Abstract
The aim of the study was to assess the influence of rotating magnetic field (RMF) on the morphology, physicochemical properties, and the water holding capacity of bacterial cellulose (BC) synthetized by Gluconacetobacter xylinus. The cultures of G. xylinus were exposed to RMF of frequency that equals 50 Hz and magnetic induction 34 mT for 3, 5, and 7 days during cultivation at 28°C in the customized RMF exposure system. It was revealed that BC exposed for 3 days to RMF exhibited the highest water retention capacity as compared to the samples exposed for 5 and 7 days. The observation was confirmed for both the control and RMF exposed BC. It was proved that the BC exposed samples showed up to 26% higher water retention capacity as compared to the control samples. These samples also required the highest temperature to release the water molecules. Such findings agreed with the observation via SEM examination which revealed that the structure of BC synthesized for 7 days was more compacted than the sample exposed to RMF for 3 days. Furthermore, the analysis of 2D correlation of Fourier transform infrared spectra demonstrated the impact of RMF exposure on the dynamics of BC microfibers crystallinity formation.
Highlights
Bacterial cellulose (BC) is an exopolysaccharide which can be produced by various species of bacteria; only Gluconacetobacter xylinus has been considered as a model microorganism for its production and analysis [1]
We demonstrated that the constant exposure to the rotating magnetic field (RMF) for 3 days resulted in the cellulose yield characterized by higher water absorption, lower density, and less interassociated microfibrils comparing to the unexposed control [31]
Summarizing, the current study intends to produce BC with altered morphology, physicochemical properties, the water retention and holding capacity synthesized in G. xylinus cultures exposed to the RMF of 50 Hz frequency, and magnetic induction of 34 mT for 3, 5, and 7 days
Summary
Bacterial cellulose (BC) is an exopolysaccharide which can be produced by various species of bacteria; only Gluconacetobacter xylinus has been considered as a model microorganism for its production and analysis [1]. The cellulose produced by G. xylinus exhibits high purity, high degree of crystallinity, high density, good shape retention, high water binding capacity, and higher surface area as compared to the plant cellulose [2, 3] Due to these properties the BC has a wide range of potential applications including artificial skin [2, 4], dental implants [5], dialysis membrane [5, 6], coatings for cardiovascular stents [5], membranes for tissue-guided regeneration [2, 5], controlled-drug release carriers [5], vascular prosthetic devices [7], scaffolds for tissue engineering [2], wound dressing [5, 8, 9], and artificial blood vessels [10, 11]. The integration of the optical activity [15], electrical conductivity [16], magnetic nanoparticles [17], or photocatalytic degradation [18] materials to the BC matrix for various applications has been studied
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