No abstract

No abstract

Bacterial cellulose (BC) has profound applications in different sectors of biotechnology due to its unique properties preferring it about plant cellulose.Although this polymer is extremely important in various applications, many problems still hinder the sustainable production in terms of increasing productivity and low-cost production. In order to overcome these problems, this study will focuses on the continuous production of cellulose using immobilized Glucanobacter xylinum cells onto Sugar Cane Bagasse (SCB) and Ca-alginate beads. Comparatively, adsorption of Glucanobacter xylinum cells to the cavum of stalk cells of SCB could be efficiently stable while, entrapment of cells onto Ca-alginate has drawback observed by the rapid disruption and instability of the beads in the Potato Peel Waste (PPW) culture medium. Our findings demonstrate that a combination between alternative low-cost medium with continuous production mode by immobilization onto inexpensive natural polymer can promote a sustainable bioprocess and reduction the production cost.

Bacterial Cellulose (BC) is still the most renewable available biopolymer produced in fine nature from alternative microbial sources as bacteria. In the present study, newly BC producing bacteria were successfully isolated from acidic fruits. The most potent producer was isolated from strawberry and identified genetically using 16 s rRNA technique as Achromobacter S3. Different fruit peels were screened to produce BC using the cheapest culture medium. Among them, Mango peel waste (MPW) hydrolysate proved to be the significant inducible alternative medium without any extra nutrients for the maximum productivity. Improvement of the BC yield was successfully achieved via statistical optimization of the MPW culture medium, from 0.52 g/L to 1.22 g/L with 2.5-fold increased about the standard HS culture medium. Additionally, the physicochemical analysis affirmed the cellulose molecular structure as well as observed the crystallinity of nanofiber as 72 and 79% for BC produced by Achromobacter S33 on HS and MPW media, respectively. Moreover, the topographical study illustrated that the BC nanofibers had close characteristics upon fiber dimeter and length as about 10 and 200 nm, respectively.

No abstract

The purpose of this study is to improve the surface structure of rice husks, using solid state fermentation (SSF), as eco-treatment process compared to conventional chemical treatments (alkali, and acidic treatments). ii) Main Methods A mixed culture of Aspergillus awamori and Cunninghamella elegans in SSF was a proper organisms isolated and used in this investigated treatment. All media used for solid state fermentation were prepared by substituted the carbon source in the foregoing media by RHs fibers, and the incubation period 7 days at 30 o C. The beneficial effect of investigated treatment was evaluated by comparing the chemical constituents, IR measurements, thermal stability using non-isothermal thermogravimetric technique, and surface imaging using scanning electron microscope of the treated fibers, with that produced from conventional chemical treated fibers. iii) Key Findings The results showed that the investigated biological treatment had positive effect for removing the hemicelluloses and lignin, with preserving the strength of fibers, compared to chemical treated RH. The FTIR-and TGA-measurements, as well as SEM, evident this view. These results suggest a promising hope that offers the possibility of producing valuable cellulosic material from Egyptian agro-wastes that eventually will be highly amenable for several industries that may improve the Egyptian economy. iv) Significance The studies performed should assist future efforts toward applying new biological treatment for RHs fibers, for further application. In addition, application of the extreme processing conditions to traditional one could prove interesting.

Biopolymers have attracted much of interest in various applications needed for sustainable and biodegradable solutions. Indeed, biopolymers lessen the requirement for petroleum‐based resources, municipal solid waste output, and carbon dioxide emissions. Polysaccharides are a unique category of biopolymers that are especially characteristic such as biocompatibility and editability. Polysaccharides functionalization plays a significant role in various applications and their suitability for additive applications. Sensor‐based polysaccharides are widely used with many drawbacks localized in durability, moldability, and sensitivity. Otherwise, biosensors are devices monitoring a specimen's biological phenomena or measurements, usually not disposable devices. For that, biosensors are needed urgently to address the high cost of disposable supplies in the medical diagnostic industry, which span many elements of medical diagnostic applications. Additionally, manipulating of polysaccharide‐based materials is considered accessible and usable and requires low equipment requirements. Herein the main features of polysaccharides will be discussed, along with potential applications as biosensors for medical diagnosis and new lines of inquiry with such focus on the main required to formulate polysaccharides biosensors.This article is protected by copyright. All rights reserved

The paper coating is an out-layer of the paper that plays an important role in a paper’s properties, functionality and application. The nanocoating is a multifunction layer that supplied the paper with unique features. In this present work, nanocoating formulas were prepared using a green method and component as well. The nanocoating formulas were based on biopolymers (nanostarch and nanochitosan) decorated with Egyptian kaolinite doped with zinc nanoparticles (Ka/ZnONPs) as support for multifunctional uses. The nanocoating formulas were characterized using a physiochemical analysis as well as a topographical study. Additionally, the prepared nanocoating formulas affirmed an excellent antimicrobial activity as a broad-spectrum antimicrobial active agent with excellent activity against all representative microbial communities. Besides, the coated paper's optical, mechanical and physical properties were improved.