Optimizing the Use of Garlic Oil as Antimicrobial Agent on Fresh-Cut Tomato through a Controlled Release System
Article first published online: 3 AUG 2010
© 2010 Institute of Food Technologists®
Journal of Food Science
Volume 75, Issue 7, pages M398–M405, September 2010
How to Cite
Ayala-Zavala, J. F. and González-Aguilar, G. A. (2010), Optimizing the Use of Garlic Oil as Antimicrobial Agent on Fresh-Cut Tomato through a Controlled Release System. Journal of Food Science, 75: M398–M405. doi: 10.1111/j.1750-3841.2010.01723.x
- Issue published online: 3 AUG 2010
- Article first published online: 3 AUG 2010
- MS 20090991 Submitted 10/6/2009, Accepted 5/25/2010.
- controlled release;
- fresh-cut tomato;
- garlic oil capsules;
- natural flavor-antimicrobial;
- shelf life
Abstract: Encapsulation of garlic oil (GO) in β-cyclodextrin (β-CD) was undertaken to generate a release system of antimicrobial volatiles and tested on microbial growth and sensory quality of fresh-cut tomato. GO volatile profile was characterized by gas chromatography mass spectrometry and to demonstrate the disadvantages of applying free GO to fresh-cut tomato, the effect of different free oil treatments (0, 50, 100, and 200 μg/100 g) on microbial growth and sensorial quality was tested. The effect of GO capsules (0, 0.25, 0.5, and 1 g/100 g) on microbial growth and sensory quality of tomato was also investigated. Allyl disulfide was the most abundant GO compound identified. The release of volatiles from GO: β-CD capsules (12: 88 [w/w] ratio) was evaluated at 100% relative humidity (RH). Close to 70% of GO volatiles were released from capsules when exposed to 100% RH during 5 wk. The most effective antimicrobial concentrations of free oil (100 and 200 μg/100 g) applied to tomatoes did not present acceptable sensory quality for panelists. Tomato was affected by the highest concentration of GO capsules applied, showing the lowest microbial growth and the highest sensory quality. In this context, successful encapsulation in β-CD could stimulate further interest in the use of GO for the control of microbial growth in fresh-cut tomato.
Practical Application: The present study demonstrated that relative humidity in-package of fresh-cut tomatoes can be used as a trigger to release antimicrobial garlic oil volatiles from β-cyclodextrin capsules, reducing microbial growth and the sensory effect of the treatment caused by the free garlic oil. In this context, successful encapsulation in β-cyclodextrin could stimulate further interest in the use of garlic oil for the control of microbial growth in fresh-cut tomatoes.