APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
·
2023
·Vol. 107
·期 5
·1551-1562
·
IF 5
Ye Jianbin,Li Jianqing,Wang Qiuhui,Wang Xiangjiang,Wang Shouan,Wang Honglin,Xu Jia
Abstract
In this study, loquat extract was selected as a promising substrate for bacterial cellulose (BC) production. A new BC-producing bacterial strain was isolated from residual loquat and identified as Komagataeibacter rhaeticus . BC production with different carbon sources and with loquat extract was investigated. Among all tested carbon sources, glucose was demonstrated to be the best substrate for BC production by K. rhaeticus , with up to 7.89 g/L dry BC obtained under the optimal initial pH (5.5) and temperature (28 °C) with 10 days of fermentation. The total sugar and individual sugars were investigated in different loquat extracts, in which fructose, glucose, and sucrose were the three main sugars. When loquat extract was prepared with a solid‒liquid (S-L) ratio of 2:1, the concentrations of glucose, fructose, and sucrose were 7.91 g/L, 9.31 g/L, and 2.84 g/L, respectively. The BC production obtained from loquat extract was higher than that of other carbon sources except glucose, and 6.69 g/L dry BC was obtained from loquat extract with an S-L ratio of 2:1. After BC production, all sugars substantially decreased, with the utilization of glucose, fructose, and sucrose reaching 93.9%, 87.9%, and 100%, respectively. These results suggested that the different sugars in loquat extract were all carbon sources participating in BC production by K. rhaeticus . Structural and physicochemical properties were investigated by SEM, TGA, XRD, and FT-IR spectroscopy. The results showed that the structural, chemical group, and water holding capacity of BC obtained from loquat extract were similar to those of BC obtained from glucose, but the crystallinity and thermal stability of BC were higher than those of BC from mannose and lactose but lower than those of BC from glucose and fructose. Key points A new BC-producing strain was isolated and identified as Komagataeibacter rhaeticus.
Loquat extract is an alternative substrate for BC production.
The BC obtained from loquat extract owns advanced physicochemical properties . Graphical Abstract
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 24
·4371
·
IF 5.719
Pengbo Xie,Ying Ge,Yida Wang,Jing Zhou,Yuanyuan Miao,Zhenbo Liu
Traditional conductive materials do not meet the increasing requirements of electronic products because of such materials’ high rigidity, poor flexibility, and slow biodegradation after disposal. Preparing flexible conductive materials with excellent mechanical properties is an active area of research. The key to flexible conductive materials lies in the combination of the polymer matrix and conductive components. This combination can be achieved by making a film of renewable nano-microcrystalline cellulose (NCC) and reduced graphene oxide (rGO) with excellent electrical conductivity—by simple filtration and introducing polyethylene glycol (PEG) to enhance the functionality of the composite film. Graphene imparted conductivity to the composite film, which reached 5.67 S·m−1. A reinforced NCC/rGO/PEG-4 composite film with a thickness of only 21 μm exhibited a tensile strength of 30.56 MPa, which was 83% higher than that of the sample without PEG (16.71 MPa), and toughness of 727.18 kJ·m−3, which was about 132% higher than that of the control sample (NCC/rGO, 313.86 kJ·m−3). This ultra-thin conductive composite film—which can be prepared simply, consists of environmentally sustainable and biodegradable raw materials, and exhibits excellent mechanical properties—has substantial potential for applications in e.g., flexible electronic wearable devices, electrodes, and capacitors.Keywords:nanocellulose;graphene;polyethylene glycol;composite film;flexible conductive material
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Jiming Yang,Shulin Wang,Fudong Bai,Xingmei Lu,Wei He,Zheng Fang,Ning Zhu,Kai Guo
Greatly reducing the cellulose crystallinity and lignin content of lignocellulose can substantially improve the enzymatic hydrolysis efficiency, dramatically reducing the enzyme dosage; however, it is difficult to be simultaneously achieved. A solution was put forward - biomass pretreatment was carried out with the binary system consisted of 1- n -butyl-3-methylimidazole chloride (BMIMCl) and arginine (Arg) at temperatures higher than the glass transition temperature of lignin (T g-lignin ). The cellulose crystallinity decreased because of hydrogen bonding with BMIMCl. Delignification was promoted via raising the temperature higher than the T g-lignin , while cellulose degradation was constrained by Arg. The delignification rate reached 90.36 %. The yield of cellulose remained at a level of 88.89 %, while the Crystallinity Index (CI) of cellulose decreased from 36.13 % (raw corn straw) to 13.50 % (regenerated material, RM). It was found that the average molecular weight (Mw) of lignin decreased from 1632 g/mol to 584 g/mol after pretreatment, indicating the lignin was depolymerized; the 2D-HSQC result showed the β-O-4′ bond of lignin was broken. Because the cellulose crystallinity and the lignin content of the regenerated material were reduced greatly at the same time, the RM was easily hydrolyzed by cellulase. The enzymatic hydrolysis glucose yield of the RM was 3.75 times that of raw corn straw when the enzyme dosage was only 0.41 FPU/g sample, reaching 99.5 %. The IL was successfully recycled four times, and the recovery rate was higher than 93 % each time. RM obtained in four cycles maintained high lignin removal rate and enzymatic hydrolysis glucose yield. The degradation products of hemicellulose and lignin were the main impurities in the recovered IL. This work may provide a new solution for green and efficient biomass pretreatment.
