Produção de etanol de segunda geração a partir de caroço de abacate (Persea americana Mill.)

Kowalski, Rafaela Luisa

doi:10.5380/rber.v6i4.49073

Cited by 5 publications

(7 citation statements)

References 1 publication

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“…The characterization of avocado seed reported in this study and by different researchers Kowalski et al (2017). reported a starch yield of 20.10% with a difference of 9.69 % from te present study[71].Correa et al (2019) reported a starch yield of 6.85% which differs by 22. 94 % with the resent study [72].…”

supporting

confidence: 45%

Pilot-scale bioethanol production from the starch of avocado seeds using a combination of dilute acid-based hydrolysis and alcoholic fermentation by Saccharomyces cerevisiae

Caballero-Sanchez

Lázaro-Mixteco

Vargas‐Tah

et al. 2022

Preprint

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Background A processing methodology of raw starch extraction from avocado seeds (ASs) and a sequential hydrolysis and fermentation bioprocess in just a few steps was successfully obtained for the bioethanol production by a single yeast Saccharomyces cerevisiae strain and this research was also to investigate the optimum conditions for the pretreatment of biomass and technical procedures for the production of bioethanol. It successfully resulted in high yields and productivity of all the experiments from the laboratory scale and the pilot plant. Ethanol yields from pretreated starch are comparable with those in commercial industries that use molasses and hydrolyzed starch as raw materials. Results Before the pilot-scale bioethanol production, studies of starch extraction and dilute sulfuric acid-based pretreatment was carefully conducted. The amount of starch extracted from dry and fresh avocado seed was 16.85 g ± 0.34 g and 29.79 ± 3.18 g of dry starch, representing a yield of ∼17 % and 30 %, respectively. After a dilute sulfuric acid pretreatment of starch, the released reducing sugars (RRS) were obtained and the hydrolysate slurries containing glucose (109.79 ± 1.14 g/L), xylose (0.99 ± 0.06 g/L), and arabinose (0.38 ± 0.01 g/L). The efficiency of total sugar conversion was 73.40 %, with a productivity of 9.26 g/L/h. The ethanol fermentation in a 125 mL flask fermenter showed that Saccharomyces cerevisiae (Fali, active dry yeast) produced the maximum ethanol concentration, pmax at 49.05 g/L (6.22% v/v) with a yield coefficient, Yp/s of 0.44 gEthanol/gGlucose, a productivity or production rate, rp at 2.01 g/L/h and an efficiency, Ef of 85.37%. The pilot scale experiments of the ethanol fermentation using the 40-L fermenter were also successfully achieved with essentially good results. The values of pmax, Yp/s, rp, and Ef of the 40-L scale were at 50.94 g/L (6.46% v/v), 0.45 gEthanol/gGlucose, 2.11 g/L/h, and 88.74%, respectively. Because of using raw starch, major by-products, i.e., acetic acid in the two scales were very low, in ranges of 0.88–2.45 g/L, and lactic acid was not produced, which are less than those values in the industries. Conclusion The sequential hydrolysis and fermentation process of two scales for ethanol production using the combination of hydrolysis by utilizing dilute sulfuric acid-based pretreatment and fermentation by a single yeast Saccharomyces cerevisiae strain is practicable and feasible for realistic and effective scale-up strategies of bioethanol production from the starch of avocado seeds.

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supporting

confidence: 45%

Pilot-scale bioethanol production from the starch of avocado seeds using a combination of dilute acid-based hydrolysis and alcoholic fermentation by Saccharomyces cerevisiae

Caballero-Sanchez

Lázaro-Mixteco

Vargas‐Tah

et al. 2022

Preprint

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“…Despite a significant 17.9% loss in cellulose content, enzymatic hydrolysis was successful in converting about 87% of the sugars and the fermentation consumed 81% of the hydrolyzed matter, resulting in 22.34 g TRS per 100 g of coconut fiber. Kowalski et al (2017) studied enzymatic hydrolysis processes in avocado seeds to produce second generation ethanol. The ethanol obtained was characterized and the results showed that the raw material used is excellent for biofuel production, with 1.0579 g/L of starch producing 44 L of ethanol per ton of seed, 33.8% of yield ethanol.…”

Section: Cellulose Sources For Ethanol Productionmentioning

confidence: 99%

Second-generation ethanol: concept, production and challenges

Medeiros¹,

Theophilo²,

Lopes³

et al. 2023

Eclet. Quim.

