Energy consumption evaluation of fuel bioethanol production from sweet potato

Ferrari, Mario Daniel; Guigou, Mairan; Lareo, Claudia

doi:10.1016/j.biortech.2013.03.045

Cited by 47 publications

(25 citation statements)

References 27 publications

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“…The sweet potato tuberous roots contain simply fermentable sugars such as glucose, fructose, and sucrose; minimal quantities of fibers and proteins; and they are rich in starch. These nutritional characteristics are also of interest to the alcohol industry; however, sweet potatoes selected for ethanol production must have a higher content of starch and good agricultural yields (Ferrari et al ., ; Wang et al ., ). Therefore, national programs of sweet potato genetic improvement for bioenergy production that seek for varieties with high yields of dry biomass and starch are getting more common in developing countries (Ferrari et al ., ).…”

Section: Introductionmentioning

confidence: 99%

“…These nutritional characteristics are also of interest to the alcohol industry; however, sweet potatoes selected for ethanol production must have a higher content of starch and good agricultural yields (Ferrari et al ., ; Wang et al ., ). Therefore, national programs of sweet potato genetic improvement for bioenergy production that seek for varieties with high yields of dry biomass and starch are getting more common in developing countries (Ferrari et al ., ). Despite the constantly rising number of studies concerning the importance of sweet potato for ethanol production (Srichuwong et al ., ; Ziska et al ., ; Lee et al ., ; Duvernay et al ., ), almost nothing can be found in the literature about the bacterial communities present in the soil adhering to tuberous roots (tuber rhizosphere) of sweet potato genotypes with different starch concentrations in their tuberous roots.…”

Section: Introductionmentioning

confidence: 99%

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Plant age and genotype affect the bacterial community composition in the tuber rhizosphere of field-grown sweet potato plants

Marques

Silva

Vollú

et al. 2014

FEMS Microbiol Ecol

147

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The hypothesis that sweet potato genotypes containing different starch yields in their tuberous roots can affect the bacterial communities present in the rhizosphere (soil adhering to tubers) was tested in this study. Tuberous roots of field-grown sweet potato of genotypes IPB-149 (commercial genotype), IPB-052, and IPB-137 were sampled three and six months after planting and analyzed by denaturing gradient gel electrophoresis (DGGE) and pyrosequencing analysis of 16S rRNA genes PCR-amplified from total community DNA. The statistical analysis of the DGGE fingerprints showed that both plant age and genotypes influenced the bacterial community structure in the tuber rhizosphere. Pyrosequencing analysis showed that the IPB-149 and IPB-052 (both with high starch content) displayed similar bacterial composition in the tuber rhizosphere, while IPB-137 with the lowest starch content was distinct. In comparison with bulk soil, higher 16S rRNA gene copy numbers (qPCR) and numerous genera with significantly increased abundance in the tuber rhizosphere of IPB-137 (Sphingobium, Pseudomonas, Acinetobacter, Stenotrophomonas, Chryseobacterium) indicated a stronger rhizosphere effect. The genus Bacillus was strongly enriched in the tuber rhizosphere samples of all sweet potato genotypes studied, while other genera showed a plant genotype-dependent abundance. This is the first report on the molecular identification of bacteria being associated with the tuber rhizosphere of different sweet potato genotypes.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Plant age and genotype affect the bacterial community composition in the tuber rhizosphere of field-grown sweet potato plants

Marques

Silva

Vollú

et al. 2014

FEMS Microbiol Ecol

147

View full text Add to dashboard Cite

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“…The fermentation efficiency influences energy consumption during the process of alcohol generation, indicating the need of industrial yeast with good performance during fermentation (Ferrari et al, 2013). A pilot test was performed until the best results were obtained.…”

Section: Resultsmentioning

confidence: 99%

Produção de álcool de batata-doce variando as condições de fermentação e hidrólise

Santos

Guerra

Resende

et al. 2020

RSD

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Bioethanol is a renewable fuel as an alternative source of energy of worldwide importance.The present study aimed to evaluate alcohol production from sweet potato, under varying reaction conditions for fermentation and hydrolysis. A genotype was selected to obtain dried flour and processed by acid hydrolysis and enzymatic hydrolysis with α-amilase and amiloglucosidase. The experiment was carried out in a completely randomized block design Research, Society and Development, v. 9, n. 2, e168922201, 2020 (CC BY 4.0) | ISSN 2525-3409 | DOI: http://dx.doi.org/10.33448/rsd-v9i2.2201 2 with three central point replicates combined with response surface methodology. The variables were pH, temperature and fermentation time. The alcohol content was determined by distillation with subsequent spectrophotometric analysis. Raw materials were characterized according to moisture, reducing sugars and starch, and 4.13%, 4.04% and 71.80% were obtained, respectively. Acid hydrolysis showed higher alcohol percentages of distilled samples. The highest values for acid hydrolysis and enzymatic hydrolysis in fermentations were 26.42% and 25.04%, respectively, carried out at pH 5.0 and 36°C for 5 days. The fermentation time was the most important variable, with higher and significant values for both types of hydrolysis. Acid hydrolysis presented higher potential for alcoholic production than enzymatic hydrolysis in sweet potato fermentation. ResumoO bioetanol é um combustível renovável como fonte alternativa de energia de importância mundial. O presente estudo teve como objetivo avaliar a produção de álcool a partir de batatadoce, sob diferentes condições de reação para fermentação e hidrólise. Um genótipo foi selecionado para obtenção de farinha seca e processado por hidrólise ácida e hidrólise enzimática com α-amilase e amiloglucosidase. O experimento foi realizado em delineamento de blocos completamente casualizados com três repetições de pontos centrais, combinadas com a metodologia da superfície de resposta. As variáveis foram pH, temperatura e tempo de fermentação. O teor de álcool foi determinado por destilação com subsequente análise espectrofotométrica. As matérias-primas foram caracterizadas quanto à umidade, açúcares redutores e amido, obtendo-se 4,13%, 4,04% e 71,80%, respectivamente. A hidrólise ácida mostrou maiores porcentagens de álcool nas amostras destiladas. Os maiores valores de hidrólise ácida e hidrólise enzimática nas fermentações foram 26,42% e 25,04%, respectivamente, realizados a pH 5,0 e 36 ° C por 5 dias. O tempo de fermentação foi a variável mais importante, com valores mais altos e significativos para os dois tipos de hidrólise. A hidrólise ácida apresentou maior potencial de produção alcoólica do que a hidrólise enzimática na fermentação da batata-doce.Palavras-chave: Ipomoea batatas L.; Saccharomyces cerevisiae; Hidrólise; Bioetanol. ResumenEl bioetanol es un combustible como fuente alternativa de energía de importancia mundial. El presente estudio tuvo como objetivo evaluar la producción de alcohol a parti...

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“…The best ratio of dry matter to total water to work with sweet potato was 0.2 kg dry sweet potato/kg water. It shows significant reduction in energy consumption (Ferrari et al 2013).…”

Section: Ethanol From Starchy Biomassmentioning

confidence: 99%