In vitro biological activities of potassium metaborate; antioxidative, antimicrobial and antibiofilm properties

Antioxidant, antimicrobial and antibiofilm activities of potassium metaborate (KBO2) was investigated within the present study. Antioxidant capacity of potassium metaborate was determined by β-carotene bleaching (BCB) assay and hydroxyl radical scavenging activity. Potassium metaborate was evaluated for its antimicrobial effects against selected Gram-positive bacteria, Gram-negative bacteria and a yeast via broth dilution method. The inhibition capability of potassium metaborate on the microbial biofilm formation of tested microorganisms was measured by microplate biofilm method using MTT (3- [4, 5- dimethyl-2-thiazolyl]-2, 5-diphenyl-2H-tetrazolium-bromide). Biofilm inhibition capacity of potassium metaborate was also observed by Scanning Electron Microscope (SEM). Potassium metaborate was found to have the ability to scavenge hydroxyl radicals with an inhibition rate of 71.13% at 100 mM concentration. Antioxidant activity of potassium metaborate as determined by BCB assay gave higher result with an inhibition rate of 86.96% at the same concentration. According to the MIC (minimum inhibition concentration) values, the potassium metaborate inhibited the growth of C. albicans, S. aureus and E. coli at 62.5 mM concentrations while it was 31.25 mM for B. subtilis and 125 mM for P. aeruginosa. The highest antibiofilm activity was determined at the MIC of potassium metaborate with the reduction rate of 90.18% against C. albicans. It was concluded that, potassium metaborate have strong biological activities and can be effectively used for biomedical and environmental solutions

Antibiofilm Evaluation of Two Different Denture Liners Incorporated with Zirconium Oxide Nanoparticles

Abstract Objectives: This in vitro study was purposed to examine the effects of incorporation nano-ZrO2 on antibiofilm activity, glucose sorption, weight change, and surface roughness of two different types of denture liners. Materials and Methods: Modified nano-ZrO2 were added to silicone-based and acrylic resin-based prosthetic lining materials at two different concentrations (0.5% and 1%). The antibiofilm potentials of test groups against Candida albicans (C. albicans), Staphylococcus aureus (S. aureus), and Streptococcus mutans (S. mutans) were determined using 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium (MTT) method. Surface roughness, weight change, and glucose sorption of denture liners were also evaluated after modifying with nano-ZrO2. Results: According to the antibiofilm activity results, 1% nano-ZrO2 addition to silicon-based and acrylic resin-based denture liners resulted in 16.48% and 13.39% of biofilm inhibition for S. aureus, respectively. 1% nano-ZrO2 addition to silicon-based denture liners also inhibited the S. mutans biofilm formation at an 8.16% rate. Nano-ZrO2 addition to the test groups had no inhibition effect on C. albicans biofilm formation. Surface roughness decreased significantly once nano-ZrO2 was added in tissue conditioner test groups (p=0.012), however, the addition of 0.5% nano-ZrO2 increased soft denture liner test group significantly (p<0.001). Conclusions: To overcome the microbial biofilm problems (especially against S. aureus and S. mutans) caused by the use of denture liners, addition of nano-ZrO2 might be a promising agent with its antibiofilm capacities

Antimicrobial activities of the essential oils of endemic Stachys rupestris and Stachys amanica against multi-resistant bacteria

WOS: 000317003600023PubMed: 2371690

İki doğal polisakkaritin hiyalüronidaz, kollajenaz ve elastaz inhibitör potansiyellerinin araştırılması ve antimikrobiyal, antioksidan ve homeostatik aktivitelerinin karşılaştırmalı olarak değerlendirmesi

The aim of this study was to investigate the hyaluronidase, collagenase and elastase inhibitory effects, which play important role for wound healing, together with the antibacterial, antioxidant and homeostatic activities of tragacanth gum (TG) and locust bean gum (LBG). The antimicrobial activities were tested against four bacteria and the antioxidant activities were estimated by the 1,1-diphenyl-2-picrylhydrazyl (DPPH), hydrogen peroxide (H2O2) radical scavenging and β-carotene bleaching assays. Homeostatic effect was evaluated with the Prothrombin Time (PT) and Activated Partial Thromboplastin Time (aPTT) test parameters. The wound healing potentials were determined with the inhibition of hyaluronidase, collagenase and elastase enzymes. The TG showed antibacterial activity against Pseudomonas aeruginosa ATCC27853 and Escherichia coli ATCC25922. The results showed that TG and LBG possessed antioxidant properties including DPPH scavenging (21.0% and 17.6%, respectively) and H2O2 radical scavenging (59.4% and 79.0%, respectively) activities. The polysaccharides displayed significantly reducing PT and aPTT results. Between the two tested polysaccharides LBG showed significant hyaluronidase and collagenase inhibition activity at 10 mg/mL concentration. These findings show that these natural polysaccharides can be used to support of wound healing.Bu çalışmanın amacı, kitre zamkı (TG) ve keçiboynuzu zamkı (LBG)'nin antibakteriyel, antioksidan ve homeostatik aktiviteleri ile birlikte yara iyileşmesi için önemli olan hiyalüronidaz, kollajenaz ve elastaz inhibitör etkilerini araştırmaktır. Antimikrobiyal aktiviteleri dört bakteriye karşı test edilerek, antioksidan aktiviteleri 1,1-difenil-2-pikrilhidrazil (DPPH), hidrojen peroksit (H202) radikal temizleme ve βkaroten ağartma deneyleri ile tespit edilmiştir. Homeostatik etki Protrombin Zamanı (PT) ve Aktive Edilen Kısmi Tromboplastin Zamanı (aPTT) test parametreleri ile değerlendirilmiştir. Yara iyileştirme potansiyelleri ise, hiyalüronidaz, kollajenaz ve elastaz inhibisyonu ile belirlenmiştir. TG, Pseudomonas aeruginosa ATCC27853 ve Escherichia coli ATCC25922'ye karşı antibakteriyel aktivite göstermiştir. Sonuçlar TG ve LBG'nin DPPH temizleme (sırasıyla %21.0 ve %17.6) ve H2O2 radikal temizleme (sırasıyla %59.4 ve %79.0) aktiviteleri de dahil olmak üzere antioksidan özelliklere sahip olduğunu göstermiştir. Polisakkaritler, PT ve aPTT'de önemli azalma göstermiştir. Test edilen iki polisakkarit arasından LBG, 10 mg/mL konsantrasyonda, önemli hiyalüronidaz ve kollajenaz inhibisyon aktivitesi göstermiştir. Bu bulgular, bu doğal polisakkaritlerin yara iyileşmesini desteklemek için kullanılabileceğini göstermektedir

