Analytical characterisation of the seeds of two tomato varieties as a basis for recycling of waste materials in the food industry
2014
Westphal, Anna | Bauerfeind, Jasmin | Rohrer, Carsten | Ernawita, | Böhm, Volker
The tomato processing industry generates annually high amounts of waste. In respect of a possible recycling of these materials, the seeds of the two tomato varieties Waltinger and Red Currant were analysed. Contents of carotenoids and vitamin E were determined by HPLC. The antioxidant capacity was analysed by several assays (Folin–Ciocalteu, TEAC, ORAC), whereby hydrophilic and lipophilic compounds were gathered separately. The fatty acid profile was determined by gas chromatography. The seeds contained only little amounts of (all-E)-lutein and (all-E)-zeaxanthin. Vitamin E content of Waltinger seeds was nearly twice as high as that of Red Currant seeds with γ-tocopherol as the main vitamer. Red Currant seeds showed always higher antioxidant capacity. Hydrophilic extracts contributed mainly to the total antioxidant capacity. The oil of the seeds was rich in unsaturated fatty acids, especially in linoleic acid. Finally, the results showed that tomato seeds contain some important substances. So concerning waste management, they can serve as a secondary raw material for new products such as edible oil.
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