Abstract
The quality of dried distillers’ grain (DDG) is of great importance, and due to concerns regarding drying efficiency, various drying methods have been proposed. The objective of this study was to evaluate the protein content and antioxidant activity of DDG using two different drying media: (1) hot air at 150°C and (2) and superheated steam (SS) at 150°C. The results were compared to a reference sample dried at near ambient air temperature of 30°C. Protein content ranged from 15.1 to 16.4% wb for all samples. With respect to phenolic content, ethanolic extraction (3.1–12.9 mg GAE/g) was more effective than aqueous extraction (0.87–2.9 mg GAE/g). The DDG samples dried with SS had the highest phenolic contents among the analyzed samples (p < 0.05). Antioxidant activity ranged between 0.32 and 0.44 mg Trolox/g for aqueous extracts and 0.54–0.57 mg Trolox/g for ethanolic extracts. The results indicate that SS drying can be a suitable method to dry distillers’ spent grain without the adverse effect on protein and phenolic contents.
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