scholarly journals Optimization of thermal acid hydrolysis for bioethanol production from Ulva rigida with yeast Pachysolen tannophilus

2018 ◽  
Vol 115 ◽  
pp. 161-169 ◽  
Author(s):  
M. El Harchi ◽  
F.Z. Fakihi Kachkach ◽  
N. El Mtili
Keyword(s):  
Acid Hydrolysis ◽  
Bioethanol Production ◽  
Ulva Rigida ◽  
Pachysolen Tannophilus ◽  
Thermal Acid Hydrolysis

scholarly journals Optimized acid hydrolysis of the polysaccharides from the seaweed Solieria filiformis (Kützing) P.W. Gabrielson for bioethanol production

2017 ◽  
Vol 39 (4) ◽  
pp. 423 ◽  
Author(s):  
George Meredite Cunha de Castro ◽  
Norma Maria Barros Benevides ◽  
Maulori Curié Cabral ◽  
Rafael De Souza Miranda ◽  
Enéas Gomes Filho ◽  
...  
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Sulfuric Acid ◽  
Acid Hydrolysis ◽  
Kinetic Parameters ◽  
Renewable Resource ◽  
Bioethanol Production ◽  
Seaweed Species ◽  
Mild Conditions ◽  
Hydrolysis Of ◽  
Solieria Filiformis

 The seaweeds are bio-resource rich in sulfated and neutral polysaccharides. The tropical seaweed species used in this study (Solieria filiformis), after dried, shows 65.8% (w/w) carbohydrate, 9.6% (w/w) protein, 1.7% (w/w) lipid, 7.0% (w/w) moisture and 15.9% (w/w) ash. The dried seaweed was easily hydrolyzed under mild conditions (0.5 M sulfuric acid, 20 min.), generating fermentable monosaccharides with a maximum hydrolysis efficiency of 63.21%. Galactose and glucose present in the hydrolyzed were simultaneously fermented by Saccharomyces cerevisiae when the yeast was acclimated to galactose and cultivated in broth containing only galactose. The kinetic parameters of the fermentation of the seaweed hydrolyzed were Y(P⁄S) = 0.48 ± 0.02 g.g−1, PP = 0.27 ± 0.04 g.L−1.h−1, h = 94.1%, representing a 41% increase in bioethanol productivity. Therefore, S. filiformis was a promising renewable resource of polysaccharides easily hydrolyzed, generating a broth rich in fermentable monosaccharides for ethanol production. 

scholarly journals Acid and Enzymatic Hydrolyses of Rice Bran for Bioethanol Production

ALCHEMY ◽  
2018 ◽  
Vol 6 (1) ◽  
pp. 24
Author(s):  
Dewi Yuliani ◽  
Khoirul Achmad Julianto ◽  
Akyunul Jannah
Keyword(s):  
Enzymatic Hydrolysis ◽  
Hydrochloric Acid ◽  
Acid Hydrolysis ◽  
Sulphuric Acid ◽  
Rice Bran ◽  
Dilute Hydrochloric Acid ◽  
Cellulolytic Enzyme ◽  
Bioethanol Production ◽  
By Products ◽  
Sugar Source

<p class="BodyAbstract">Rice bran is one among many agricultural by-products containing ~50-60 wt.% of carbohydrate. The carbohydrate is a prominent sugar source for bioethanol production. The objective of this research was to study bioethanol production from rice bran by acid and enzymatic treatment. The variations of acid used were dilute hydrochloric acid and sulphuric acid, while variations of enzyme used were amylolytic and cellulolytic enzyme. Ethanol production of acid-hydrolyzed rice bran was 24.95±1.61% (v/v) by hydrochloric acid and 29.57±2.04% (v/v) by sulphuric acid. Ethanol produced by enzymatic hydrolysis was quite low i.e. 6.7±0.04%, and 8.86±0.29% (v/v) for amylolytic and cellulolytic hydrolysate, respectively.</p><p class="BodyAbstract"> </p><p>Keywords: Bioethanol, rice bran, acid hydrolysis, enzymatic hydrolysis</p>

scholarly journals Fermentation Study on Macroalgae Eucheuma cottonii for Bioethanol Production via Varying Acid Hydrolysis

2012 ◽  
pp. 219-240 ◽  
Author(s):  
Rachel Fran Mansa ◽  
Wei-Fang Chen ◽  
Siau-Jen Yeo ◽  
Yan-Yan Farm ◽  
Hafeza Abu Bakar ◽  
...  
Keyword(s):  
Acid Hydrolysis ◽  
Bioethanol Production ◽  
Eucheuma Cottonii

scholarly journals The Effects of Microwave-Assisted Pretreatment and Cofermentation on Bioethanol Production from Elephant Grass

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Sefrinus Maria Dolfi Kolo ◽  
Deana Wahyuningrum ◽  
Rukman Hertadi
Keyword(s):  
Acid Hydrolysis ◽  
Hydrolysis Product ◽  
Pichia Stipitis ◽  
Pennisetum Purpureum ◽  
Bioethanol Production ◽  
Elephant Grass ◽  
Microwave Assisted ◽  
Liquid Chromatographic Analysis ◽  
High Concentrations ◽  
Liquid Chromatographic

The process of acid hydrolysis using conventional methods at high concentrations results in products having lower yields, and it needs a longer time of process; therefore, it becomes less effective. In this study, we analyzed the effects of microwave-assisted pretreatment and cofermentation on bioethanol production from elephant grass (Pennisetum purpureum). We used a combination of delignification techniques and acid hydrolysis by employing a microwave-assisted pretreatment method on elephant grass (Pennisetum purpureum) as a lignocellulosic material. This was followed by cofermentation with Saccharomyces cerevisiae ITB-R89 and Pichia stipitis ITB-R58 to produce bioethanol. The optimal sugar mixtures (fructose and xylose) of the hydrolysis product were subsequently converted into bioethanol by cofermentation with S. cerevisiae ITB-R89 and P. stipitis ITB-R58, carried out with varying concentrations of inoculum for 5 days (48 h) at 30°C and pH 4.5. The high-power liquid chromatographic analysis revealed that the optimal inoculum concentration capable of converting 76.15% of the sugar mixture substrate (glucose and xylose) to 10.79 g/L (34.74% yield) of bioethanol was 10% (v/v). The optimal rate of ethanol production was 0.45 g/L/d, corresponding to a fermentation efficiency of 69.48%.

Selecting optimum thermal acid hydrolysis conditions for obtaining lactobacillus hydrolysates

2007 ◽  
Vol 41 (2) ◽  
pp. 115-118
Author(s):  
M. V. Gavrilin ◽  
G. V. Sen'chukova ◽  
S. P. Senchenko ◽  
V. A. Samoilov ◽  
N. M. Gostishcheva
Keyword(s):  
Acid Hydrolysis ◽  
Hydrolysis Conditions ◽  
Thermal Acid Hydrolysis
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