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Xiran Qiao,Kuanjun Fang,Xiuming Liu,Jixian Gong,Shuai Zhang,Jinkun Wang,Min Zhang,Fuyun Sun
When dyes were used for inkjet printing on multi-component fabrics, the complex acid-base conditions, high temperature and high humidity posed a challenge to the stability of water-soluble polymers covered the surface of the fabrics. In this study, hydroxypropyl methyl cellulose (HPMC) was used to construct a continuous film on the surface of cotton/polyamide interwoven fabric. The results show that the formation of ridges between fibers is closely related to the properties of HPMC. Fibers in the yarn were connected to each other by HPMC, which prevented inks from penetrating into the bottom of the yarns. Meanwhile, HPMC maintained high viscosity under acidic conditions, which provided conditions for reactive dyes to dye polyamide fibers under acidic conditions. Compare with sodium alginate , the color depth of cyan, magenta, yellow and black improved by 75.1 %, 101.8 %, 181.3 %, 207.5 % on cotton/polyamide fabrics using HPMC, separately. Hydroxypropyl methyl cellulose is effective to improve inkjet printing for cotton and polyamide fiber, which has the possibility of widespread application in natural fiber and synthetic fiber.
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2022
·
IF 3.662
Xin Xu,Desheng Liu,Zhongying Ji,Yixian Wang,Pan Jiang,Jiayu Wu,Fang Dong,Haiyuan Hu,Zhicheng Tang,Xiaolong Wang
Inspired by the Saccharum officinarum cellulose frameworks, a naturally hierarchical structured based continuous flow catalytic reactor (ZIF-67 @SCF CFR) was constructured, which was employed to reduce 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) in an effective and persistent way. The hierarchical structured based Saccharum officinarum cellulose frameworks have numerous aligned and open microchannels, abundant porosity, which afford nanometer grade perforation panel and the regular fibrovascular bundles and high-throughput transport and the abundance of highly active sites for growing ZIF-67 nanoparticles . The resulting built hierarchical Saccharum officinarum cellulose frameworks continuous flow reactor is as demonstrated by evaluating their activity in a model of catalytic reaction. The resultant ZIF-67 @SCF CFR (5 cm length, 15 mm diameter) exhibits superior 4-NP catalytic efficiency up to 100% after 40 min, and the long-term stability of ZIF-67 @SCF CFR was verified by continuously using 360 min, maintaining degradation efficiency of 40% after 240 min. Herein, the built ZIF-67 @SCF CFR has a certain persistence performance in degrading pollutants as a continuous flow catalytic reactor. And the ZIF-67 @SCF CFR has recyclability after freeze-drying and self-assembly processing. Moreover, the results show that the catalytic efficiency of ZIF-67 @SCF CFR increases with the growth of diameter and length of reactor. In short, naturally hierarchical structured based biomass material continuous flow reactor like ZIF-67 @SCF CFR with the features of natural, renewable, and degradable, has a special consistent of complicated multi-level porous structures, nano-level perforation plates, and regular agreement fibrovascular bundles, which could be employed as a promising candidate to reduce the water pollutants.
