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Bioethanol fermentation of clarified sweet sorghum (Sorghum bicolor (L.) Moench) syrups sealed and stored under vegetable oil

Author:
Klasson, K. Thomas K. Thomas, Stephanie A. Boone
Source:
Industrial crops and products 2021 v.163 no. pp. 113330
ISSN:
0926-6690
Subject:
Sorghum bicolor, bacterial contamination, bioethanol, ethanol fermentation, feedstocks, fuel production, soybean oil, sugars, sweet sorghum, syrups, vegetable oil, yeasts
Abstract:
Sweet sorghum represents a readily available renewable carbohydrate feedstock for biofuel production. Generally, the sweet sorghum growing season and window for processing is short and it is often desirable to store a sugar-rich material for future processing. Therefore, we investigated the possibility of storing three different sweet sorghum sugar syrups under a layer of soybean oil; then we investigated subsequent yeast bioethanol fermentation.A layer of oil on the surface of the syrup reduced sugar loss in 30 and 40°Bx syrups, but the loss was still 21–36 %. Storage of 50°Bx syrup resulted in an 11–18 % loss of sugars with or without a surface layer of oil. Elevated levels of lactic and acetic acids, caused by bacterial contamination, almost completely inhibited yeast fermentation; however, when ethanol-producing microorganisms were part of the contamination, stored syrups produced a bioethanol at a yield of 83–91 %, compared to theoretical.
Agid:
7284395
Handle:
10113/7284395