Effect of sodium hydroxide pretreatment on released sugar yields from pomelo peels for biofuel production

Chatkaew, Chaichana; Panakkal, Elizabeth Jayex; Rodiahwati, Wawat; Kirdponpattara, Suchata; Chuetor, Santi; Sriariyanun, Malinee; Cheenkachorn, Kraipat

doi:10.1051/e3sconf/202130202015

Cited by 8 publications

(4 citation statements)

References 20 publications

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“…The Figure showed that for the use of base concentrations 0.2 M and 0.4 M have a tendency to the same result, but different tendencies are shown in the use of 0.1 M. At the usage of a lower concentration of alkaline solvents of 0.1 M, the extended in reaction time from 10 minutes to 25 minutes leads to degradation in the reducing sugar obtained from 0.067% to 0.021% and again rose up on the increase in the 30-minute reaction time to 0.076%. This decrease may be due to the destruction of the internal structure of biomass caused by the long pretreatment time (Chatkaew et al, 2021) . The same trend is shown by the results of research conducted by Mandra Harahap et al (2020).…”

Section: Figure 1 the Effect Of Reaction Time And Concentration Of Ac...mentioning

confidence: 99%

Effect of Chemical and Microwave Heating Treatment for Reducing Sugar Recovery

Rahkadima

Fitri²

2022

JKR

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Microwave heating treatment was the one type of pretreatment process used in the manufacture bioethanol because it can be applied singly or in combination with other chemicals. The purpose of this study was to determine the effect of microwave heating on the pretreatment process using acid and alkaline solvents. The research was carried out in two stages, namely the preparation of raw materials and pretreatment with microwave. At the stage of preparation of raw materials, bagasse was dried for 2 days and then crushed to a size of 50 mesh to uniform the size of the raw materials. The raw materials that have been prepared are then subjected to a pretreatment process. The pretreatment process was carried out using a modified microwave with temperature settings and the addition of a stirrer. 5 grams of bagasse powder and 200 ml of a solution of H2SO4 or NaOH (0.2 M, 0.4 M, and 1 M) were put into a round tool flask and then put into the microwave. Pretreatment was carried out at 180°C with time variables of 10, 15, 20, 25, and 30 minutes. Then the solution was separated from the residual solid by filtration and the solution was neutralized with 1 M HCl. The results showed that the use of acidic and alkaline solvents, high concentrations of solvents can lead to smaller the acquisition of reducing sugars in the liquid product phase. The highest percentage of reducing sugar obtained is 0.559% when using an acid solvent with a concentration of 0.1 M for 20 minutes.

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Section: Figure 1 the Effect Of Reaction Time And Concentration Of Ac...mentioning

confidence: 99%

Effect of Chemical and Microwave Heating Treatment for Reducing Sugar Recovery

Rahkadima

Fitri²

2022

JKR

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“…Several studies have suggested that the combination of two or more pretreatment methods can yield greater delignification and higher sugar yields than a single pretreatment method [23][24][25][26]. In this work, the effect of combined alkaline pretreatment and Deep eutectic solvent (DES) pretreatment on enzymatic hydrolysis of yellow thatching grass (Hyparrhenia filipendula) is investigated.…”

Section: Introductionmentioning

confidence: 99%

Fractionation of Yellow Thatching Grass (Hyparrhenia filipendula) for Sugar Production Using Combined Alkaline and Deep Eutectic Solvent Pretreatment

