Growth Of Porphyromonas Gingivalis Research Articles

Biofunctionalization of dental abutments by a zinc/chitosan/gelatin coating to optimize fibroblast behavior and antibacterial properties.

Tightly sealed peri-implant gingival tissue provides a barrier against oral bacterial invasion, protecting the alveolar bone and maintaining long-term implant survival. To investigate if zinc can enhance the integration between peri-implant gingival tissue and abutment surface, we herein present novel zinc/chitosan/gelatin (Zn/CS/Gel) coatings prepared using the electrophoretic deposition (EPD) technique. The effect of these coatings on human gingival fibroblasts (hGFs) was investigated by culturing these cells on top of the EPD coatings. Surface characterization demonstrated that Zn2+ were released in a sustained and pH-responsive manner. The preclinical cell culture evaluation of these coatings indicated that the zinc-containing coatings enhanced cell migration, adhesion and collagen secretion of hGFs. Moreover, the zinc-containing coatings exhibited antibacterial efficacy by inhibiting the growth of Porphyromonas gingivalis and reducing attachment of Staphylococcus aureus. Notably, zinc-free CS/Gel coatings prevented attachment of P. gingivalis as well. The coatings were also shown to be cytocompatible with epithelial cells and osteoblasts, which are other relevant cell types which surround dental implants after clinical placement. Based on our findings, it can be concluded that Zn-containing coatings hold promise to enhance the adhesion of gingival tissue to the implant surface, which may potentially contribute to the formation of a robust peri-implant soft sealing counteracting bacterial invasion.

Frankincense (Boswellia serrata) Extract Effects on Growth and Biofilm Formation of Porphyromonas gingivalis, and Its Intracellular Infection in Human Gingival Epithelial Cells.

Frankincense is produced by Boswellia trees, which can be found throughout the Middle East and parts of Africa and Asia. Boswellia serrata extract has been shown to have anti-cancer, anti-inflammatory, and antimicrobial effects. Periodontitis is an oral chronic inflammatory disease that affects nearly half of the US population. We investigated the antimicrobial effects of B. serrata extract on two oral pathogens associated with periodontitis. Using the minimum inhibitory concentration and crystal violet staining methods, we demonstrated that Porphyromonas gingivalis growth and biofilm formation were impaired by treatment with B. serrata extracts. However, the effects on Fusobacterium nucleatum growth and biofilm formation were not significant. Using quantification of colony-forming units and microscopy techniques, we also showed that concentrations of B. serrata that were not toxic for host cells decreased intracellular P. gingivalis infection in human gingival epithelial cells. Our results show antimicrobial activity of a natural product extracted from Boswellia trees (B. serrata) against periodontopathogens. Thus, B. serrata has the potential for preventing and/or treating periodontal diseases. Future studies will identify the molecular components of B. serrata extracts responsible for the beneficial effects.

Synthesis of secretory leukocyte protease inhibitor using cell-free protein synthesis system.

Secretory leukocyte protease inhibitor (SLPI) functions as a protease inhibitor that modulates excessive proteolysis in the body, exhibits broad-spectrum antimicrobial activity, regulates inflammatory responses, and plays an important role in the innate immunity. The purpose of the study was to artificially synthesize a SLPI, an antimicrobial peptide, and investigate its effect on antimicrobial activity against Porphyromonas gingivalis and interleukin-6 (IL-6) production. SLPI protein with a molecular weight of approximately 13kDa was artificially synthesized using a cell-free protein synthesis (CFPS) system and investigated by western blotting and enzyme-linked immunosorbent assay (ELISA). Disulfide bond isomerase in the protein synthesis mixture increased the amount of SLPI synthesized. The synthesized SLPI (sSLPI) protein was purified and its antimicrobial activity was investigated based on the growth of Porphyromonas gingivalis and bacterial adhesion to oral epithelial cells. The effect of sSLPI on IL-6 production in human periodontal ligament fibroblasts (HPLFs) was examined by ELISA. Our results showed that sSLPI significantly inhibited the growth of Porphyromonas gingivalis and bacterial adhesion to oral epithelial cells and further inhibited IL-6 production by HPLFs. These results suggested that SLPI artificially synthesized using the CFPS system may play a role in the prevention of periodontal diseases through its antimicrobial and anti-inflammatory effects.

