Starch saccharification and fermentation of uncooked sweet potato roots for fuel ethanol production

Zhang, Peng; Chen, Caifa; Shen, Yanhu; Ding, Tielin; Ma, Daifu; Zhang, Hua; Sun, Dongxu

doi:10.1016/j.biortech.2012.10.166

Cited by 44 publications

(24 citation statements)

References 12 publications

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“…The ethanol yield obtained from this process for cassava was lower than that in previous reports on ethanol fermentation from uncooked starch substrates e.g. triticale and wheat (80-85% yield with the initial dried solid of 28-30%) [35], and sweet potato roots (87% yield) using enzymes from a mutagenized strain of Aspergillus niger [36]. The digestion of starch granules is a complex process involving diffusion of the enzymes toward the granules, the adsorption of the enzymes to the granules and hydrolysis of starch chains.…”

Section: Vhg Fermentation Of Ethanol By Thermal and Non-thermal Ssf Pcontrasting

confidence: 78%

Viscosity reduction of cassava for very high gravity ethanol fermentation using cell wall degrading enzymes from Aspergillus aculeatus

Poonsrisawat

Wanlapatit

Paemanee

et al. 2014

Process Biochemistry

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Section: Vhg Fermentation Of Ethanol By Thermal and Non-thermal Ssf Pcontrasting

confidence: 78%

Viscosity reduction of cassava for very high gravity ethanol fermentation using cell wall degrading enzymes from Aspergillus aculeatus

Poonsrisawat

Wanlapatit

Paemanee

et al. 2014

Process Biochemistry

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“…Sweet potato has recently been considered as a promising substrate for fuel ethanol production because it has a higher starch yield per unit of cultivated land than grains and displays strong adaptability (Zhang et al 2013). Much research on sweet potato has thus focused on enhancing starch yield in the tuberous roots.…”

Section: Discussionmentioning

confidence: 99%

Isolation and characterization of cDNAs and genomic DNAs encoding ADP-glucose pyrophosphorylase large and small subunits from sweet potato

et al. 2015

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Interactions between different SSs and LSs were confirmed by a yeast two-hybrid experiment. Our findings provide comprehensive information about AGPase gene sequences, structures, expression profiles, and subunit interactions in sweet potato. The results can serve as a foundation for elucidation of molecular mechanisms of starch synthesis in tuberous roots, and should contribute to future regulation of starch biosynthesis to improve sweet potato starch yield.

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“…It was only in the late 1990s, following a long period of neglect, that Brazilian governments initiated policies designed to favour smallholder farmers. It should be noted, however, that none of the aforementioned policies seeks to promote landrace maize or sweet potato ethanol production, despite their great potential (see Section 4) [57][58][59][60][61].…”

Section: Policiesmentioning

confidence: 99%

Understanding the Implications of Alternative Bioenergy Crops to Support Smallholder Farmers in Brazil

et al. 2020

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Smallholders constitute more than three quarters of the world’s farmers, and despite their numbers, they commonly lack opportunities to advance their development status. Bioenergy production and consumption can help sustain smallholders’ energy needs and generate employment and income, but it also raises concerns over social justice and equity, especially where crops used for bioenergy could also be used for food. This perspective paper is grounded in a literature review related to three different crops in Brazil: sugarcane, landrace maize and sweet potato. It seeks to determine if these crops offer the potential to support smallholder farmers’ development in a more equitable way, focusing on opportunities for their use in bioenergy. We review the literature to identify policies shaping the smallholder development context in relation to these crops, assessing whose knowledge informs policy and institutional decision making, and highlighting the policy attention afforded to the different crops from different sectors. We further evaluate the literature on each crop in relation to water use and calorific value (i.e., food and energy). Our review indicates that while sugarcane has received the most policy and institutional attention, its development is largely anchored in research and development investments that support large-scale commercial farms and agri-businesses. Smallholders have not benefited or had the opportunity to engage in relevant policy decision making for sugarcane cultivation. At the same time, smallholders hold valuable untapped knowledge on the cultivation of sweet potato and landrace maize, both of which have the potential to generate development opportunities for smallholders. Our review suggests that the environmental impact of landrace maize and sweet potato in terms of water use is significantly lower than sugarcane, while they can generate more calories for energy or food consumption and offer diversification opportunities. Despite that these alternative crops offer considerable untapped potential to support rural development, more research is still needed to harness these benefits. Changes are needed to address inequities in policies, institutions and the types of knowledge informing decision making. Such changes need to afford smallholder farmers greater recognition and participation in decision making, so that the distribution of benefits from the three study crops can reach them to support their development better.

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Starch saccharification and fermentation of uncooked sweet potato roots for fuel ethanol production

Cited by 44 publications

References 12 publications

Viscosity reduction of cassava for very high gravity ethanol fermentation using cell wall degrading enzymes from Aspergillus aculeatus

Viscosity reduction of cassava for very high gravity ethanol fermentation using cell wall degrading enzymes from Aspergillus aculeatus

Isolation and characterization of cDNAs and genomic DNAs encoding ADP-glucose pyrophosphorylase large and small subunits from sweet potato

Understanding the Implications of Alternative Bioenergy Crops to Support Smallholder Farmers in Brazil

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