Biosynthesis and characterization of bacteria cellulose–alginate film

Abstract

A novel polysaccharide membrane containing alginate in bacterial cellulose matrix was synthesized by Acetobacter xylinum under static conditions using a culture medium supplementation with sodium alginate. By increasing alginate content, the bacterial cellulose-alginate (BCA) membrane was more hydrophilic and the film structure became denser with the smaller average pore size. Scanning electron microscope images displayed the deposits of alginate gel on the surfaces of the multilayer cellulose film. The declines in the tensile strength, the Young's modulus, and the elongation at break of the BCA membrane were dependent on the degree of alginate supplement. The BCA membrane showed higher water absorption capacity. The addition of alginate slightly affected the water vapor transmission rate but remarkably decreased the oxygen transmission rate of the membrane.

Never-dried bacterial cellulose/fibrin composites: preparation, morphology and mechanical properties

“…This result confirms that various compositions of BC/fibrin composites can be produced by simply varying the initial fibrin composition in the fibrin solutions and by varying the immersion time of BC in the fibrin solutions. This result was expected and consistent with other studies where BC composites were obtained by incorporating polymers in BC microporous structure (Whitney et al 1998;Maeda et al 2006;Barud et al 2007;Brown andLaborie 2007, 2008;Maneerung et al 2008;Phisalaphong and Jatupaiboon 2008;Hu et al 2009;Kanjanamosit et al 2010). Physical and morphological characterization of composites of known composition was subsequently conducted within this composition range.…”

Development of bacterial cellulose/alginate nanocomposite membrane for separation of ethanol–water mixtures

“…(Figs. 2 and 3) show a dense network of cellulose fibers of 194 diameter $50-100 nm, which were similar to those of previous 195 studies [36]. Small spaces/pores between the woven fibers are 196 clearly visible on the surface of the unmodified BC ( Fig.…”

“…The surface areas and pore diameters 203 of the membranes after modification decreased from 2.6 to 204 $1.0 m 2 /g and from $264 to $28 Å , respectively, because of filling 205 of the pore spaces and voids between the thin cellulose sheets, as 206 shown in the SEM images. Similar results have been reported for 207 the biosynthesis of BC/alginate films; the average pore size and 208 surface area decreased with increasing alginate content [36]. The 209 pore size distribution obtained by BET analysis is shown in 210 Fig.…”

“…On 32 the other hand, hydrophobic polymeric membranes composed of 33 polydimethylsiloxane (PDMS) were reported for the pervaporative 34 separation and concentration of ethanol and butanol in fermenta-35 tion broths [29,30]. 36 The nanomaterial bacterial cellulose (BC), commonly known by 37 the name of ''Nata-de-coco'' is synthesized by Acetobacter xylinum; 38 it has several advantageous properties such as high chemical 39 stability, heat resistance, and water-retention capacity, and good 40 mechanical properties [31][32][33]. BC mechanical strengths and 41 Young's moduli of 200-300 MPa and 15-35 GPa, respectively, have 42 been reported [31].…”

Dispersion and Beating of Bacterial Cellulose and their Influence on Paper Properties

“…The cationic charge demand reflects the specific surface area through the surface charge of the fibers as well as the dispersion degree of the BC suspension (Bhardwaj et al 2007;Kanjanamosit et al 2010). As shown in Fig.…”