The global energy crisis has intensified the need for sustainable energy solutions, yet conventional energy production still relies on non-renewable, environmentally damaging materials. Although significant advances h...
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The global energy crisis has intensified the need for sustainable energy solutions, yet conventional energy production still relies on non-renewable, environmentally damaging materials. Although significant advances have been made in green energy technologies, a critical gap remains in the development of materials that are both renewable and environmentally friendly. Bio-based materials, derived from renewable resources, offer a timely and sustainable alternative that can significantly improve the efficiency, functionality, and environmental compatibility of energy conversion devices. This review highlights the role of bio-based materials in addressing these challenges, focusing on their applications in emerging green energy technologies, particularly triboelectric nanogenerators (TENGs), piezoelectric nanogenerators (PENGs), and solar-powered seawater desalination systems. It provides a comprehensive overview of the latest advances in preparation methods, material properties, and their practical applications in energy conversion systems. By discussing the unique advantages and material selection challenges, this review underscores the importance of bio-based materials in the continued development of sustainable, high-performance energy harvesting devices. Furthermore, it emphasizes their potential to contribute to global sustainability goals, offering a critical pathway to more eco-friendly and cost-effective energy solutions.
Amine transaminases(ATAs)catalyze the asymmetric amination of prochiral ketones or aldehydes to their corresponding chiral ***,the trade-off between activity and stability in enzyme engineering represents a major obst...
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Amine transaminases(ATAs)catalyze the asymmetric amination of prochiral ketones or aldehydes to their corresponding chiral ***,the trade-off between activity and stability in enzyme engineering represents a major obstacle to the practical application of *** this trade-off is important for developing robustly engineered enzymes and a universal approach for ***,we modified the binding pocket of co-ATA from Aspergillus terreus(AtATA)to identify the key amino acid residues controlling the activity and stability of AtATA toward *** discovered a structural switch comprising four key amino acid sites(R128,V149,L182,and L187),as well as the"best"mutant(AtATAD224K/V149A/L182 F/L187F;termed M4).Compared to the parent enzyme AtATAD224K(AtATAPa),M4 increased the catalytic efficiency(k_(cat)/K_(m)^(1-acetonaphthone),where kcatis the constant of catalytic activities and is 10.1 min^(-1),K_(m)^(1-acetonaphthoneis) Michaelis-Menten constant and is 1.7 mmol·L^(-1))and half-life(t1/2)by 59-fold to 5.9 L·min^(-1)·mmol-1and by 1.6-fold to 46.9 min,***,using M4 as the biocatalyst,we converted a 20 mmol·L^(-1)aliquot of 1-acetonaphthone in a 50 mL scaled-up system to the desired product,(R)-(+)-1(1-naphthyl)ethylamine((R)-NEA),with 78%yield and high enantiomeric purity(R>99.5%)within 10 h.M4 also displayed significantly enhanced activity toward various 1-acetonaphthone *** related structural properties derived by analyzing structure and sequence information of robust ATAs illustrated their enhanced activity and *** of intramolecular interactions and expansion of the angle between the substratebinding pocket and the pyridoxal 5’-phosphate(PLP)-binding pocket contributed to synchronous enhancement of ATA thermostability and ***,this pocket engineering strategy successfully transferred enhanced activity and thermostability to three other ATAs,which exhibited 8%-22%sequence simila
Chitosan-based nanofibers are widely used in the antibacterial field. Chitosan has good biodegradability, non-toxicity, antibacterial properties, high safety, and environmental friendliness. The nanofiber structure ca...
Chitosan-based nanofibers are widely used in the antibacterial field. Chitosan has good biodegradability, non-toxicity, antibacterial properties, high safety, and environmental friendliness. The nanofiber structure can achieve better surface interactions and enhance the inhibition of bacteria. However, due to the rigidity and ionic structure of chitosan, the production of chitosan-based nanofibers is challenging. By mixing chitosan with different polymers and antibacterial agents, the spinnability of the nanofibers can be optimized, and their antibacterial performance can be improved. This article first briefly describes the antibacterial mechanism of chitosan. Then, it introduces the influence of chitosan from different sources on antibacterial activity, the intrinsic factors affecting the antibacterial property of chitosan, the influence of structural modification of chitosan on antibacterial performance, and the influence of chitosan crosslinking agents on the mechanical properties and antibacterial performance of nanofibers. Subsequently, it elaborates on the progress of research on the antibacterial properties of chitosan-based nanofibers from two dimensions: chitosan-based binary antibacterial and chitosan-based ternary antibacterial. Finally, it analyzes the main challenges faced by the commercialization of electrospun chitosan-based nanofibers and looks forward to the development direction of chitosan-based antibacterial nanofibers.
The food’s perishable properties and people’s eco-friendly requirements have driven the biodegradable active packaging *** this study,modification behaviors of polyviniyl alcohol/hydroxypropyl methylcellulose/rosell...
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The food’s perishable properties and people’s eco-friendly requirements have driven the biodegradable active packaging *** this study,modification behaviors of polyviniyl alcohol/hydroxypropyl methylcellulose/roselle anthocyanin-based(PHR)film on textural profiles of Penaeus vannamei were *** samples were packaged by PHR film with different roselle anthocyanin contents and stored at 4±1℃.The results indicated that PHR groups exhibited better texture with higher values of hardness(435.56±75.52 g),springiness(0.53±0.04 mm),chewiness(198.83±40.98 N)and resilience(0.45±0.04).The PHR film exerted positive influences on water migration by reducing drip loss and promoting conversion of free water into immobilized ***,the PHR film retarded protein denaturation via increasing myofibrillar protein and sulfhydryl group contents,decreasing TCA(trichloroacetic acid)-soluble peptide contents and maintaining protein secondary structure(higherα-helix ratio and lowerβ-sheet ratio).In conclusion,the PHR film improved shrimp texture by rearrangement of water distribution and stabilization of protein ***,the PHR film was a novel potential active packaging for shrimp texture enhancement.
An innovative iron-based alloy powder characterized by reduced carbon content and elevated Mn content was developed, leading to the fabrication of iron-based ultrafine bainitic steel with exceptional mechanical proper...
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