Injectable Nanocomposite Hydrogels with Strong Antibacterial, Osteoinductive, and ROS-Scavenging Capabilities for Periodontitis Treatment.

Injectable antibacterial and osteoinductive hydrogels have received considerable attention for promoting bone regeneration owing to their versatile functionalities. However, a current hydrogel with antibacterial, osteoinductive, and antioxidant properties by a facile method for periodontitis treatment is still missing. To overcome this issue, we designed an injectable hydrogel system (GPM) composed of gelatin, Ti3C2Tx MXene nanosheets, and poly-l-lysine using a simple enzymatic cross-linking technique. Physicochemical characterization demonstrated that the GPM hydrogel matrix exhibited excellent stability, moderate tissue adhesion ability, and good mechanical behavior. The GPM hydrogels significantly inhibited the growth of Porphyromonas gingivalis, scavenged reactive oxygen species, attenuated inflammatory responses, and enhanced bone tissue regeneration. Intriguingly, the arrangement of the junctional epithelium, alveolar bone volume, and alveolar bone height in the GPM-treated periodontal disease group recovered to that of the healthy group. Therefore, our injectable hydrogel system with versatile functions may serve as an excellent tissue scaffold for the treatment of periodontitis.

ANTIBACTERIAL EFFECTIVENESS TEST OF KECAPI LEAVES EXTRACTS (Sandoricum koetjape) AGAINST THE GROWTH OF Porphyromonas gingivalis

Background: Chronic periodontitis is a disease of the oral cavity that is influenced by the presence of plaque bacteria caused by Porphyromonas gingivalis which can cause chronic infection of the periodontal tissue. Kecapi leaf (Sandoricum koetjape) extract contains active compounds in the form of flavonoids, saponins, alkaloids, steroids, phenolics, and triterpenoids which function as antibacterial against the growth of Porphyromonas gingivalis. Kecapi leaf extract is used as an alternative to using herbal gluconate to prevent infection caused of Porphyromonas gingivalis. Purpose: To determine the antibacterial effectiveness of kecapi leaf extract against bacterial growth of Porphyromonas gingivalis. Methods: This study used a pure experimental research (true experimental) with post-test only with control design, consists of 7 treatment groups, including: concentrated kecapi leaf extract 5%, 10%, 15%, 25%, 50%, chlorhexidine gluconate 0.2% as positive control, and distilled water as negative control. It was repeated 7 times, the antibacterial effectiveness was assessed from Minimum Inhibitory Concentration (MIC) and Minimum Bactericidal Concentration (MBC) on BHIB and NA media by dilution method. Results: MIC on kecapi leaf extract at a concentration of 5% showed the smallest result of -0.147 and the MBC value at a concentration of 50% did not show the growth of bacterial colonies. Conclusion: Kecapi leaf extract with concentrations of 5%, 10%, 15%, 25%, 50%, and positive control was effective in inhibiting and killing bacterial growth of Porphyromonas gingivalis. Keywords: Antibacterial, Kecapi leaf extract, Porphyromonas gingivalis

Inhibitory Effects of the Heat-Killed Lactic Acid Bacterium Enterococcus faecalis on the Growth of Porphyromonas gingivalis