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The use of biological agents for the large-scale production of biofuels has stood out as successful processes for the advancement of science in the world. The growing exploitation of biomass in the agricultural sector and the emergence of new energy sources generated from food industry waste have become attractive and viable due to the potential and variety of possibilities for using different sources of biomass. The present review was carried out through careful bibliographical research in the literature and in scientific journals for the current discussion of concepts, production methodologies and challenges for the energy sector considering second-generation ethanol (2G ethanol). Several 2G ethanol production methodologies have been implemented as a potential low-cost alternative energy production that follows the principles of Green Chemistry.

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“…Em diversos países, é consumido na forma de espaguetes, saladas, guacamole, pizza, tortas, além de sopas, maionese, molhos e pastas. Na área industrial, o abacate é matéria-prima para a extração de azeite e etanol, visando à produção de biocombustível de primeira ou segunda geração e fabricação de tintas (Daiuto et al, 2014;Oliveira & Santos, 2016;Kowalski et al, 2017).…”

Section: Introductionunclassified

Avaliação de carotenoides e atividade antioxidante da polpa madura do abacate (persea americana mill)

Nascimento

Sousa

Bermúdez

et al. 2021

RSD

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O abacate é um fruto nutritivo da espécie Persea americana Mill, este cultivar híbrido pertence à família botânica Lauraceae e tem sua origem no continente Americano, amplamente produzido no território brasileiro. Embora este fruto tenha um elevado valor nutritivo, pouco se sabe a respeito da sua natureza fitoquímica e propriedades antioxidantes. O objetivo desta pesquisa foi avaliar os teores de carotenoides e a atividade antioxidante na polpa madura de abacate (Persea americana Mill).Foi realizada a extração da polpa do fruto por maceração, as amostras foram analisadas conforme a metodologia descrita na literatura para carotenoides totais, e a atividade antioxidante pelos métodos – ABTS, DPPH E pelo FRAP. a quantificação dos parâmetros fitoquímicos foi realizada por média e desvio padrão. e a avaliação estatística foi determinada por meio da análise de variância e comparação pelo teste de Tukey com nível de significância p < 0,05. os resultados apontam que a polpa do abacate é rica em carotenoides, principalmente α-caroteno, cantaxantina, β-criptoxantina, zeaxantina, β-caroteno e β- zeacaroteno, ao passo que o fitoflueno apareceu em pequena quantidade (4,81 μg de β-caroteno) nesta parte do fruto. Os compostos bioativos determinados por DPPH apresentaram resultados que variaram de 41,10 a 98,32 µmolTrolox.g-1, e ABTS, que apresentaram resultados que variaram de 141, 54 µmolTrolox.g-1 a 402,14 µmolTrolox.g-1. Assim, o elevado teor de carotenoides constatado, é fonte de antioxidantes que estabilizam os radicais livres, importantes no combate ao estresse oxidativo.

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Produção de etanol de segunda geração a partir de caroço de abacate (Persea americana Mill.)

Cited by 5 publications

References 1 publication

Pilot-scale bioethanol production from the starch of avocado seeds using a combination of dilute acid-based hydrolysis and alcoholic fermentation by Saccharomyces cerevisiae

Pilot-scale bioethanol production from the starch of avocado seeds using a combination of dilute acid-based hydrolysis and alcoholic fermentation by Saccharomyces cerevisiae

Second-generation ethanol: concept, production and challenges

Avaliação de carotenoides e atividade antioxidante da polpa madura do abacate (persea americana mill)

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