Acid hydrolysis of sweet potato for ethanol production
Studies were conducted to establish optimal conditions for the acid hydrolysis of sweet potato for maximal ethanol yield. The starch contents of two sweet potato cultivars (Georgia Red and TG-4), based on fresh weight, were 21.1 +/- 0.6% and 27.5 +/- 1.6%, respectively. The results of acid hydrolysis experiments showed the following: (1) both hydrolysis rate and hydroxymethylfurfural (HMF) concentration were a function of HCL concentration, temperature, and time; (2) the reducing sugars were rapidly formed with elevated concentrations of HCl and temperature, but also destroyed quickly; and (3) HMF concentration increased significantly with the concentration of HCl, temperature, and hydrolysis time. Maximum reducing sugar value of 84.2 DE and 0.056% HMF (based on wet weight) was achieved after heating 8% SPS for 15 min in 1N HCl at 110/sup 0/C. Degraded 8% SPS (1N HCl, 97/sup 0/C for 20 min or 110/sup 0/C for 10 min) was utilized as substrate for ethanol fermentation and 3.8% ethanol (v/v) was produced from 1400 mL fermented wort. This is equal to 41.6 g ethanol (200 proof) from 400 g of fresh sweet potato tuber (Georgia Red) or an ethanol yield potential of 431 gal of 200-proof ethanol/acre (from 500 bushel tubers/acre).
- Research Organization:
- Univ. of Georgia, Athens
- OSTI ID:
- 6010042
- Journal Information:
- Biotechnol. Bioeng.; (United States), Vol. 27:3
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ETHANOL
BIOSYNTHESIS
POTATOES
ACID HYDROLYSIS
FERMENTATION
EXPERIMENTAL DATA
PRODUCTIVITY
TEMPERATURE EFFECTS
ALCOHOLS
BIOCONVERSION
CHEMICAL REACTIONS
DATA
DECOMPOSITION
FOOD
HYDROLYSIS
HYDROXY COMPOUNDS
INFORMATION
LYSIS
NUMERICAL DATA
ORGANIC COMPOUNDS
PLANTS
SOLVOLYSIS
SYNTHESIS
TUBERS
VEGETABLES
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140504 - Solar Energy Conversion- Biomass Production & Conversion- (-1989)