OBJECTIVESThe effects of heat-killed Enterococcus faecalis (HkEf), a lactic acid bacterium, on the growth of Porphyromonas gingivalis were evaluated in vitro by measuring the viable cell count of P. gingivalis and gingipain activity. METHODSHkEf solution (1.63 or 163 mg/mL) was added to 1 mL P. gingivalis culture to generate a final HkEf concentration of 0.64 or 64 mg/mL. The cultures were incubated anaerobically. The number of viable P. gingivalis cells and gingipain activity were measured after incubation for 0, 12, 24, 48, and 72 h. The number of viable P. gingivalis cells was calculated by counting the number of colonies after culture. Gingipain activity was quantified by adding a chromogenic substrate to P. gingivalis culture medium and measuring the absorbance of the reaction solution with a plate reader. Mean ± SE was calculated for viable cell counts and gingipain activity, and Wilcoxon rank sum test was used to test for significant differences. RESULTSThe counts of viable P. gingivalis cells in the control group increased as incubation time progressed for 12, 24, 48, and 72 h; similar results were observed in the low-concentration HkEf group. In the high-concentration HkEf group, the increase in the viable cell count was significantly inhibited compared to that of the control group. Furthermore, gingipain activity in the low- and high-concentration HkEf groups was significantly inhibited over time compared to that of the control group. Although the pH of the culture solution tended to decrease in the high-concentration HkEf group, it was not considered to have affected the growth of P. gingivalis. CONCLUSIONSHkEf exhibits inhibitory effects on the growth of P. gingivalis and gingipain activity.

Metronidazole-loaded polydopamine nanomedicine with antioxidant and antibacterial bioactivity for periodontitis.

Aim: This study focused on treating periodontitis with bacterial infection and local overaccumulation ofreactive oxygen species. Materials & methods: Polydopamine nanoparticles (PDA NPs) were exploited asefficient carriers for encapsulated metronidazole (MNZ). The therapeutic efficacy and biocompatibilityof PDA@MNZ NPs were investigated through both in vitro and in vivo studies. Results: The nanodrugPDA@MNZ NPs were successfully fabricated, with well-defined physicochemical characteristics. In vitro, the PDA@MNZ NPs effectively eliminated intracellular reactive oxygen species and inhibited the growthof Porphyromonas gingivalis. Moreover, the PDA@MNZ NPs exhibited synergistic therapy for periodontitisin invivo. Conclusion: PDA@MNZ NPs were confirmed with exceptional antimicrobial and antioxidantfunctions, offering a promising avenue for synergistic therapy in periodontitis.

Antibacterial test of Peperomia pellucida (L.) Kunth extract against Porphyromonas Gingivalis as a potential herb for periodontitis: a laboratory experiment

ABSTRACTIntroduction: Periodontitis is a multifactorial inflammatory disease which is generally caused by plaque accumulation. Many studies have shown that Porphyromonas gingivalis (Pg) is the main etiological agent that contributes to chronic periodontitis. Scaling and root planing (SRP) is the gold standard for periodontitis treatment. The use of antibiotics as additional agents accompanying the SRP procedure has limitations that can cause resistance to subgingival periodontal pathogens. Peperomia pellucida (L.) Kunth i.e betel leaf is a natural ingredient that contains anti-inflammatory, antibacterial and antioxidant properties. This study aimed to analyze the inhibition of Peperomia pellucida (L.) Kunth extract against Pg bacteria. Methods: The type of study used was an experimental laboratory with a Post-Test Control Group Design research design which was divided into 6 treatment groups using the disk diffusion method with concentrations of Peperomia pellucida (L.) Kunth extract 25, 50, 75 and 100%, sterile aquades as a negative control and Chlorhexidine as a positive control. Data analyses of One Way Anova and Post Hoc Tukey were used Results: Peperomia pellucida (L.) Kunth extract concentrations of 25, 50, 75, and 100% had an effect on reducing the growth of Porphyromonas gingivalis (p≤0,05), the average inhibition response was 14.40 mm at 25% concentration, 16.58 mm at 50% concentration and 19.30 mm at 75%, 21.88 mm at 100% concentration.Conclusion: Peperomia pellucida (L.) Kunth extract has an antibacterial effect against Porphyromonas gingivalis which has the potential to be used as a periodontitis herb.Keywords: Betel leaf extract Peperomia pellucida (L.) Kunth, periodontitis, Porphyromonas gingivalis.

