Journal of Bioresources and Bioproducts最新文献

Lignocellulose is the main component of plants and has a wide range of sources. The high-value production of lignocellulose lies in the biorefinery of lignin, cellulose and hemicellulose. The advantages and disadvantages of traditional lignocellulose pretreatment methods were summarized, and the effective pretreatment parameters were listed. As a green solvent system with excellent performance, deep eutectic solvents (DES) are considered to be the most potential biomass pretreatment system. Based on this, the new trend and progress of DES in lignocellulose pretreatment were reviewed, focusing on the effects of distinct kinds of lignocellulose raw materials, distinct components of DES, distinct reaction conditions and assisted by microwave ultrasound on the pretreatment of lignocellulose, and the recyclability of DES solution system was discussed. Finally, the application and development direction of DES in lignocellulose pretreatment are proposed and prospected.

The Salvadora persica (S. persica) L. chewing stick, usually known as miswak, is still being employed as an oral hygiene agent for plaque and gingivitis prevention. This study aims to assess the antibacterial, antibiofilm, antioxidant, and phytochemical profile of S. persica extract. The S. persica was purchased from a local market, grinded and extracted with petroleum ether. The disk diffusion, microdilution, and micro-plate assays were performed to evaluate the antibacterial and antibiofilm activities of the prepared extract at different concentrations against β-lactam resistance Streptococcus species. Free radical scavenging 2,2-diphenyl-1-picrylhydrazyl (DPPH) and stable radical cationic chromophore, 2,2-azinobis-(3-ethylbenzothiazoline-6-sulfonate) (ABTS) methods were used to determine their antioxidant activity. Chromatographic and spectrometric analyses were performed using gas chromatography-mass (GC-MS) spectrometry. The minimum inhibitory concentration (MIC) of S. persica extract against β-lactam resistance Streptococcus species ranged from 6.25 to 12.5 mg/mL. The maximum suppression of biofilm formation by S. persica extract was observed at MIC with a percentage of 68.66%, against Streptococcus oralis. The S. persica extract exhibited antioxidant activity with IC₅₀ of 20 µg/mL and 35 µg/mL from DPPH and ABTS, respectively. The phytochemical characterization showed the presence of 22 compounds with major compounds; benzyl isothiocyanate (36.21%) and n-hexadecanoic acid (27.62%). The S. persica extract exhibited antibacterial activity against β-lactam resistant Streptococcus species, showing a promising natural alternative that could be a treatment option.

Mycelium bio-composites was developed by incubating Pleurotus ostreatus fungi on different substrates from agricultural residual byproducts, including rice straw, bagasse, coir-pith, sawdust, and corn straw. The scanning electron microscope (SEM) results showed that the hypha of composite derived from bagasse was the densest, and the diameter of hypha was the biggest (0.77 µm), which was presumably due to the existence of cellulose in bagasse in the form of dextran and xylan. The maximum and minimum compression strength for sawdust substrate and corn straw substrate were 456.70 and 270.31 kPa, respectively. The flexural strength for bagasse substrate and rice straw substrate were 0.54 and 0.16 MPa, respectively. The two composites derived from rice straw and bagasse exhibited higher hydrophobic properties than others. In comparison, mycelium bio-composite derived from bagasse showed the best comprehensive properties. Except for a little worse anti-creep ability and waterproof performance, other properties of mycelium bio-composites could be comparable to commercially expanded polystyrene (EPS) packaging material. Derived from this study, mycelium material provided a good way to use agricultural residual byproducts and could be a good alternative to non-biodegradable materials for packaging applications.

As the most abundant natural polymer material on the earth, cellulose is a promising sustainable sensing material due to its high mechanical strength, excellent biocompatibility, good degradation, and regeneration ability. Considering the inherent advantages of cellulose and the success of modern sensors, applying cellulose to sensors has always been the subject of considerable investigation, and significant progress has been made in recent decades. Herein, we reviewed the research progress of cellulose functional materials (CFMs) in recent years. According to the different sources of cellulose, the classification and preparation methods for the design and functionalization of cellulose were summarized with the emphasis on the relationship between their structure and properties. Besides, the applications of advanced sensors based on CFMs in recent years were also discussed. Finally, the potential challenges and prospects of the development of sensor based on CFMs were outlined.

With the increasing demand for sustainable energy storage systems, the development of various advanced materials from a renewable source is imminent. Owing to the advantages of high specific surface area, unique nanostructure, modifiability, and excellent mechanical strength, nanocellulose integrated with other conductive materials, such as nanocarbons, conducting polymers, and metal oxides, has been emerged as promising candidate materials for green and renewable energy storage devices. Besides, nanocellulose-derived carbon materials with good electrical conductivity and tunable microstructures can be fabricated via simple carbonization, which has been widely used as supercapacitor electrode materials. Herein, we present a comprehensive review that focuses on the development of nanocellulose materials for sustainable energy storage, particularly on supercapacitors. The fabrication strategies of nanocellulose-derived hybrid materials are first presented and summarized, followed by highlighting the use of natural nanocellulose for constructing composite electrode materials including two-dimension film electrodes, and three-dimension aerogel electrodes for supercapacitors. In addition, the possible limitations and potentials of nanocellulose in supercapacitors are outlooked.

Traditionally, Laurus nobilis is used for the treatment of earaches and skin rashes as well as rheumatism. The most common technique to isolate the oil is hydro-distillation and steam-distillation. The investigation presented in this paper was aimed to unravel the antimicrobial activity and chemical composition of essential oil in the leaves of L. nobilis grown in Oman. The essential oil was extracted from the leave of the selected plant species by hydro distillation using Clevenger type apparatus. The antimicrobial assay was done by disc diffusion methods against three bacterial strains, Staphylococcus aureus, Pseudomonas aeruginosa and Escherichia coli, and one fungal strain: Candida albicans. The isolated essential oil was analyzed by gas chromatography-mass spectrometry (GC-MS). The percentage yield of the essential oil was 0.064% (w/w). The essential oil was found actively against the applied bacterial and fungal strains. The highest activity was found against S. aureus and the lowest was against E. coli, and the order was S. aureus > P. aeruginosa > E. coli. The essential oil was also active against the fungus C. albicans. The range of inhibition zones was 6–14 mm. The results of GC-MS analysis showed (E)-β-caryophyllene to be the major component about 59.62%. Other major components included α-selinene (14.03%), α-humulene (8.65%), β-selinene (4.99%), and α-pinene (4.98%). In addition, several minor components were found in the essential oil of L. nobilis. Based on the experimental results, it showed that the plant species that grown in Oman were a potential source of therapeutic agents. In conclusion, the essential oil and the plant could be used as natural and potential therapeutic agents to treat earaches, skin rashes, and rheumatism.