Optimization of the effect of gamma radiation on textural properties of different varieties of potato (Kufri Chandramukhi and Kufri Jyoti) and mango (Langra and Fazli) during storage by response surface methodology

Response surface methodology was employed to study the effects of Gamma radiation and storage time on textural properties of different varieties of potato (Kufri Chandramukhi and Kufri Jyoti) and mango (Langra and Fazli). The radiation doses varied from 0.04kGy to 3kGy for potato and from 0.25kGy to 10kGy for mango. Storage was upto 6 months in potato and for 10 days in mango. Optimization of the regression equation revealed that for both potato and mango, the maximum peak force was at 0 radiation exposures and without storage. Peak forces decreased significantly with increasing doses and storage time exhibiting textural softening for radiation induced cellular damages together with biochemical and physiological changes associated with sprouting of potato and ripening in mango. The 3D response surface graphs established the same phenomena. Scanning electron microscopic photographs of semi dried potato and mango at 200x magnification also reinforced the facts. Industrial relevance: Potato is an important food crop of the world and a yearlong supply of potato is required to meet the consumer demand and so the effective storage of potato is important. The major problem of potato storage is sprouting which makes potato tubers unacceptable to the consumers. Gamma irradiation pretreatment successfully inhibits sprouting but creates textural damages. This paper explores the optimization of the effects of gamma radiation on textural properties of potato with varying radiation doses and storage time by applying response surface methodology. This optimization values will be beneficial for commercial application of gamma radiation in potato preservation. (C) 2014 Elsevier Ltd. All rights reserved.