Lareo Claudia, Ferrari Mario Daniel, Guigou Mairan, Fajardo Lucía, Larnaudie Valeria, Ramírez María Belén, Martínez-Garreiro Jorge
Depto. Bioingeniería, Facultad de Ingeniería, Universidad de la República, J. Herrera y Reissig 565, CP 11300 Montevideo, Uruguay.
Springerplus. 2013 Sep 30;2:493. doi: 10.1186/2193-1801-2-493. eCollection 2013.
The enzymatic starch hydrolysis and bioethanol production from a variety of sweet potato developed for bioenergy purposes (K 9807.1) on the basis of its high starch yields, was studied. Drying at 55°C and 95°C of sweet potato neither affected the sugar content nor the starch enzymatic hydrolysis efficiency. Simultaneous saccharification and ethanol fermentations for dry matter ratio of sweet potato to water from 1:8 to 1:2 (w/v) were studied. Fresh sweet potato and dried at 55°C (flour) were assayed. At ratios of 1:8, similar results for fresh sweet potato and flour in terms of ethanol concentration (38-45 g/L), fermentation time (16 h) and sugar conversion (~ 100%) were found. At higher dry matter content, faster full conversion were observed using flour. A higher ratio than that for fresh sweet potato (1:2.2) did not improve the final ethanol concentration (100 g/L) and yields. High ethanol yields were found for VHG (very high gravity) conditions. The sweet potato used is an attractive raw matter for fuel ethanol, since up to 4800 L ethanol per hectare can be obtained.
对基于高淀粉产量而培育的用于生物能源目的的多种红薯（K 9807.1）进行了酶法淀粉水解和生物乙醇生产的研究。在55°C和95°C下对红薯进行干燥处理，既不影响糖分含量，也不影响淀粉的酶解效率。研究了红薯与水的干物质比从1:8到1:2（w/v）时的同步糖化和乙醇发酵过程。对新鲜红薯和在55°C下干燥的红薯（面粉）进行了测定。在1:8的比例下，新鲜红薯和面粉在乙醇浓度（38 - 45 g/L）、发酵时间（16小时）和糖转化率（~100%）方面得到了相似的结果。在干物质含量较高时，使用面粉观察到更快的完全转化。高于新鲜红薯的比例（1:2.2）并没有提高最终乙醇浓度（100 g/L）和产量。在超高浓度（VHG）条件下获得了高乙醇产量。所使用的红薯是生产燃料乙醇的有吸引力的原料，因为每公顷可获得高达4800升乙醇。
