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From laboratory to industrial storage - Translating volatile organic compounds into markers for assessing garlic storage quality

Ludlow, Richard A., Evans, Gareth, Graz, Michael, Gracia, Marti, Castillo Martinez, Puri, Rogers, Hilary J. and Muller, Carsten T. 2022. From laboratory to industrial storage - Translating volatile organic compounds into markers for assessing garlic storage quality. Postharvest Biology and Technology 191 , 111976. 10.1016/j.postharvbio.2022.111976

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Abstract

Garlic (Allium sativum L.) has long been grown for its culinary and health-promoting qualities. The seasonal nature of garlic cropping requires that bulbs be stored for many months after harvest to ensure a year-round supply. During this time, quality is known to deteriorate, and efforts have been made to improve the longevity of stored bulbs. Cold temperatures within the stores prolong shelf life, but fine temperature control is needed to avoid freezing damage or cold induced stress. Here, quality traits (alliinase activity, firmness, and water content) are measured in response to a 96 h − 5 °C cold stress, to simulate the effect of non-isothermic temperature control in a − 1.5 °C warehouse. Volatile organic compounds (VOCs) are measured by thermal desorption gas chromatography time of flight mass spectrometry to identify markers of non-isothermic storage in garlic. 129 compounds were putatively identified and four (L-lactic acid, 2,6-dimethylhetpadecane, 4-methyldodecane, and methylcyclopentane) showed high predictive accuracy for cold stress. VOCs were also sampled directly from a cold storage facility and the whole profile discriminated between sampling time points. Five VOCS were highly predictive for storage time in the warehouse but were different to VOCs previously shown to discriminate between storage times in a laboratory setting. This indicates the need for realistic warehouse experiments to test quality markers.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Publisher: Elsevier
ISSN: 0925-5214
Date of First Compliant Deposit: 19 May 2022
Date of Acceptance: 11 May 2022
Last Modified: 21 Jun 2022 09:40
URI: https://orca.cardiff.ac.uk/id/eprint/149747

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