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2022
·Vol. 14
·期 20
·4413
·
IF 4.967
Xi Chen,Lijiaqi Zhang,Min Wu,Yong Huang
Green and sustainable cellulose-based hydrophobic coatings are increasingly the subject of scientific and industrial research. However, few researchers pay attention to preparing it by a one-step method. Therefore, a superhydrophobic coating composed of hydrophobic SiO2and cellulose nanofiber modified by 3,4-dichlorophenyl isocyanate was manufactured through one-step ball milling. It was found that the ball milling can promote SiO2dispersion and achieve the preparation of modified nanocellulose, which further disperse SiO2nanoparticles to form film or coating. Compared with the ultrasonic dispersion method, the composite coating prepared by ball milling method can obtain higher water contact angle and more stable hydrophobic properties. The hydrophobic cellulose nanofiber can load 1.5 equivalents of SiO2nanoparticles to form a uniform film with the water contact angle of 158.0° and low moisture absorption. When this nanocomposite is used as a coating material, it can impart super-hydrophobicity to paper surface with water contact angle of 155.8°. This work provides a facile way to prepare superhydrophobic nanocellulose/nanoparticles composite coatings and films, thereby broadening the ways of dispersing nanoparticles and constructing superhydrophobic coatings.Keywords:cellulose nanofiber;hydrophobic SiO2nanoparticle;composite;hydrophobic coating;optical tunable film
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF FOOD ENGINEERING
·
2022
·
IF 6.203
Zhongyu Yang,David Julian McClements,Xinwen Peng,Zhenlin Xu,Man Meng,Long Chen,Zhengyu Jin
Composite nanoparticles composed of zein and carboxymethyl cellulose (CMC) designed for the co-delivery of resveratrol and quercetin were prepared using antisolvent precipitation. At a mass ratio of zein-to-CMC of 2:1, composite nanoparticles with small average diameters (217 nm) could be formed. These nanoparticles had good thermal stability and did not aggregate or sediment when stored at pH 3.0–6.0. Encapsulation of quercetin and resveratrol simultaneously within the composite nanoparticles significantly improved their antioxidant activities . This study suggests that composite nanoparticles may have good physical and chemical stability, which may increase their application as co-delivery systems for bioactive components. As a result, they may be useful for personalized nutritional applications where combinations of bioactive compounds need to be orally administered.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Building Engineering
·
2022
·
IF 7.144
Ren Luo,Huai Liu,Ping Duan,Jiayuan Ye,Wei Chen,Zuhua Zhang,Aiguo Wang
As an alternative to the ordinary Portland cement (OPC), it is imperative to improve the performance of geopolymer under harsh conditions (such as sulfate/seawater attack). Sulfate attack is one of the reasons which cause deterioration and damages of geopolymer structures. Thus, the strategy of sulfate resistance attracts attention of researchers. As a reinforcement for geopolymer, the cellulose nanofiber (from waste bamboo powder) facilitates the utilization of waste bamboo powder. High-purity cellulose nanofiber (CNF) was obtained by using alkali, bleaching and acid hydrolysis treatments on waste bamboo powder. The purification effect and environmental impact of CNF were compared by different bleaching methods. The optimal conditions (containing 5 wt% H 2 O 2 , 0.04 wt% MgSO 4 and 0.05 wt% TAED) for CNF purification were determined. This work aims to investigate the effect of CNF and wollastonite (WS) on the sulfate resistance of metakaolin (MK) geopolymer. The deterioration mechanism of geopolymer reinforced by natural fiber (CNF and WS) exposed to sulfate environment was revealed by employing XRD , SEM and MIP . The influence of extreme sulfate environment on mechanical properties and microstructure was investigated. The analysis results of microstructure, mass loss rate and mechanical properties were also combined to evaluate the sulfate resistance. The outcomes show that the bleaching method of H 2 O 2 can effectively remove impurities and enhance the purification effect of CNF. The optimum mix proportion of MK geopolymer reinforced by natural fiber (formulated as 2% of CNF, 10% of WS and 88% of MK) is obtained. The compressive and flexural strengths are increased by up to 76.1% and 135.5% (compared to the control group), respectively. The deterioration of geopolymer is related to the concentration of Na 2 SO 4 and the immersion time. The degradation mechanism is attributed to the incomplete geopolymerization and the destruction of the pore structure due to sulfate attack exposure. The deterioration processes of geopolymer can be slowed down by introducing WS and CNF. It improves the sulfate resistance of the matrix from the structural aspect.
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2022
·Vol. 30
·期 1
·141-152
·
IF 6.123
Chang Longjun,Sun Yong,Gan Linhuo
To clarify the formation of pseudo-lignin during pretreatment is vital to high-value utilization of lignocellulose. In this study, hydrothermally treated bamboo and α -cellulose were employed to investigate the generation of pseudo-lignin during deep eutectic solvent (DES) treatment. It is found that pseudo-lignin not only contains some characteristic substructures of natural lignin, but also has the structural characteristics of phenol-type oxygenated and furan-type compounds. It is proposed that chloride anion probably stimulates the deconstruction of crystalline cellulose to form pseudo-lignin. Besides, it’s suggested that the change in lignin content can be reflected from the viewpoint of acid-soluble lignin to minimize the interference from pseudo-lignin, and there may exist a competition between 5-chloromethylfurfural production and pseudo-lignin formation. This study provides a feasible route to produce pseudo-lignin from α -cellulose via DES and contributes to a better understanding of pseudo-lignin formation.
