Acid hydrolysis of sweet potato for ethanol production

Journal Article · Tue Jan 01 04:00:00 EST 1985 · Biotechnol. Bioeng.; (United States)

DOI:https://doi.org/10.1002/bit.260270316· OSTI ID:6010042

Kim, K; Hamdy, M K

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), Journal Name: Biotechnol. Bioeng.; (United States) Vol. 27:3; ISSN BIBIA
• Country of Publication: United States
• Language: English

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ACID HYDROLYSIS
ALCOHOLS
BIOCONVERSION
BIOSYNTHESIS
CHEMICAL REACTIONS
DATA
DECOMPOSITION
ETHANOL
EXPERIMENTAL DATA
FERMENTATION
FOOD
HYDROLYSIS
HYDROXY COMPOUNDS
INFORMATION
LYSIS
NUMERICAL DATA
ORGANIC COMPOUNDS
PLANTS
POTATOES
PRODUCTIVITY
SOLVOLYSIS
SYNTHESIS
TEMPERATURE EFFECTS
TUBERS
VEGETABLES