Enhanced enzymatic hydrolysis of rice straw via pretreatment with deep eutectic solvents-based microemulsions

Gao, Jing; Chen, Cuili; Lin, Yanping; Zhang, Lili; Ji, Hongwu; Liu, Shucheng

doi:10.1016/j.biteb.2020.100404

Cited by 9 publications

(5 citation statements)

References 24 publications

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“…Depending on the exact surfactants used, the replacement can also lead to a sphere to rod transition . DES based microemulsions were successfully tested for applications in biomass pretreatment for enzymatic hydrolysis and as potential transdermal carriers of resveratrol, a drug which is difficult to dissolve in both water and oil. , In that direction of transdermal delivery a formulation based on Tween-80 and Span-20 in was studied in thorough detail, including SAXS measurments that showed that position of the correlation peak is little changed when substituting water by a DES of ChCl and glycerol . However, here it should be noted that this was a study on a borderline case, containing five times more surfactant than water/DES.…”

Section: Nonclassical Microemulsionsmentioning

confidence: 99%

Using Microemulsions: Formulation Based on Knowledge of Their Mesostructure

et al. 2021

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Microemulsions, as thermodynamically stable mixtures of oil, water, and surfactant, are known and have been studied for more than 70 years. However, even today there are still quite a number of unclear aspects, and more recent research work has modified and extended our picture. This review gives a short overview of how the understanding of microemulsions has developed, the current view on their properties and structural features, and in particular, how they are related to applications. We also discuss more recent developments regarding nonclassical microemulsions such as surfactant-free (ultraflexible) microemulsions or ones containing uncommon solvents or amphiphiles (like antagonistic salts). These new findings challenge to some extent our previous understanding of microemulsions, which therefore has to be extended to look at the different types of microemulsions in a unified way. In particular, the flexibility of the amphiphilic film is the key property to classify different microemulsion types and their properties in this review. Such a classification of microemulsions requires a thorough determination of their structural properties, and therefore, the experimental methods to determine microemulsion structure and dynamics are reviewed briefly, with a particular emphasis on recent developments in the field of direct imaging by means of electron microscopy. Based on this classification of microemulsions, we then discuss their applications, where the application demands have to be met by the properties of the microemulsion, which in turn are controlled by the flexibility of their amphiphilic interface. Another frequently important aspect for applications is the control of the rheological properties. Normally, microemulsions are low viscous and therefore enhancing viscosity has to be achieved by either having high concentrations (often not wished for) or additives, which do not significantly interfere with the microemulsion. Accordingly, this review gives a comprehensive account of the properties of microemulsions, including most recent developments and bringing them together from a united viewpoint, with an emphasis on how this affects the way of formulating microemulsions for a given application with desired properties.

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Section: Nonclassical Microemulsionsmentioning

confidence: 99%

Using Microemulsions: Formulation Based on Knowledge of Their Mesostructure

et al. 2021

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“…Recently, a new class of catalysts called as the deep eutectic solvents (DESs) that consist of a eutectic-mix of Lewis or Brønsted acids and bases with atleast one hydrogen bond donor (HBD) and an acceptor (HBA) were found to be equally promising for delignification 22 , 23 . Moreover, DESs are effective, cheaper, biodegradable and recyclable solvents 24 ; albeit being slow-acting (12–24 h) 25 , 26 and may show some deterioration over time 27 , 28 . Overall, the choice of the pretreatment influences the nature of cellulose-rich solids and its amenability to hydrolysis by cellulases.…”

Section: Introductionmentioning

confidence: 99%

Generation of highly amenable cellulose-Iβ via selective delignification of rice straw using a reusable cyclic ether-assisted deep eutectic solvent system

Chiranjeevi

Balasubramaniam

Velankar

2021

Sci Rep

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Cellulolytic enzymes can readily access the cellulosic component of lignocellulosic biomass after the removal of lignin during biomass pretreatment. The enzymatic hydrolysis of cellulose is necessary for generating monomeric sugars, which are then fermented into ethanol. In our study, a combination of a deep eutectic (DE) mixture (of 2-aminoethanol and tetra-n-butyl ammonium bromide) and a cyclic ether (tetrahydrofuran) was used for selective delignification of rice straw (RS) under mild conditions (100 °C). Pretreatment with DE-THF solvent system caused ~ 46% delignification whereas cellulose (~ 91%) and hemicellulose (~ 67%) recoveries remained higher. The new solvent system could be reused upto 10 subsequent cycles with the same effectivity. Interestingly, the DE-THF pretreated cellulose showed remarkable enzymatic hydrolysability, despite an increase in its crystallinity to 72.3%. Contrary to conventional pretreatments, we report for the first time that the enzymatic hydrolysis of pretreated cellulose is enhanced by the removal of lignin during DE-THF pretreatment, notwithstanding an increase in its crystallinity. The current study paves way for the development of newer strategies for biomass depolymerization with DES based solvents.

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“…Several articles have described the delignification of different types of biomass using deep eutectic solvents (DES)/LTTM, and many applications of DES/LTTM have been published (Vigier et al 2015;Kumar et al 2016a). Delignifications of wheat straw (Jablonský et al 2015;Jablonský et al 2019a;Lou et al 2019;Suopajäri et al 2020) and rice straw (Kumar et al 2018;Gao et al 2020), of various types of wood (willow, poplar, beech, oak) (Alvarez-Vasco et al 2016;Xia et al 2018;Jablonský et al 2019a;Tian et al 2020), or delignification of corn cob (Xu et al 2018) have been described. In addition to these types of biomass, several research papers from various authors have been added in recent years, focusing on oil palm empty fruit bunch pretreatment, eucalyptus, and pulp delignification (Nor et al 2016;Škulcová et al 2017;Liang et al 2019;Jablonský et al 2019b).…”

Section: Introductionmentioning

confidence: 99%

Delignification of hemp stalk using a low transition temperature mixture composed of choline chloride and lactic acid

Jančíková

Jablonský

2022

BioRes

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This work used a literature search to select the most suitable system for the delignification process of annual plants. This process was evaluated in terms of lignin removal from plant biomass. Based on previous experiments, a low transition temperature mixture (LTTM) was used, which was a mixture of choline chloride and lactic acid in a molar ratio of 1:2. Samples of hemp fibers were examined. The delignification of biomass was monitored by changing the content of the main components. After application of the solvent at a temperature of 100, 120, or 140 °C and a delignification time of 2 or 4 h, the lignin content expressed by Kappa number decreased to the level of 22 to 13.7. Yields of hemp fibers sown after LTTM application ranged from 72.5 to 90.6%. The results confirmed that the use of LTTM (choline chloride/lactic acid) is a suitable system for the extraction of lignin from biomass. The findings showed that LTTM was an effective delignifying agent for hemp, as a relatively low Kappa number of 13.7 and a yield of 75.9% were achieved after only 2 h and at 140 °C.

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Enhanced enzymatic hydrolysis of rice straw via pretreatment with deep eutectic solvents-based microemulsions

Cited by 9 publications

References 24 publications

Using Microemulsions: Formulation Based on Knowledge of Their Mesostructure

Using Microemulsions: Formulation Based on Knowledge of Their Mesostructure

Generation of highly amenable cellulose-Iβ via selective delignification of rice straw using a reusable cyclic ether-assisted deep eutectic solvent system

Delignification of hemp stalk using a low transition temperature mixture composed of choline chloride and lactic acid

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