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Phenolic plant extract enrichment of enzymatically mineralized hydrogels

100%

Douglas T. E. L. , Lopez-Heredia M. A. , Pułczyńska A. , Łapa A. , Pietryga K. , Schaubroeck D. , Santos S. A. O. , Pais A. , Brackman G. , Schamphelaere K. d. , Samal S. K. , Keppler J. K. , Bauer J. L. , Chai F. , Blanchemain N. , Coenye T. , Pamuła E. , Skirtach A. G.

2019

tom Vol. 22, no. 149

2--9

Hydrogel mineralization with calcium phosphate (CaP) and antibacterial activity are desirable for applications in bone regeneration. Mineralization with CaP can be induced using the enzyme alkaline phosphatase (ALP), responsible for CaP formation in bone tissue. Incorporation of polyphenols, plant-derived bactericidal molecules, was hypothesized to provide antibacterial activity and enhance ALP-induced mineralization. Three phenolic rich plant extracts from: (i) green tea, rich in epigallocatechin gallate (EGCG) (herafter referred to as EGCG-rich extract); (ii) pine bark and (iii) rosemary were added to gellan gum (GG) hydrogels and subsequently mineralized using ALP. The phenolic composition of the three extracts used were analyzed by ultra-high-performance liquid chromatography coupled to tandem mass spectrometry (UHPLC-MSn). EGCG-rich extract showed the highest content of phenolic compounds and promoted the highest CaP formation as corroborated by dry mass percentage meassurements and ICP-OES de-termination of mass of elemental Ca and P. All three extracts alone exhibited antibacterial activity in the following order EGCG-rich > PI > RO, respectively. However, extract-loaded and mineralized GG hydro-gels did not exhibit appreciable antibacterial activity by diffusion test. In conclusion, only the EGCG-rich extract promotes ALP-mediated mineralization.

Manufacturing and characterization of gellan gum – zinc oxide composites as potential biomaterials for wound treatment

84%

Macyk A. , Kusibab A. , Pamuła E.

tom vol. 26, no. 168

2--8

This study aimed to produce gellan gum-based hydrogels with the addition of zinc oxide as a potential dressing material. Hydrogels with ZnO concentrations of 0.01%, 0.02% and 0.04% were prepared, micrometric and nanometric ZnO particles were used, and a CaCl2 crosslinker was added to one part of the samples. All samples (14 types) produced by the freeze drying method were characterized with high swelling properties (>2000%), what is important to ensure the absorption of exudates from wounds. Samples with ZnO particles cross-linked with CaCl2 lost less mass after incubation in aqueous media and were characterized by better dimensional stability than those without crosslinking. The pH of the extracts of the samples containing ZnO particles was more neutral (pH 7.0-7.6) than that of the control gellan gum samples (pH of 5.5-6.1). The zinc release from cross-linked samples was twice as high for those containing nanometric particles than for micrometric particles (1.94 ± 0.04 mg/l and 0.93 ± 0.02, respectively). Relatively large amounts of released zinc species in the case of samples containing ZnO nanoparticles are promising in the context of the antibacterial properties and treatment of infected wounds. A lower amount of zinc released from samples with ZnO microparticles could be sufficient to prevent the development of the infection. Furthermore, both materials show satisfactory cytocompatibility with L929 fibroblasts, as shown by Alamar blue and live/dead viability tests, making them prospective candidates for wound healing

Wykorzystanie biodegradowalnych polimerów w rozmnażaniu ozdobnych roślin cebulowych

84%

Salachna P.

tom Nr 46

143--148

Syntetyczne regulatory wzrostu mają negatywny wpływ na środowisko stąd coraz częściej w ogrodnictwie wykorzystuje się naturalne biostymulatory. Niektóre naturalne polimery wykazują stymulujący wpływ na wzrost i rozwój roślin. Związki te mogą być stosowane do tworzenia hydrożelowych otoczek na powierzchni organów roślinnych w celu ochrony przed niekorzystnym wpływem czynników zewnętrznych. Gatunki eukomis są powszechnie stosowane w tradycyjnej medycynie Afryki Południowej i znajdują szerokie zastosowanie jako ozdobne rośliny cebulowe. Celem badań było określenie wpływu otoczkowania w biopolimerach sadzonek dwułuskowych dwóch odmian eukomis czubatej (‘Sparkling Burgundy’ i ‘Twinkly Stars’) na plon i jakość uzyskanych cebul przybyszowych. Sadzonki otoczkowano w 1% roztworze gumy gellanowej (Phytagel) lub 0,5% roztworze oligochitozanu. Stwierdzono, że otoczkowanie sadzonek w gumie gellanowej miało stymulujący wpływ na liczbę i masę cebul przybyszowych. Najsilniejszy system korzeniowy wytworzyły cebule uformowane na sadzonkach otoczkowanych w oligochitozanie. Porównując odmiany wykazano, że ‘Sparkling Burgundy’ wytworzyła więcej cebul, które jednocześnie miały większą masę i dłuższe korzenie niż ‘Twinkly Stars’.

Synthesized growth regulators may cause a negative impact on the environment so the use of natural bio-stimulators in horticulture is becoming more popular. Some biopolymers can have a stimulating influence on the growth and development of plants. In addition, polymers can be used to form hydrogel coatings on the surface of plant organs to protect them against the adverse influence of external factors. Eucomis species are widely used in southern African traditional medicine and have a horticultural potential. This study was conducted in order to determine the effect of biopolymer coating of twin-scale cuttings on the yield of Eucomis comosa ‘Sparkling Burgundy’ and ‘Twinkly Stars’ bulblets. For coating of twin-scale cuttings, 1% solution of gellan gum (Phytagel) or 0.5% solution of oligochitosan were used. Coating of twin-scale cuttings in gellan gum had a positive impact on the number and weight of the bulblets. The highest number of roots and maximum root length were observed in bulblets derived from the twin scale cuttings coating in oligochitosan. A comparison of cultivars showed that ‘Sparkling Burgundy’ produced more bulblets with longer roots than ‘Twinkly Stars’.