Comparison of deep eutectic solvents (DES) on pretreatment of oil palm empty fruit bunch (OPEFB): Cellulose digestibility, structural and morphology changes

Thi, Shiki; Lee, Kiat Moon

doi:10.1016/j.biortech.2019.03.065

Cited by 86 publications

(41 citation statements)

References 20 publications

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“…They show many favorable properties including negligible vapor pressure, nonflammability, low toxicity, biocompatibility and the possibility of being made from renewable materials; at the same time, their physico-chemical properties can be tuned by modifying the HBA/HBD structures or by changing the molar ratio of these components 18 . Besides, DESs are proved to be good pretreatment solvents 19,20 which could possess the outstanding ability due of its ability in cellulose, hemicellulose and lignin disruption 21 . Natural deep eutectic solvents NADESs , which are directly composed of natural products, such as organic acids, amino acids, sugars, choline or urea, have received increasing attentions because they are composed of primary metabolites in living cells.…”

mentioning

confidence: 99%

Microwave-assisted Natural Deep Eutectic Solvents Pretreatment Followed by Hydrodistillation Coupled with GC-MS for Analysis of Essential Oil from Turmeric (<i>Curcuma longa</i> L.)

Zhang

Jin

et al. 2021

J. Oleo Sci.

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IntroductionEssential oils EO or volatile oils, also known as essences, originate from the secondary metabolism of plants and have complex chemical components 1 . Turmeric Curcuma longa L. belongs to the family Zingiberaceae, is a perennial rhizomatous shrub native to Southern Asia. At present, the cultivation of this species is also widely distributed in some African countries 2 . The turmeric essential oil is widely used in traditional and modern system of medicine due to the presence of several medicinal properties like antibacterial, antifungal, antiviral, antiworm, antiallergic, anti-parasitic, antinociceptive, anti-platelet, antimutagenic and antiarthritic properties etc 3 6 .

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mentioning

confidence: 99%

Microwave-assisted Natural Deep Eutectic Solvents Pretreatment Followed by Hydrodistillation Coupled with GC-MS for Analysis of Essential Oil from Turmeric (<i>Curcuma longa</i> L.)

Zhang

Jin

et al. 2021

J. Oleo Sci.

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“… 22 The variation of the band at 1378 cm –1 might also be caused by the water pretreatment, which exposed more of the cellulose part. 23 …”

Section: Results and Discussionmentioning

confidence: 99%

Torrefaction at 200 °C of Pubescens Pretreated with AlCl₃ Aqueous Solution at Room Temperature

et al. 2020

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Metal salt soaking–torrefaction conversion technology was investigated. It was found that AlCl 3 pretreatment of pubescens favored observably the yield of liquid and small-molecular products in torrefaction via changing the composition and structure of the raw material. The maximum conversion of pretreated samples, washed (PSW) and Y liquid were 15.5 and 10.8 wt % (with 0.26 wt % monosaccharides, 0.26 wt % carboxylic acids, 0.38 wt % furan compounds, and 1.28 wt % phenols), where 20.4 wt % hemicellulose, 22.9 wt % cellulose, and 5.7 wt % lignin were converted, respectively. However, for pretreated samples (PS), the maximum conversion and Y liquid reached 44.2 and 32.1 wt %, respectively, along with 96.0 wt % hemicellulose and 31.8 wt % cellulose converted, yielding 2.39 wt % monosaccharides, 5.14 wt % carboxylic acids, 2.60 wt % furan compounds and 10.52 wt % phenols, indicating obvious catalytic effects of residual AlCl 3 on the decomposition of the three major components in torrefaction. Two-dimensional HSQC and electrospray ionization mass spectrometry (ESI-MS) characterizations further confirmed the dominant formation of oligomers derived from holocellulose, lignin, and cross-linkage involving the lignin–carbohydrate complex, indicating that the catalytic thermal cleavage of β-O-4, C-O-C, β-β, 5–5, 4-O-5, C α –C β , and α-O-4 linkages by aluminum species in the samples benefited the yield of liquid as well as monophenols.

