Features of sweet sorghum juice and their performance in ethanol fermentation

Wu, Xiaorong; Staggenborg, Scott A.; Propheter, Jonathan L.; Rooney, William L.; Yu, Jianming; Wang, Donghai

doi:10.1016/j.indcrop.2009.10.006

Cited by 232 publications

(181 citation statements)

References 27 publications

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“…3b). These results correspond with previously reported ethanol concentrations of 30-35 g/L for P. stipitis fermentation with starch as substrates [23,[31][32][33]. However, S. cerevisiae fermentation with SSV2, KSV8 and KSV3 as substrates yielded 42 g/L, 50 g/L and 45 g/L ethanol, respectively (Fig.…”

Section: Conflict Of Interestsupporting

confidence: 91%

“…These results corresponded to ethanol concentrations of 355 L/t, 421 L/t and 379 L/t respectively (Table 6). Wu et al [32] reported similar ethanol concentration of 360 L/t for de-husked and un-malted sorghum grain. Furthermore, Sheorain et al [33] reported ethanol concentrations of 380-390 L/t for various de-husked and un-malted sorghum grains.…”

Section: Conflict Of Interestmentioning

confidence: 88%

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Bioconversion of degraded husked sorghum grains to ethanol

Nasidi¹,

Agu²,

Deeni³

et al. 2016

Bioethanol

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Efficient starch saccharification is an essential step towards achieving improved ethanol yields by fermentation. Sorghum grains are important starch sources for bioconversion to ethanol. In the present study, disease degraded (spoilt) husked grains from Nigerian sorghum cultivars were obtained from field sites and subjected to bioprocessing to ethanol. The crude husked grains (comprising husks, spikelet, awn, rachis and pubescence materials) were hammer milled and each meal separately mashed with enzyme cocktails comprising amylase, glucanase and protease enzymes. The saccharified worts obtained were then fermented with the yeasts, Saccharomyces cerevisiae and Pichia stipitis (aka Scheffersomyces stipitis), without exogenous nutrient supplementation. Sugars liberated during mashing were determined and it was found that enzymatic hydrolysis of milled sorghum grains was effective in yielding favourable levels of fermentable sugars up to 70g sugar/100g substrate with one particular cultivar (KSV8). Ethanol and carbon dioxide production was measured from subsequent trial fermentations of the sorghum mash and it was found that S. cerevisiae produced ethanol levels equating to 420 L/t that compares very favourably with yields from wheat and barley. Our findings show that crude degraded sorghum grains represent favourable low-cost feedstocks for bioconversion to ethanol with reduced energy input and without additional costs for nutrient supplementation during fermentation. Consequently, our results suggest some economic benefits could be derived from spoilt or degraded sorghum grains.

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Section: Conflict Of Interestsupporting

confidence: 91%

Section: Conflict Of Interestmentioning

confidence: 88%

Bioconversion of degraded husked sorghum grains to ethanol

Nasidi¹,

Agu²,

Deeni³

et al. 2016

Bioethanol

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show abstract

“…Fermentable sugars in sweet sorghum are mainly sucrose, glucose, and fructose (Deesuth et al, 2012). Increasing the juice yield or making proper use of sugars is crucial for realizing the high ethanol yield of sweet sorghum and is of important economical value (Wu et al, 2010). The sweet sorghum stems are well known to have a greater water content and high amounts of sugars that make them exceptionally vulnerable to microbial invasion, resulting in considerable sugar loss and deterioration that would affect the subsequent processing if the stems were stored improperly after harvest .…”

Section: Discussionmentioning

confidence: 99%

Changes in the sugar content of sweet sorghum stems under natural conditions during winter in saline soil of the Yellow River Delta

Yuan

Wang

2018

IOP Conf. Ser.: Earth Environ. Sci.

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Abstract. In order to investigate the maximum storage period during their natural growth state, the sweet sorghum (Sorghum bicolor L. Moench) stems of four cultivars were analyzed to determine changes in contents of water, total sugars, main soluble sugars and the enzyme activity. From early November 2016 to late January 2017, the decrease in the total sugar content and the contents of sucrose, glucose and fructose slowed down, and the enzyme activities (sucrose synthase and sucrose phosphate synthase) involving sucrose metabolism in the stem remained stable. However, these indicators decreased significantly after the end of January 2017. Low temperatures and a dry environment were conducive to the storage of the sweet sorghum stems. During the winter (from early November 2016 to late January 2017) in northern China, the sweet sorghum plants can be stored naturally in the field via regulating sowing dates, which saves a lot of storage space and production costs for bioethanol company.

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“…Free sugars consist mostly of fructose and glucose and to a lesser extent of sorbitol, three monosaccharaides that are easy to ferment into ethanol using standard industrial yeast strains [25]. Extracting these sugars from the straw requires only grinding and boiling, with no need for costly pretreatment or enzymatic treatment for deconstruction.…”

Section: Discussionmentioning

confidence: 99%

Analysis of Wheat Straw Biodiversity for Use as a Feedstock for Biofuel Production

et al. 2015

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Wheat straw is a potential source of feedstock for biofuel production that does not compete with food. We have screened 48 wheat lines from a collection representing a broad range of the biodiversity of wild and domestic wheat. Wheat straw was fractionated into water-soluble and nonsoluble fractions. In the water-soluble fraction (WSF), we found a broad variation in the concentration of free soluble sugars (FSS) and a narrow variation in starch. The FSS fraction could reach levels of reducing sugars as high as 130 g sugar/kg of straw. The analysis of the FSS by ion chromatography indicated that fructose and glucose were the major sugar monomers in this fraction. The composition of the nonsoluble cell wall fraction was determined by both pyrolysis and direct chemical analysis. These analyses showed a limited variation in the lignin or the cellulose fraction. There was a significant degree of variation among wheat lines in the enzymatic saccharification of the straw, following acid pretreatment. Interestingly, the straw from wild wheat had the highest degree of saccharification compared to domestic lines. These findings are of interest for the biofuel industry because they mean that wheat lines can be developed in which a significant amount of free soluble sugars can be easily extracted from straw without the need for costly pretreatment and enzymatic deconstruction. Moreover, the high FSS trait might be combined with the high enzymatic saccharification trait suggesting that wheat lines can be developed with a straw composition better adapted for biofuel production.

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Features of sweet sorghum juice and their performance in ethanol fermentation

Cited by 232 publications

References 27 publications

Bioconversion of degraded husked sorghum grains to ethanol

Bioconversion of degraded husked sorghum grains to ethanol

Changes in the sugar content of sweet sorghum stems under natural conditions during winter in saline soil of the Yellow River Delta

Analysis of Wheat Straw Biodiversity for Use as a Feedstock for Biofuel Production

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