-->Separation of Biomass Components and High Value Utilization of Materials

Self-assembly of Natural Polymer-embedded Single Cells for Biomedical Applications

HE Bin,FANG Yifan,CHENG Lin,ZHENG Xulei,WANG Keyao,ZHU Xing,SONG Shunxi — 2024/3/26 0:00:00

Layer-by-Layer self-assembly method for preparation of natural polymer functionalized materials has emerged as a promising research direction in recent years， owing to its straight forward operation， gentle reaction conditions， and flexibility in adapting the shell layer structure. This review outlined the use of natural polymers like starch， chitosan， sodium alginate， gelatine， and cellulose to create single-cell shell layers through electrostatic Layer-by-Layer self-assembly. It also discussed the impact of the self-assembly process on the properties such as cell activity and pH tolerance， offering insight into the potential application of immobilized cells in biomedicine.

Study on Purification and Thermal Stability of Ethanol Oligosaccharides from Corn Stover

SHEN Qiu,PING Qingwei,ZHANG Jian,SHENG Xueru,LI Na — 2024/3/26 0:00:00

In this study， ethanol oligosaccharides extracted from the waste liquid of corn stover ethanol pulping as raw materials were purified by resins， and fractionated to obtain the components with molecular weight of 200~1000 D. By testing the thermal stability of oligosaccharides at different heating rates and calculating by nonlinear fitting， the pyrolysis activation energy （E） and pre-exponential factors （lnA） of oligosaccharides were obtained. The results showed that the decomposition temperature range of purified and fractionated oligosaccharides was 160~300 ℃ under non-isothermal procedures， and the thermal stability of oligosaccharides decreased when the ash content increased. The E values of unpurificated oligosaccharides O₀， desalinated oligosaccharides B₀， decolorized oligosaccharides C₀ and desalinated and decolorized oligosaccharides D₀ after fractionation were 46.52， 60.55， 43.12 and 52.28 kJ/mol， respectively， and the pre-exponential factors （lnA） were 4.03， 7.70， 2.98 and 5.47 min^-1， respectively. This study and results could provide reference for the purification and the selection of technological parameters.

Study on Performance of Digital Printing Waste Paper Fiber-reinforced PLA Composite Films

2024/3/26 0:00:00

Waste paper fiber/PLA composite films were prepared from digital printing waste paper and polylactic acid （PLA） by melt blending and hot press molding. The effects of different waste paper fiber additions and different modifiers on the performance of composite films were investigated by adding silane coupling agents， including γ-glycidyl ether oxypropyltrimethoxysilane （KH560）， vinyltrimethoxysilane （A171）， isopropyltris（dioctylpyrophosphoryloxy）titanate （TMC201） and xylanase， respectively. The mechanical properties， opacity， chemical structure and thermal stability of composite films before and after modification were investigated. The results showed that the tensile strength of the composite films was the best when the mass fraction of waste paper fiber was 25%， reaching 21.6 MPa， which was 94.7% higher than that of the pure PLA film. The opacity of the waste paper fiber increased to 95.5% when the mass fraction of waste paper fiber was 20%. Moreover， the tensile strengths of the composite films were all improved to different degrees after the modified treatment of the waste paper fiber， among which the modification of KH560 was the best， with the tensile strength of the composite films （the mass fraction of waste paper fiber of 25%） reaching 24.7 MPa， an increase of 14.4% compared to the non-modified composite films. The modified treatment did not affect the opacity and thermal stability of the composite films.

Research Progress on Extraction of Hemicelluloses by Combined Pretreatment

TANG Derong,CHEN Tianying,LI Mian,YANG Wulong,TANG Yanjun — 2024/3/26 0:00:00

Hemicellulose is rich in content with broad application prospects. However， the structure of hemicellulose is complex and diverse， and its high-value utilization is a long-standing challenge. When a single physical， chemical or biological pretreatment was used to extract hemicellulose， there were some limitations in terms of energy consumption， cost and effect. Combined pretreatment could combine the advantages of various pretreatment methods and reduce the limitations of single pretreatment. Thus， combined strategy method had become the current research hotspot for hemicellulose extraction. This paper reviewed the combined pretreatment extraction process of hemicellulose in the wood fiber， such as ultrasound-assisted， microwave-assisted， acid-water heat treatment and alkaline-water heat treatment， etc.， and briefly described the advantages and disadvantages of the various pretreatment methods， with a view to providing theoretical guidance for the extraction and application of hemicellulose.

Study on the Removal of Lignin Derivatives from Corn Stalk Hydrolysate via Flocculation Treatment by Egg White Protein

ZHAO Min,CHEN Yan,WANG Gaosheng,YU Menghui — 2024/3/26 0:00:00

In order to improve the biodegradability of corn stalk hydrolysate （CSH）， the effect of egg white protein （EWP） flocculation treatment on the removal of lignin derivatives from CSH was studied and compared with general flocculant FeCl₃ and CPAM. The results showed that EWP thermal flocculation treatment （heating at 100 ℃ for 5 min） was used in the CSH with original COD_Cr concentration of 40 g/L， the removal rate of macromolecular lignin （calculated by turbidity） could reach （76.87±3.00）%， which was significantly better than that of FeCl₃ and CPAM （P<0.05）. At the same time， EWP thermal flocculation treatment did not cause obvious loss of sugar， furan， and weak acid. Due to the sulfhydryl-disulfide bond cross-linking between EWP and lignin derivatives， macromolecular compounds formed via hydrophobic reaction， which promoted the removal of lignin derivatives from CSH.

Study on Preparation of Furfural Residue-based Magnetic Porous Carbon and Its Adsorption Properties

WANG Qi,ZHANG Xin,JIANG Weikun,WANG Xiaohui,LIU Yu,WANG Huimei — 2024/3/26 0:00:00

The magnetic porous carbon was prepared using furfural residue as raw material by impregnation with nickel chloride and activation with zinc chloride. The results showed that the prepared porous carbon was magnetic with rich functional groups and many pores. When the mass ratio of raw material after impregnation to zinc chloride was 1∶2， the specific surface area could reach 1051 m²/g. The adsorption capacity of methylene blue could be as high as 732.5 mg/g at 45 ℃， and the adsorption process conformed to the pseudo second-order kinetic and Langmuir isothermal adsorption models.