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“…Therefore, as the molar ratio increased, the fructose yield and FCR in most DES systems gradually decreased. However, the higher the molar ratio of ChCl-LA in pretreatment of biomass, the lower the yield of reducing sugars obtained from the pretreated biomass [35]. This indicated that the e ciency of cellulose hydrolysis can improve by using a higher molar ratio of ChCl-LA.…”

Section: The Effect Of Ultrasound-assisted Des On Fructose Conversion 321 the Effect Of Des Molar Ratio On Fructose Conversionmentioning

confidence: 99%

Efficient and Environmental-Friendly Dehydration of Fructose to 5-HMF in Ultrasound Assisted Ionic Liquids / Deep Eutectic Solvents

Yagoub

et al. 2021

Preprint

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5-Hydroxymethylfurfural (5-HMF) is one of the most significant intermediate platforms for the production of both chemicals and liquid fuel derived from biomass. This study aimed to the assess the efficiency of ultrasound-assisted ionic liquids (ILs)/deep eutectic solvents (DES) in converting fructose to 5-HMF under milder conditions (≤ 100°C). The reaction conditions for the two-step transformation of sugarcane bagasse (SCB) with metal chloride as a catalyst and ultrasonic-assisted DES were optimized. The results showed that under the best conditions for ultrasound-assisted ILs to convert fructose (ultrasonic frequency: 40 kHz, 80°C, 1 h, [Bmim]Cl, D001-cc: 100 mg, fructose addition: 100 mg), the yield of 5-HMF reached 65.29 mol%. In addition, the D001-cc catalyst maintained high catalytic activity after being reused 6 times, and the activated D001-cc basically achieved the initial fructose conversion effect. Under the optimal conditions of ultrasonic-assisted DES fructose conversion (ultrasonic frequency: 40 kHz, 100°C, 30 min, ChCl-OA (molar ratio: 1:2), water addition: 0.46 mL, DES addition: 1 g), the yield of 5-HMF reached 51.87 mol%. Under the best conditions of ultrasonic-assisted DES SCB conversion (ultrasonic frequency: 40 kHz, ultrasonic time: 1 h, DES: ChCl: OA, catalyst: SnCl4·5H2O, water addition: 0.46 mL, 130°C/4 h (150°C/0.5 h)), the yield of 5-HMF reached 47.43 mol%. The study initially showed that ultrasonic-assisted ILs/DES effectively converted fructose in one step. In addition, the synergy of DES and metal chloride can better convert lignocellulosic biomass. Simply stated, the ultrasound-assisted ILs/DES conversion of biomass has realized “physical driving chemistry”. Thus, paving the way of high-value utilization of lignocellulose to become greener and economical.

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Comparison of deep eutectic solvents (DES) on pretreatment of oil palm empty fruit bunch (OPEFB): Cellulose digestibility, structural and morphology changes

Cited by 86 publications

References 20 publications

Microwave-assisted Natural Deep Eutectic Solvents Pretreatment Followed by Hydrodistillation Coupled with GC-MS for Analysis of Essential Oil from Turmeric (<i>Curcuma longa</i> L.)

Microwave-assisted Natural Deep Eutectic Solvents Pretreatment Followed by Hydrodistillation Coupled with GC-MS for Analysis of Essential Oil from Turmeric (<i>Curcuma longa</i> L.)

Torrefaction at 200 °C of Pubescens Pretreated with AlCl₃ Aqueous Solution at Room Temperature

Efficient and Environmental-Friendly Dehydration of Fructose to 5-HMF in Ultrasound Assisted Ionic Liquids / Deep Eutectic Solvents

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Comparison of deep eutectic solvents (DES) on pretreatment of oil palm empty fruit bunch (OPEFB): Cellulose digestibility, structural and morphology changes

Cited by 86 publications

References 20 publications

Microwave-assisted Natural Deep Eutectic Solvents Pretreatment Followed by Hydrodistillation Coupled with GC-MS for Analysis of Essential Oil from Turmeric (<i>Curcuma longa</i> L.)

Microwave-assisted Natural Deep Eutectic Solvents Pretreatment Followed by Hydrodistillation Coupled with GC-MS for Analysis of Essential Oil from Turmeric (<i>Curcuma longa</i> L.)

Torrefaction at 200 °C of Pubescens Pretreated with AlCl3 Aqueous Solution at Room Temperature

Efficient and Environmental-Friendly Dehydration of Fructose to 5-HMF in Ultrasound Assisted Ionic Liquids / Deep Eutectic Solvents

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Torrefaction at 200 °C of Pubescens Pretreated with AlCl₃ Aqueous Solution at Room Temperature