Antimicrobial photodynamic therapy with dendrosomal curcumin and blue laser against Porphyromonas gingivalis

BackgroundPeriodontitis is a chronic inflammatory disease that leads to the loss of tooth-supporting structures. Porphyromonas gingivalis is one of the main pathogens responsible for periodontitis. Because of the limitations of antibiotic use, various alternative approaches have been developed. Antimicrobial photodynamic therapy uses photosensitizers and light to eliminate pathogens. Curcumin is a promising photosensitizer, but has low bioavailability and water solubility. However, dendrosomes can efficiently encapsulate curcumin, overcoming these obstacles. This study aimed to evaluate the efficacy of photodynamic therapy with blue laser and dendrosomal curcumin against Porphyromonas gingivalis. MethodsIn this in vitro experiment, the minimum inhibitory concentration (MIC) of dendrosomal curcumin was determined using a serial dilution approach. Porphyromonas gingivalis suspensions were subjected to blue laser irradiation (447 nm, output power 100 mW) for 30 to 180 s. Finally, several subMIC dendrosomal curcumin concentrations and blue laser irradiation periods were applied to the bacterial suspensions. The negative control group received no therapy, whereas the positive control group was treated with 0.2% chlorhexidine. Consequently, the colony count of each group was calculated. ResultsTreatment of Porphyromonas gingivalis with dendrosomal Curcumin at concentrations of 8–250 μg/mL significantly reduced bacterial growth compared to untreated group. 90 second exposure to a blue laser (31.8 J/cm2) completely inhibited the growth of Porphyromonas gingivalis. Blue laser irradiation for 60 s (21.2 J/cm2) markedly reduced bacterial growth but did not completely prevent its survival. Photodynamic therapy using dendrosomal curcumin at concentrations of 2–4 μg/mL and irradiation for 30–90 s resulted in complete eradication of Porphyromonas gingivalis compared to controls (P < 0.05). ConclusionThe reduction in survival of Porphyromonas gingivalis following photodynamic therapy with dendrosomal curcumin and blue laser indicates that this technique could be a useful approach to eradicate Porphyromonas gingivalis infections.

The Bacteroidetes Q-rule and glutaminyl cyclase activity increase the stability of extracytoplasmic proteins.

Exclusively in the Bacteroidetes phylum, most proteins exported across the inner membrane via the Sec system and released into the periplasm by type I signal peptidase have N-terminal glutamine converted to pyroglutamate. The reaction is catalyzed by the periplasmic enzyme glutaminyl cyclase (QC), which is essential for the growth of Porphyromonas gingivalis and other periodontopathogens. Apparently, pyroglutamyl formation stabilizes extracytoplasmic proteins and/or protects them from proteolytic degradation in the periplasm. Given the role of P. gingivalis as the keystone pathogen in periodontitis, P. gingivalis QC is a promising target for the development of drugs to treat and/or prevent this highly prevalent chronic inflammatory disease leading to tooth loss and associated with severe systemic diseases.

Therapeutic Potential of Chlorhexidine-Loaded Calcium Hydroxide-Based Intracanal Medications in Endo-Periodontal Lesions: An Ex Vivo and In Vitro Study.

Endo-periodontal lesions are challenging clinical situations where both the supporting tissues and the root canal of the same tooth are infected. In the present study, chlorhexidine (CHX)-loaded calcium hydroxide (CH) pastes were used as intracanal medications (ICMs). They were prepared and tested on pathogens found in both the root canal and the periodontal pocket. Exposure to 0.5% and 1% CHX-loaded ICMs decreased the growth of Porphyromonas gingivalis and was effective in eradicating or inhibiting an Enterococcus faecalis biofilm. CH was injected into the root canal of extracted human teeth immersed in deionized water. CHX-loaded ICMs resulted in the transradicular diffusion of active components outside the tooth through the apex and the lateral dentinal tubules, as shown by the release of CHX (from 3.99 µg/mL to 51.28 µg/mL) and changes in pH (from 6.63 to 8.18) and calcium concentrations (from 2.42 ppm to 14.67 ppm) after 7 days. The 0.5% CHX-loaded ICM was non-toxic and reduced the release of IL-6 by periodontal cells stimulated by P. gingivalis lipopolysaccharides. Results indicate that the root canal may serve as a reservoir for periodontal drug delivery and that CHX-based ICMs can be an adjuvant for the control of infections and inflammation in endo-periodontal lesions.

