The Improvement of Sugar and Bioethanol Production of Oil Palm Empty Fruit Bunches (Elaeis guineensis Jacq) through Microwave-Assisted Maleic Acid Pretreatment

Fatriasari, Widya; Raniya, Rika; Oktaviani, Maulida; Hermiati, Euis

doi:10.15376/biores.13.2.4378-4403

Cited by 25 publications

(13 citation statements)

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“…The high cellulose loss can result in a smaller source of carbohydrates that can be converted into sugars (Fatriasari et al, 2018). However, compared to Table 2, it shows that cellulose loss is significantly affected by higher temperature rather than by longer reaction time.…”

Section: Optimization Of Reaction Time During Steam Pretreatmentmentioning

confidence: 80%

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Pretreatment of Oil Palm Empty Fruit Bunch (OPEFB) at Bench-Scale High Temperature-Pressure Steam Reactor for Enhancement of Enzymatic Saccharification

Sari

Falah

Anita

et al. 2020

IJRED

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Up scaling of biomass pretreatment from laboratory scale to a bench-scale reactor is one of important steps in the application of the pretreatment for pilot or commercial scale. This study reports the optimization of pretreatment conditions, namely reaction temperature and time, by one factor at a time (OFAT) method for the enhancement of enzymatic saccharification of oil palm empty fruit bunch (OPEFB). OPEFB was pretreated using high temperature-pressure steam reactor with different reaction temperatures (160, 170, 180, 190, 200 °C) and times (10, 20, 30, 40, 50 min). The effectiveness of the pretreatment was determined based on chemical compositions of untreated and pretreated OPEFB and sugar production from enzymatic saccharification of the pretreated OPEFB. Solubilized components in the water that generates the steam were also determined. Pretreatment at 180°C for 20 min provides the highest sugar yields (97.30% of glucose yield per initial cellulose and 88.86% of xylose yield per initial hemicellulose). At the optimum condition 34.9% of lignin and 30.75% of hemicellulose were successfully removed from the OPEFB and resulted in 3.43 delignification selectivity. The relationship between severity factor and by-products generated and the sugars obtained after enzymatic saccharification were discussed. The pretreated OPEFB at the optimum condition was also characterized for its morphological characteristic by scanning electron microscopy (SEM) and crystallinity by X-ray diffractometry (XRD) and then compared it with untreated one. The steam pretreatment caused some fiber disruptions with more defined and opened structures and increased of the crystallinity index (CrI) by 2.9% compared to the untreated OPEFB

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Section: Optimization Of Reaction Time During Steam Pretreatmentmentioning

confidence: 80%

“…Besides the structural component of OPEFB, nonstructural component such as extractives was also dissolved and facilitated in improving the enzyme accessibility on carbohydrate (Fatriasari et al, 2018). The higher reaction temperature, the higher extractives content in OPEFB pulp (Table 2).…”

Section: Tablementioning

confidence: 99%

Pretreatment of Oil Palm Empty Fruit Bunch (OPEFB) at Bench-Scale High Temperature-Pressure Steam Reactor for Enhancement of Enzymatic Saccharification

Sari

Falah

Anita

et al. 2020

IJRED

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“…The experiments at those points were conducted in duplicates. The ranges of acid concentration (0.5-2%), temperature (170-200 °C), and heating time (2-8 min) for the optimization were selected based on our previous experiments on microwave-maleic acid pretreatemnt of some biomass, such as sugarcane bagasse, oil palm empty fruit bunch, and sugarcane trash (Sari et al, 2016, Solihat et al, 2017, Fatriasari et al, 2018, Anita et al, 2019. The quadratic second order polynomial model was fitted to the data by multiple regression análysis as follows.…”

Section: Materials and Methods Materialsmentioning

confidence: 99%

“…Microwave heating has been proved more efficient than conventional heating, because the heating process using microwave is direct, uniform, and faster (Tsubaki et al, 2013, Ohashi andWatanabe, 2018). The use of organic acids, such as maleic or oxalic acid, in the fractionation of lignocellulosic biomass has been reported by Kootstra et al, 2009;Jung et al, 2014Jung et al, , 2015Barisik et al, 2016;Kundu and Lee, 2015;Solihat et al, 2017;Fatriasari et al, 2018;Anita et al, 2019). However, they mostly focused on the effects of the pretreatment on the enzyme susceptibility of the solid residues resulted from pretreatment.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Xylose Production from Sugarcane Trash by Microwave-Maleic Acid Hydrolysis

