Bacterial cellulose (BC) can be produced by an agitated or static fermentation process in presence of suitable media. Groups of microorganisms such as fungi, bacteria, and algae are responsible for the synthesis of BC. Under agitated cultivation, BC yield is enhanced as compared to static cultivation. BC is pure cellulose, so it can easily interact with hydrophilic or hydrophobic biopolymers. In this review paper, we have discussed the preparation and characterization of BC reinforced biopolymer (polylactic acid, cellulosic fibers, agar, and Mater-Bi) based biocomposites and biopolymer (natural rubber, chitosan, polycaprolactone, hydroxyapatite) reinforced BC-based biocomposites related research carried out in last 2 decades. The high moisture content of BC results in reduced compatibility to most hydrophobic biopolymers as compared to hydrophilic biopolymers. Mechanical properties of BC before and after reinforcement were compared as it is important parameters in the production of green composites with targeted application in tissue engineering, wound dressing, dental implants, artificial blood vessels, surgical mesh, bone fillings, heart valve, and artificial cartilage. This review paper will help in exploring various applications of BC-based biocomposites in addition to several parameters that affect the production of BC.

Microorganisms create various health issues; semiconductor nanostructures have raised interest because of antimicrobial properties for suppressing microbial growth. Herein, we report the synthesis of ZnSe nanostructures (NSs) using a green coprecipitation method, and the assynthesized samples were annealed at 100, 150, and 200 °C temperatures. The synthesized samples were analyzed for structural, morphological, optical, and antibacterial properties. The growth of nanorods was confirmed by TEM micrographs and that of nanoparticles by FESEM and TEM micrographs. The cubic zinc blender phase of samples was confirmed by XRD. The high-intensity electron−phonon (e−ph) interactions and LO modes were confirmed by the Raman spectra. The UV−visible absorption spectra predicted the blue shift in optical band gaps of ZnSe NSs from their bulk counterparts. The PL spectra and associated CIE diagram indicated that the as-synthesized and annealed NSs produce blue color. The investigated antimicrobial activity against Escherichia coli, Pseudomonas aeruginosa, and Staphylococcus aureus implies the superior biological activity of the as-synthesized and annealed samples at 200 °C. The annealing enhances photoluminescence and antimicrobial activities of ZnSe NSs. The enhanced luminscence properties of ZnSe NSs make them suitable for preparing more efficient blue LEDs and lasers for medical applications. The as-synthesized and annealed ZnSe NSs are found effective against the growth of microorganisms, and sustaining this tendency for 1 week provides a strong basis for the development of new drugs against bacterial infections for supporting the pharmaceutical industry.

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