Oxygen-Releasing Hyaluronic Acid-Based Dispersion with Controlled Oxygen Delivery for Enhanced Periodontal Tissue Engineering.

Periodontitis is a chronic biofilm-associated inflammatory disease of the tooth-supporting tissues that causes tooth loss. It is strongly associated with anaerobic bacterial colonization and represents a substantial global health burden. Due to a local hypoxic environment, tissue regeneration is impaired. Oxygen therapy has shown promising results as a potential treatment of periodontitis, but so far, local oxygen delivery remains a key technical challenge. An oxygen (O2)-releasing hyaluronic acid (HA)-based dispersion with a controlled oxygen delivery was developed. Cell viability of primary human fibroblasts, osteoblasts, and HUVECs was demonstrated, and biocompatibility was tested using a chorioallantoic membrane assay (CAM assay). Suppression of anaerobic growth of Porphyromonas gingivalis was shown using the broth microdilution assay. In vitro assays showed that the O2-releasing HA was not cytotoxic towards human primary fibroblasts, osteoblasts, and HUVECs. In vivo, angiogenesis was enhanced in a CAM assay, although not to a statistically significant degree. Growth of P. gingivalis was inhibited by CaO2 concentrations higher than 256 mg/L. Taken together, the results of this study demonstrate the biocompatibility and selective antimicrobial activity against P. gingivalis for the developed O2-releasing HA-based dispersion and the potential of O2-releasing biomaterials for periodontal tissue regeneration.

Bovine Milk and Yogurt Affect Oral Microorganisms and Biofilms In-Vitro.

To evaluate the effect of bovine milk and yogurt on selected oral microorganisms and different oral biofilms. Milk was prepared from 0.5% fat (low-fat) and 16% fat (high fat) milk powder. For yogurt preparation, the strains Lactobacillus delbrueckii ssp. bulgarcius and Streptococcus thermophilus were added to the milk. Minimal inhibitory concentrations (MIC) and minimal microbiocidal concentrations (MMC) of the test compounds were measured against various microorganisms by the microbroth dilution technique. Cariogenic periodontal biofilms and one containing Candida were created on plastic surfaces coated with test substances. Further, preformed biofilms were exposed to the test substances at a concentration of 100% for 10 min and thereafter 10% for 50 min. Both colony forming units (cfu) and metabolic activity were quantified in the biofilms. Neither high-fat milk, low-fat milk nor casein inhibited the growth of any species. Yogurt and L. delbrueckii ssp. bulgaricus at low MIC and MMC suppressed the growth of Porphyromonas gingivalis and other bacteria associated with periodontal disease. High-fat yogurt decreased cfu in the forming periodontal biofilm by 90%. Both low- and high-fat yogurts reduced metabolic activity in newly forming and preformed periodontal and Candida biofilms, but not in the cariogenic biofilm. Yogurt and L. delbru eckii ssp. bulgaricus, but not milk, were bactericidal against periodontopathogenic bacteria. Yoghurt reduced the metabolic activity of a Candida biofilm and a periodontal biofilm. Yogurt and L. delbrueckii ssp. bulgaricus may have potential in prevention and therapy of periodontal diseases and Candida infections.

The inhibitory effect of gourami fish scale (Osphronemus gouramy) extract-curcumin combination on Porphyromonas gingivalis

