The crystal and supramolecular structure of the bacterial cellulose (BC) has been studied at different stages of cellobiohydrolase hydrolysis using various physical and microscopic methods. Enzymatic hydrolysis significantly affected the crystal and supramolecular structure of native BC, in which the 3D polymer network consisted of nanoribbons with a thickness T ≈ 8 nm and a width W ≈ 50 nm, and with a developed specific surface SBET ≈ 260 m2·g−1. Biodegradation for 24 h led to a ten percent decrease in the mean crystal size Dhkl of BC, to two-fold increase in the sizes of nanoribbons, and in the specific surface area SBET up to ≈ 100 m2·g−1. Atomic force and scanning electron microscopy images showed BC microstructure “loosening“after enzymatic treatment, as well as the formation and accumulation of submicron particles in the cells of the 3D polymer network. Experiments in vitro and in vivo did not reveal cytotoxic effect by the enzyme addition to BC dressings and showed a generally positive influence on the treatment of extensive III-degree burns, significantly accelerating wound healing in rats. Thus, in our opinion, the results obtained can serve as a basis for further development of effective biodegradable dressings for wound healing.

The results of three-year research on the use of allogeneic mesenchymal stem cells of adipose tissue (AMSCs) in the treatment of skin burns of II-III degree are presented. in a complex with wounds dressing of nanofibers chitosan and copolyamide, hyaluronic acid. It was found that with surgical necrectomy, introduction of AMSCs and substitution of defects with natural polymer coatings, the healing time is reduced by 89% (p < 0.05). Isolated administration of MSC reduces the healing period by no more than 5% (p > 0.05). The combined use of wounds dressings of nanofibers chitosan and copo lyamide with MSC accelerates the regeneration process by 26% (p < 0.05), with the introduction of AMSCs accelerating the development of granulation tissue by the fifth day of observation by 83% (p < 0.01). Joint use of wound coverings on the basis of hyaluronic acid with AMSCs is accompanied by an increase in the number of vessels of the microcirculatory bed in the defect area by 185% (p < 0.01). Clinical evaluation of the effectiveness of drugs with stem cells – a gel for topical application and a suspension of MSC LC for injection administration demonstrate their ability to optimize regeneration in the burn zone. Application of gel with AMSCs reduces the duration of epithelialization of border (dermal) burns by 2.2-2.4 times, with the final healing period being reduced by 59% (p < 0.01) and the suppuration frequency by 30% (p < 0.05). The introduction of a suspension of AMSCs into the zone of deep burn increases the frequency of engraftment of autografts, stimulates angiogenesis and proliferation of fibroblasts in the superficial and deep layers of the dermis. In the area of MSC administration, the LC perfusion level and the amplitude of blood flow fluctuation are twice as high as the values in the zones without the introduction of cells.

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of low-temperature air plasma of an atmospheric pressure arc discharge for treatment of thirddegree skin burns in laboratory rats. Thermal skin burns were produced by our own original p < 0.05) p < 0.01).

The paper presents the results of an experimental study on the effect of a variable frequency-modulated electric field on the course of a wound process in a burn wound. The evaluation of the effectiveness of the antimicrobial action of wound healing agents against the background of an alternating frequency-modulated electric field has been carried out. The bacteriostatic effect of some wound healing agents used in combination with electrical physical and antiseptic action has been proven.