant‐derived phenolics on different foodborne pathogens (Phanthong and others ). The objective of the present study was to determine the effect of the phenolic extracts from the seed coats of selected colored soybean cultivars on the growth of foodborne pathogens, Salmonella Typhimurium, E. coli O157:H7, and Campylobacter jejuni , in broth‐cultures as well as on chicken skin.…”

Antimicrobial efficacy of plant phenolic compounds against Salmonella and Escherichia Coli

“…Although the antimicrobial activity of some PCs including: thymol (Lambert et al, 2001;Santas et al, 2010), eugenol (Phanthong, Lomarat, Chomnawangb, & Bunyapraphatsaraa, 2013), carvacrol (Lambert et al, 2001;Santas et al, 2010), quercetin (Yao et al, 2011) and myricetin (Puupponen-Pimia et al, 2001) has been previously reported, the response after the long term exposure was not reported and there are still many unexplored sources. Moreover, thymoquinone and xanthohumol have not been included in antimicrobial studies and antimicrobial activity of chlorogenic acid, curcumin, (À ) epicatechin, eugenol, myricetin and rutin have not been reported broadly on pathogenic Salmonella and E. coli.…”

Antimicrobia activity of garlic (Allium sativum L.) and holy basil (Ocimum sanctum L.) essential oils applied by liquid vs. vapour phases

“…cereus , E . coli , S. aureus and S. typhimurium (Phanthong et al ., ). Other than inhibiting bacteria, Kumar et al .…”