Characterisation of streptomyces violascens OC125-8 lipase for oily wastewater treatment

WOS: 000454678300005PubMed: 30622843In this study, the lipase-producing bacterium Streptomyces violascens (GenBank number MF621564) was identified, and the extracellular S. violascens OC125-8 lipase produced by this strain was characterised for use in wastewater treatment. The lipase was partially purified by ammonium sulphate precipitation at a final yield of 3.28-fold purification and a recovery of 56%. The S. violascens OC125-8 lipase exhibited optimum catalytic activity at 40 degrees C and pH 8.0; it was stable at 30-40 degrees C with more than 86% residual activity after 1h; it was also stable over a relatively broad pH range of pH 7.0-11.0, retaining 83.3-100% activity. V-max and K-m values were calculated as 0.61 mu mol/min/mg and 0.259mM, respectively. Enzyme activity significantly increased in the presence of Fe2+ ion but was inhibited by Ca2+, Mn2+, Cu2+ and Mg2+. The addition of a serine protease inhibitor, phenylmethylsulfonyl fluoride (PMSF), strongly inhibited enzyme activity while ethylenediaminetetraacetic acid (EDTA), a metal chelating agent, had no inhibitory effect. The enzyme was fairly stable in the presence of surfactants as well as sodium perborate. Examination of commercial detergent tolerance revealed that the lipase was strongly stable in Tursil (88%), Pril (97%) and Fairy (98.5%), while the lipase was activated in Omo (113.4%) and Ariel (128.3%). Moreover, the lipase showed highest activity towards olive oil (100%), sunflower oil (90%) and burned sunflower oil (55%), while corn oil (44%) and burned olive oil (15%) were less hydrolysed by the enzyme. These properties demonstrate that S. violascens OC125-8 lipase is an ideal choice for oily wastewater management

Ankaferd Blood Stopper with antibiofilm potential successfully inhibits the extracellular matrix degradation enzymes and promotes wound healing of 3T3 fibroblasts in vitro

WOS: 000435653900026PubMed: 29916223Background/aim: The potential inhibitory effects of Ankaferd Blood Stopper (ABS) against biofilm formation of oral microorganisms and its capacity for collagenase, hyaluronidase, and elastase inhibitions that have important roles in wound healing have been investigated. Materials and methods: The wound healing potential was determined by its inhibition ability on collagenase, hyaluronidase, and elastase enzyme activities and was evaluated via scratch wound healing assay on murine 3T3 fibroblasts. The antibiofilm activity was tested against eight oral microorganisms using the crystal violet staining method. Results: At 10% ABS successfully inhibited the biofilm formation of the tested microorganisms. Enzyme inhibition analysis revealed that 3% ABS significantly inhibited all three enzymes related to wound healing. The scratch assay showed that wound closure was faster than that of the control for the 3% ABS/plate. Conclusion: The findings of the present study indicated that ABS has effective wound healing potential with its strong antibiofilm activity against oral cavity microorganisms

The Use of boron compounds for stabilization of lipase from pseudomonas aeruginosa ES3 for the detergent industry

WOS: 000349915500010This study aimed to characterize a lipase that is highly active and stable under typical washing conditions for use as a detergent ingredient by investigating the effects of various boron compounds on lipase stabilization under different conditions. In addition, the antimicrobial activity of the boron compounds used in enzyme stabilization was examined in order to obtain an effective antimicrobial detergent. A lipase-producing bacterium was isolated from kitchen wastewater samples using Rhodamine-B Agar medium and identified as Pseudomonas aeruginosa based on 16S rDNA sequence analysis. The ES3 lipase obtained from P. aeruginosa was purified, and the purified enzyme was found to have a molecular mass of 40 kDa. The enzyme showed optimal activity at pH 9.0-10.0 and 40 A degrees C and remained stable in the presence of various metal ions, surfactants and oxidizing agents. Moreover, the pH stability and thermostability of the enzyme was improved by the addition of boron compounds, which, when used as stabilizers in the incubation media, also increased the stability of the enzyme towards commercial detergents. Furthermore, the enzyme displayed properties comparable with the commercial product Lipolase(A (R)), which has shown excellent stability towards various commercial detergents. Finally, boron compounds used to stabilize the lipase were found to possess antimicrobial properties, suggesting that detergents incorporating these compounds will also exhibit antimicrobial activity when washing clothes and dishes.TUBITAK, The Scientific and Technical Research Council of Turkey [TBAG- 210T084]This work was supported by TUBITAK, The Scientific and Technical Research Council of Turkey, through the Grant number TBAG- 210T084