Microbial quality evaluation and effective decontamination of nutraceutically valued lotus seeds by electron beams and gamma irradiation |
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| Authors: | Rajeev Bhat K.R. Sridhar A.A. Karim |
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| Affiliation: | 1. Food Technology Division, School of Industrial Technology, Universiti Sains Malaysia, Penang 11800, Malaysia;2. Microbiology and Biotechnology, Department of Biosciences, Mangalore University, Mangalagangotri, Mangalore 574199, Karnataka, India;1. College of Food Science, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, PR China;2. Fujian Provincial Key Lab of Quality Science and Processing Technology in Special Starch, Fuzhou, Fujian 350002, PR China;1. Faculty of Agro Based Industry, Universiti Malaysia Kelantan, Campus Jeli, Kelantan 17600, Malaysia;2. Faculty of Earth Science, Universiti Malaysia Kelantan, Campus Jeli, Kelantan 17600, Malaysia;1. Leibniz Institute for Agricultural Engineering and Bioeconomy, Max-Eyth-Allee 100, D-14469 Potsdam-Bornim, Germany;2. Bühler AG, Corporate Technology, Gupfenstrasse 5, CH-9240, Uzwil, Switzerland;3. ETH Zurich, Institute of Food, Nutrition and Health, Laboratory of Sustainable Food Processing, Schmelzbergstrasse 9, CH-8092 Zurich, Switzerland |
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| Abstract: | Lotus seeds are nutraceutically valued natural plant produce, which succumbs to microbial contamination, predominantly to toxigenic moulds. Results of the present study revealed seed coat portion to harbor higher proportion of microbial load, particularly fungi than cotyledon portion. Among the mycotoxins analyzed, aflatoxins (B1, B2, G1 and G2) were below detectable limits, while the seeds were devoid of Ochratoxin-A (OTA). Application of different doses of electron beam and gamma irradiation (0, 2.5, 5, 7.5, 10, 15 and 30 kGy) for decontamination purpose revealed significant dose-dependent decrease in the fungal contaminants (P<0.05). However, the contaminant yeasts could survive up to 10 kGy dose, which could be completely eliminated at 15 kGy. From the results obtained, a dose range between 10 and 15 kGy is recommended for complete decontamination, as these doses have also been shown earlier to have minimal effects on nutritional and functional properties of lotus seeds. |
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