Hermiati

Oktaviani

Ermawar

et al. 2020

Reaktor

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Sugarcane trash contains significant amount of xylan that could be hydrolysed to xylose. The xylose could be further fermented to produce xylitol, a sugar alcohol that has low calories and does not cause carries of teeth. In this study we optimized the production of xylose from sugarcane trash by microwave-assisted maleic acid hydrolysis using response surface methodology (RSM). The factors optimized were acid concentration, time, and temperature. The xylose yield based on the weight of initial biomass was determined and it served as a response variable. Results show that acid concentration and interaction between time and temperature had significant effect on xylose yield. The quadratic regression model generated from the optimization was fit and can be used to predict the xylose yield after hydrolysis with various combinations of acid concentration, time, and temperature. The optimum condition for xylose production from sugarcane trash was using maleic acid of 1.52%, and heating at 176 °C for 6.8 min. At this condition the yield of xylose was 24.3% per initial biomass or 0.243 g/ g biomass.Keywords: maleic acid; microwave heating; response surface methodology; sugarcane trash, xylose

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“…The conversion process involves three steps: pretreatment, hydrolysis, and fermentation. Dilute acid was most often used for OPEFB pretreatment . Other than that, dilute alkali was also quite often used because it was able to enhance biomass accessibility with high cellulose and hemicellulose yield .…”

Section: Introductionmentioning

confidence: 99%

Enzyme production and oil palm empty fruit bunch bioconversion to ethanol using a hybrid yeast strain

Zhai

Manglekar

Geng

2019

Biotech and App Biochem

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Oil palm empty fruit bunch (OPEFB) is a lignocellulosic biomass generated in palm oil mills. It is a sustainable resource for fuels and chemicals. In this study, OPEFB was converted to ethanol by an integrative OPEFB conversion process including dilute alkaline pretreatment, cellulolytic enzyme production, separate OPEFB hydrolysis, and cofermentation using a hybrid xylose-fermenting yeast. OPEFB was pretreated using 1% (w/v) NaOH solution followed by 1% (v/v) H 2 O 2. Further, cellulolytic enzymes were produced by submerged fermentation using Trichoderma reesei Rut C30 and used for OPEFB hydrolysis. The filter paper cellulase activity of the crude cellulolytic enzymes was 15.1 IU/mL, which was higher than those obtained by reported Trichoderma strains under laboratory conditions. Glucose and xylose yields reached 66.9% and 74.2%, respectively, at 30 filter paper unit (FPU)/g-biomass enzyme dosage and 10% (w/v) biomass loading. The hybrid yeast strain ScF2 was previously constructed through recursive genome shuffling of Pichia stipitis and Saccharomyces cerevisiae and was used in OPEFB hydrolysate fermentation. About 16.9 g/L ethanol was produced with an ethanol yield of 0.34 g/g sugars, which was 67% of theoretical ethanol yield.

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The Improvement of Sugar and Bioethanol Production of Oil Palm Empty Fruit Bunches (Elaeis guineensis Jacq) through Microwave-Assisted Maleic Acid Pretreatment

Cited by 25 publications

References 0 publications

Pretreatment of Oil Palm Empty Fruit Bunch (OPEFB) at Bench-Scale High Temperature-Pressure Steam Reactor for Enhancement of Enzymatic Saccharification

Pretreatment of Oil Palm Empty Fruit Bunch (OPEFB) at Bench-Scale High Temperature-Pressure Steam Reactor for Enhancement of Enzymatic Saccharification

Optimization of Xylose Production from Sugarcane Trash by Microwave-Maleic Acid Hydrolysis

Enzyme production and oil palm empty fruit bunch bioconversion to ethanol using a hybrid yeast strain

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