Background: Gourami fish scales, often considered as a waste, turned out to be an alternative source for antibacterial components. Its extract contains alkaloid, an antibacterial agent, while also contains hydrogen bonds which have the effect of increasing the interaction with other substances. Curcumin is one of the active ingredients of turmeric, a spice commonly used as an herbal medicine in Indonesia. Curcumin could suppress bacterial proliferation by inhibiting virulence agents. The combination of these substances was expected to help inhibit Porphyromonas gingivalis growth, one of the key pathogens in periodontitis patients. Objective: This study aims to determine the inhibitory effect of the gourami fish scale extract-curcumin combination on the growth of P. gingivalis bacteria. Method: This research is an in vitro experimental analytical laboratory research. The concentrations used are 100%; 50%; 25%; 12.5%; 6.25%; 3.125%; 1.56%; and 0.78%. The inhibition testing on P. gingivalis bacteria cultures was carried out by spectrophotometric methods and colony counts. Results: Gourami fish scale extract-curcumin combination with a concentration of 12.5%; 25%; 50%; and 100% killed colonies of P. gingivalis bacteria resulting in 0 colonies. A concentration of 6.25% inhibits bacterial growth by 92.9%. The statistical test result showed a significant difference (p &lt; 0.05). Conclusion: Gourami fish scale extract-curcumin combination has an inhibitory effect on the growth of P. gingivalis bacteria with MIC value at the concentration of 6.25% and MBC of 12.5%.

Atypical cyclic di-AMP signaling is essential for Porphyromonas gingivalis growth and regulation of cell envelope homeostasis and virulence

Microbial pathogens employ signaling systems through cyclic (di-) nucleotide monophosphates serving as second messengers to increase fitness during pathogenesis. However, signaling schemes via second messengers in Porphyromonas gingivalis, a key Gram-negative anaerobic oral pathogen, remain unknown. Here, we report that among various ubiquitous second messengers, P. gingivalis strains predominantly synthesize bis-(3′,5′)-cyclic di-adenosine monophosphate (c-di-AMP), which is essential for their growth and survival. Our findings demonstrate an unusual regulation of c-di-AMP synthesis in P. gingivalis. P. gingivalis c-di-AMP phosphodiesterase (PDE) gene (pdepg) positively regulates c-di-AMP synthesis and impedes a decrease in c-di-AMP concentration despite encoding conserved amino acid motifs for phosphodiesterase activity. Instead, the predicted regulator gene cdaR, unrelated to the c-di-AMP PDE genes, serves as a potent negative regulator of c-di-AMP synthesis in this anaerobe. Further, our findings reveal that pdepg and cdaR are required to regulate the incorporation of ATP into c-di-AMP upon pyruvate utilization, leading to enhanced biofilm formation. We show that shifts in c-di-AMP signaling change the integrity and homeostasis of cell envelope, importantly, the structure and immunoreactivity of the lipopolysaccharide layer. Additionally, microbe–microbe interactions and the virulence potential of P. gingivalis were modulated by c-di-AMP. These studies provide the first glimpse into the scheme of second messenger signaling in P. gingivalis and perhaps other Bacteroidetes. Further, our findings indicate that c-di-AMP signaling promotes the fitness of the residents of the oral cavity and the development of a pathogenic community.

Retraction Note to: A fluorescent Zn(II)-containing coordination polymer for antibiotic sensing and treatment activity on periodontal tissue inflammation after orthodontics by inhibiting the growth of Porphyromonas gingivalis

Retraction Note to: A fluorescent Zn(II)-containing coordination polymer for antibiotic sensing and treatment activity on periodontal tissue inflammation after orthodontics by inhibiting the growth of Porphyromonas gingivalis

Tailoring Copper-Doped Bioactive Glass/Chitosan Coatings with Angiogenic and Antibacterial Properties.

