Total protein content was determined by the Kjeldahl method. The method was performed according to method 981.10 of the AOAC [6]. All the insect samples were analyzed twice using a steam distillation system (Vapodest 20, C. Gerhardt GmbH & Co. KG, Königswinter, Germany). The amount of obtained total nitrogen of the insect samples was multiplied by species-specific conversion factor of 4.76 as recommended by Janssen et al. [7] in order to not overestimate the total protein content.
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