Masuku

Ayaa

Onyelucheya

et al. 2023

Waste Biomass Valor

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Biomass pretreatment followed by enzymatic hydrolysis is one of the most viable ways to obtain sugars from biomass. In this work, the effect combined alkaline pretreatment and Deep Eutectic Solvent (DES) on enzyme hydrolysis of Hyparrhenia filipendula by cellulase is investigated. There is no previously reported literature on this substrate and the authors aim to establish baseline values for further research in the utilization of Hyparrhenia filipendula. MethodsThe yellow thatching grass (Hyparrhenia filipendula) was fractionated with a combination of alkaline and Deep Eutectic Solvent (DES) to increase sugar recovery. An alkaline solution of 10 wt % (w/v) of Sodium Hydroxide (NaOH) was used for the first stage of pretreatment at 100 °C for 4 h. Three DES, namely, Choline chloride (ChCl): urea; ChCl: glycerol; and Ethylene glycol: Citric acid at 1:2 molar ratio each, were heated to 80 °C until a clear solution was formed. The DESs were used for the second stage of pretreatment at 110 °C for 6 h in a Parr reactor. During the pretreatment, a solid: solvent ratio of 1:10 was used for the first and second stages of pre-treatment. Enzymatic hydrolysis was accomplished with a cellulase enzyme blend, Cellic CTec2, in a 50 mM sodium citrate buffer (pH 4.8) at 50 °C using a shaking incubator at a speed of 150 rpm. A solid loading of 2 % and enzyme dosage of 50 g/100 g cellulose in the sample was used for all the experiments. Furthermore, samples were withdrawn every 24 hours for 7 days and analyzed for glucose and xylose using High-Performance Liquid Chromatography (HPLC). ResultsA high delignification of 90 % and hemicellulose removal of 70 % was achieved with a combination of Alkali and ChCl: Urea pretreatment. Subsequently, the highest glucose and xylose conversion of 90 % and 92 % were observed, respectively, with the same sample. Additionally, the highest glucose yield achieved was 25 gL -1 from the combined alkaline/ChCl: Glycerol treated sample after 120 h. Moreover, the highest xylose yield was 3 gL -1 from the raw sample, the NaOH-pulped sample, and the ChCl: Glycerol-treated sample. ConclusionThe results from this study demonstrated that the solvents used for fractionating biomass have a significant effect on the sugar recovery during enzymatic hydrolysis. Also, the pretreatment with a combination of NaOH and DES of ChCl: Glycerol was the most effective for the recovery of glucose and total sugar. In conclusion, yellow thatching grass is a promising substrate for bio-refineries. However, the ideal conditions for enzyme hydrolysis should be investigated further to promote its utilization for value-added products.

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“…The complexity of biomass structure has resulted in the application of advanced technology such as a pretreatment process to break down its structure to a simpler form. This step will help in breaking down the polymers into monomers and oligomers that can be taken to the downstream processing steps and finally converted to bioethanol [8]. Among various types of pretreatment methods, including physical, chemical, physicochemical, and biological approaches, chemical pretreatment is extensively employed for biomass utilization.…”

Section: Introductionmentioning

confidence: 99%

“…[9,10]. Among the various types of chemical pretreatment, acid pretreatment, and alkaline pretreatment are commonly used techniques [8,11,12]. Acid pretreatment can be done with both organic and inorganic acids, however, the use of inorganic acid generates more inhibitors and can cause corrosion to the equipment than the organic acids [13] and it has the benefit of environmental protection [14].…”

Section: Introductionmentioning

confidence: 99%

Oxalic Acid Pretreatment on Enhancement of Enzymatic Saccharification from Napier Grass for Biofuel Production

Panyarachun,

Panakkal,

Tawai

et al. 2023

E3S Web Conf.

Self Cite

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Thailand as an agricultural country faces significant challenges in managing the abundant biomass waste generated from agricultural activities. Conventional disposal methods such as incineration contribute to pollution and limited availability of landfill space. To mitigate these issues valorization of this biomass waste has been a solution. This study focuses on the utilization of Napier grass as a renewable energy source. In this experiment, the Napier grass samples were pretreated using oxalic acid with temperature variations (50 – 100 °C), time (30 180 min), and oxalic acid concentration (2 10%w/v) to determine the limit of these three factors for optimization studies. The utilization of Box-Behnken Design (BBD) within Response Surface Methodology (RSM) enabled the determination of optimal pretreatment conditions and the exploration of the correlation between pretreatment factors and reducing sugar content. The model predicted pretreatment with an oxalic acid concentration of 6% w/v, pretreated at 100 °C for 105 min as the optimal pretreatment condition to produce a maximum reducing sugar concentration of 10.65 mg/ml. Therefore, the sample was pretreated at optimum conditions and the results revealed the amount of reducing sugar obtained was 10.67 mg/ml, which differed from the predicted value with an error of 0.22%. Thus, this study provides insight for future researchers on the optimum condition that can be applied for pretreating biomass with oxalic acid to maximize the sugar yield.

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Effect of sodium hydroxide pretreatment on released sugar yields from pomelo peels for biofuel production

Cited by 8 publications

References 20 publications

Effect of Chemical and Microwave Heating Treatment for Reducing Sugar Recovery

Effect of Chemical and Microwave Heating Treatment for Reducing Sugar Recovery

Fractionation of Yellow Thatching Grass (Hyparrhenia filipendula) for Sugar Production Using Combined Alkaline and Deep Eutectic Solvent Pretreatment

Oxalic Acid Pretreatment on Enhancement of Enzymatic Saccharification from Napier Grass for Biofuel Production

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