Surface functionalization of nanofibrillated cellulose extracted from wheat straw: Effect of process parameters

Singh, Mandeep; Kaushik, Anupama; Ahuja, Dheeraj

doi:10.1016/j.carbpol.2016.04.109

Cited by 71 publications

(35 citation statements)

References 39 publications

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“…The relatively high content of silica was commonly found in RS, and the value of 9.15% was consistent with other reports [27,28]. After pretreatment, the EDX spectra showed higher percentage of carbon than oxygen, which may reflect the cellulosic component [29]. The silica content decreased about 3-fold, indicating that the pretreatment affected the silica layers.…”

Section: Edx Analysissupporting

confidence: 89%

Structural Analysis of Alkaline Pretreated Rice Straw for Ethanol Production

Phitsuwan

Permsriburasuk

Baramee

et al. 2017

International Journal of Polymer Science

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Rice straw (RS) is an abundant, readily available agricultural waste, which shows promise as a potential feedstock for Asian ethanol production. To enhance release of glucose by enzymatic hydrolysis, RS was pretreated with aqueous ammonia (27% w/w) at two pretreatment temperatures: room temperature and 60 ∘ C. Statistical analysis indicated similarity of enzymatic glucose production at both pretreatment temperatures after 3-day incubation. Chemical composition, FTIR, and EDX analyses confirmed the retention of glucan and xylan in the pretreated solid, but significant reduction of lignin (60.7% removal) and silica. SEM analysis showed the disorganized surfaces and porosity of the pretreated RS fibers, thus improving cellulose accessibility for cellulase. The crystallinity index increased from 40.5 to 52.3%, indicating the higher exposure of cellulose. With 10% (w/v) solid loadings of pretreated RS, simultaneous saccharification and fermentation yielded a final ethanol concentration of 24.6 g/L, corresponding to 98% of maximum theoretical yield. Taken together, aqueous ammonia pretreatment is an effective method to generate highly digestible pretreated RS for bioethanol production and demonstrates potential application in biorefinery industry.

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Section: Edx Analysissupporting

confidence: 89%

Structural Analysis of Alkaline Pretreated Rice Straw for Ethanol Production

Phitsuwan

Permsriburasuk

Baramee

et al. 2017

International Journal of Polymer Science

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“…Recently, there has been increasing interest in the utilization of surface-active polysaccharides as emulsifiers including pectin, gum arabic, modified starches, modified cellulose and galactomannans due to their excellent particle hydrophobicity, high adsorption capacity, biodegradability and biocompatibility (Sarika, Pavithran, & James, 2015;Tu et al, 2017;Yusoff & Murray, 2011;Zhang et al, 2015). Among them, cellulose has widely been applied in cosmetics or pharmaceuticals as stable matrix for sufficient interfacial activity (Dickinson, 2012;Do, Mitchell, Wolf, & Vieira, 2010;Singh, Kaushik, & Ahuja, 2016;Wang et al, 2016). However, many of them are confined to specific food products due to their modification which further complicates issues on altering their bio-based character, biodegradability and high cost (Do et al, 2010;Winuprasith & Suphantharika, 2013).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Emulsions stabilized by nanofibers from bacterial cellulose: New potential food-grade Pickering emulsions

Zhai

Lin

Liu

et al. 2018

Food Research International

165

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In the present work, we investigated the formation and stability of Pickering emulsions stabilized by nanoparticles generated from bacterial cellulose (BC) by hydrochloric acid hydrolysis. The resulting particles, called nanofibers, presented a ribbonlike shape with diameters of 30-80nm and range in length from 100nm to several micrometers. The obtained nanofibers showed good hydrophilic and lipophilic properties and had significant ability to reduce the surface tension of oil/water droplets from 48.55±0.03 to 34.52±0.05mN/m. The oil-in-water Pickering emulsions with a peanut oil concentration of 15% (v/v) were stabilized by only 0.05% (w/v) nanofibers and displayed a narrow droplet size distribution and high intensity with an average droplet size of 15.00±0.82nm. The morphological studies confirmed the nano-scaled droplets of emulsions. The effects of pH values and temperatures on the creaming ability and physical stability were also evaluated by zeta-potential and droplet sizes. Results showed that emulsions displayed relatively lower creaming ability at pH<7, while displayed optimal physical stability and dispersibility at pH≥7. The temperature (20-100°C) and time-dependent test (0-4weeks) indicated that the Pickering emulsions stabilized by only 0.05% (w/v) nanofibers displayed excellent stability. Due to the sustainability and good bio-compatibility of nanofibers from BC, the developed emulsions stabilized by low concentration of nanofibers can be used as new food-grade Pickering emulsions and have great potential to deliver lipophilic bioactive substances in food industry.

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“…Nanocellulose has high reinforcing capabilities because of their unique characteristics including high tensile strength, high Young's modulus, high flexibility, and low coefficient of thermal expansion [1][2][3][4]. Previous studies have confirmed that agrowastes such as cotton stalks [5], soybean hulls [6], rice straw [7], banana peel [8], and wheat straw [9] are important sources for the isolation of nanocellulose. As an agrowaste from edible oil industry, large quantities of rape straw are annually produced, particularly in China.…”

Section: Introductionmentioning

confidence: 99%

Dilute Alkali and Hydrogen Peroxide Treatment of Microwave Liquefied Rape Straw Residue for the Extraction of Cellulose Nanocrystals

Huang

Hoop

et al. 2017

Journal of Nanomaterials

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Microwave-assisted liquefaction of rape straw in methanol was conducted to collect the liquefied residues for the extraction of cellulose nanocrystals (CNCs). The liquefied residue with content of 23.44% from 180°C/7.5 min was used to fibrillate CNCs with dilute alkali (2% NaOH) and hydrogen peroxide (5% H2O2) treatments, followed by ultrasonication for 15 min. The FT-IR spectra and SEM images revealed that the liquefied residue from 180°C/7.5 min exhibited a relatively homogeneous texture and a huge surface with cellulose as core structure. The retained hemicelluloses and other impurities in the liquefied residue were eliminated by 2% NaOH treatment, and the surface and accessibility of the alkali treated sample were significantly increased by 5% H2O2 treatment. The TEM images confirmed the CNCs had an average diameter of 12.59 nm. The CNCs had good thermal stability with a maximum weight loss temperature of 376.5°C.

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Surface functionalization of nanofibrillated cellulose extracted from wheat straw: Effect of process parameters

Cited by 71 publications

References 39 publications

Structural Analysis of Alkaline Pretreated Rice Straw for Ethanol Production

Structural Analysis of Alkaline Pretreated Rice Straw for Ethanol Production

Emulsions stabilized by nanofibers from bacterial cellulose: New potential food-grade Pickering emulsions

Dilute Alkali and Hydrogen Peroxide Treatment of Microwave Liquefied Rape Straw Residue for the Extraction of Cellulose Nanocrystals

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