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Ziyu Bian,Yinghui Li,Hongling Sun,Mengyu Shi,Yanjun Zheng,Hu Liu,Chuntai Liu,Changyu Shen
Conductive hydrogels (CHs) have attracted considerable attentions in the fields of wearable electronics, disease diagnosis, and artificial intelligence. However, it is still a great challenge to prepare a single CH system with integrated characteristics of high stretchability, good transparency, and multisensory function through a simple fabrication process. Herein, carboxylic cellulose nanofibers (CCNF) were used to assist the homogeneous distribution of opaque conductive poly(3,4-ethylenedioxythiophene): poly(styrene sulfonate) (PEDOT: PSS) into the crosslinked polyacrylamide network for the fabrication of stretchable and transparent interpenetrating network CH, aiming for a high-performance multisensory system. As expected, the ready formation of hydrogen bonds between the water molecules and a great deal of hydrophilic groups in the hydrogel endow the obtained CH with excellent humidity response behavior in a wide range (0–85%), and the introduction of CCNF and PEDOT: PSS is proved to be an effective strategy to enhance the humidity sensitivity, exhibiting great potential for the noncontact sensing of human respiration and finger movement. Meanwhile, it also displays excellent strain sensing behavior with favorable sensitivity in a broad range (0–837 %), fast response and reliable stability and reproducibility. Importantly, our prepared CH can also detect and discriminate complicated human activities and physiological signals. All these demonstrate the superiority of our prepared CH for the new generation of flexible wearable electronics.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Tariq Aziz,Arshad Farid,Sampath Chinnam,Fazal Haq,Mehwish Kiran,Ab Waheed Wani,Zeid A. Alothman,Ahmed Muteb Aljuwayid,Mohamed A. Habila,Muhammad Saeed Akhtar
Green and efficient removal of polluted materials are essential for the sustainability of a clean and green environment. Nanomaterials , particularly cellulose nanocrystals (CNCs), are abundant in nature and can be extracted from various sources, including cotton, rice, wheat, and plants. CNCs are renewable biomass materials with a high concentration of polar functional groups. This study used succinic anhydride to modify the surface of native cellulose nanocrystals (NCNCs). Succinic anhydride has been frequently used in adhesives and sealant chemicals for a long time, and here, it is evaluated for dye removal performance. The morphology and modification of CNCs studied using FTIR, TGA & DTG, XRD, SEM, AFM, and TEM . The ability of modified cellulose nanocrystals (MCNCs) to adsorb cationic golden yellow dye and methylene blue dye was investigated. The MCNCs exhibited high adsorption affinity for the two different cationic dyes. The maximum adsorption efficiency of NCNCs and MCNCs towards the cationic dye was 0.009 and 0.156 wt%. The investigation for adhesive properties is based on the strength and toughness of MCNCs. MCNCs demonstrated improved tensile strength (2350 MPa) and modulus (13.9 MPa) using E−51 epoxy system and a curing agent compared to 3 wt% composites. This research lays the groundwork for environmentally friendly fabrication and consumption in the industrial sector.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Qingshuang Zhao,Ting Xu,Meng Zhang,Huayu Liu,Haishun Du,Chuanling Si
Construction of composite Zn anode with highly conductive frame can effectively homogenize the interfacial electric field and charge distribution, thereby effectively inhibiting the formation of dendrites of aqueous Zn-ion batteries. Herein, highly conductive nanocellulose-based carbon aerogels with honeycomb porous structure and high specific surface area were synthesized by bidirectional freezing and carbonization. Dendrite-free Zn@Carbon Aerogel (Zn@CA) composites were prepared by facile electrodeposition. Benefiting from the ordered porous structure of nanocellulose-based carbon aerogels, Zn was uniformly dispersed on carbon aerogels. The carbon aerogels with connected conductive network can adjust the nucleation sites of Zn, thus inhibiting the formation of dendrites. Zn@CA composite electrode material exhibits high specific surface area and hydrophilicity (water contact angle of 37.8°), and owns rapid electron transfer channels. The assembled symmetrical cells with Zn@CA electrodes exhibit lower polarization voltage, excellent cycling performance, and almost 100% Coulombic efficiency as well as fast electrochemical kinetics during repeated Zn plating/stripping processes for 13,000 cycles.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）