Implant coatings are frequently applied to modulate tissue response and delivery of drugs. Copper (Cu)-containing coatings on dental implant abutments have been proposed to improve soft tissue integration and reduce the risk for peri-implant infections. However, precise control over Cu loading and release kinetics remains a major challenge. In this study, we introduced a bottom-up coating deposition method based on nanoparticle assembly to allow for local release of Cu ions from implant surfaces. We first doped mesoporous bioactive glass (MBG) nanoparticles with various amounts of Cu. Subsequently, we suspended these Cu-doped MBG (Cu-MBG), Cu-free MBG nanoparticles, or mixtures thereof in chitosan solution and prepared a series of composite coatings on commercially pure titanium disks as model surfaces for transmucosal components of bone implants through electrophoretic deposition (EPD). By changing the Cu-MBG:MBG ratio of the composite coatings, we controlled the Cu release kinetics without changing other coating properties. Human gingival fibroblasts proliferated on the composite coatings except for coatings with the highest amount of Cu, which inhibited their proliferation. The migration rate of human umbilical vein endothelial cells cultured on the composite coatings was highest on coatings containing equal amounts of Cu-MBG and Cu-free MBG. Antibacterial tests confirmed that Cu-containing coatings reduced the growth of Porphyromonas gingivalis up to fivefold compared with uncoated implants. In conclusion, our data indicate that the EPD method is suitable to deposit nanoparticle-based coatings onto dental implants, which enhance endothelial cell migration and reduce bacterial growth. Impact statement Precise control over the release of therapeutic agents remains a major challenge for implant coatings. In this study, we introduce a simple and cost-effective way to tune the release of angiogenic and antibacterial copper ions using the electrophoretic deposition technique. Due to the flexibility and mild processing conditions of this technique, our method can also be used to incorporate other therapeutic agents onto implant surfaces.

Glucose-sensitive delivery of tannic acid by a photo-crosslinked chitosan hydrogel film for antibacterial and anti-inflammatory therapy

A glucose-sensitive antibacterial and anti-inflammatory hydrogel film with controlled release of tannic acid (TA) was synthesized using chitosan (CS). Specifically, the photo-crosslinked CS hydrogel was first obtained and then immersed in TA solution to generate composite hydrogel film with enhanced mechanical properties. Subsequently, N-hydroxysuccinimide/1-ethyl-3-(3-dimethylaminopropyl) carbodiimide based coupling chemistry was used to covalently crosslink glucose oxidase (GOx) to CS to obtain glucose sensitivity. The physicochemical properties, including chemical composition, enzyme-related characteristics, glucose responsiveness, and mechanical strength, were thoroughly investigated, followed by the cytotoxicity, antibacterial and anti-inflammatory tests. The results showed that the GOx immobilized on the film surface by covalent bonding gave better stability than those that were physically adsorbed. In addition, it could quickly and correspondingly modify its inner pore structure in response to the glucose stimulus and then control the loaded TA release. Meanwhile, the TA addition could enhance the film's mechanical properties. The composite hydrogel film demonstrated adequate biocompatibility and can inhibit NO, IL-6, and TNF-α production in stimulated macrophages, as well as Porphyromonas gingivalis growth, demonstrating effective antibacterial and anti-inflammatory activity.

Uji Daya Hambat Ekstrak Daun Salam (Syzygium polyanthum wight) Terhadap Pertumbuhan Bakteri Porphyromonas Gingivalis Secara In Vitro

Chronic periodontitis is the most common type of periodontitis. The main cause of chronic periodontitis is bacterial colonization of plaque. Porphyromonas gingivalis is the main pathogen and has the highest prevalence of chronic periodontitis. Bay leaf extract (Syzygium polyanthum wight) is believed to have the pharmacological effect that can be used as antibacterial. The purpose of this research was to determine the inhibitory of bay leaf extract on the growth of Porphyromonas gingivalis in vitro. The method of this research was experimental laboratories with posttest only control group design. There were 30 samples divided into 6 groups, namely bay leaf extract concentration of 2.5%, 5%, 10%, 20%, 40% and Dimethyl Sulfoxide (DMSO) as a control. Inhibitory test using the Kirby-Bauer method with a paper disc on Mueller Hinton medium agar. Inhibition zone that created around paper disc was measured with the sliding caliper. The results were analyzed with One Way Anova and Post Hoc LSD test. The results of this research showed that the mean of bay leaf extract 40% had the largest inhibition zone that was 7,6 mm and the lowest formed by bay leaf extract 2,5% that was 1,94 mm. One Way Anova test showed that there was a significant difference among the group (p&lt;0,05). The conclusion of this research there was significant difference inhibition among 2,5%, 5%, 10%, 20%, and 40% concentration of bay leaf extract on the growth of Porphyromonas gingivalis in vitro. The higher concentration of bay leaf extract resulting the greater inhibition zone.

Daya Hambat Ekstrak Biji Kopi Robusta (Coffea Canephora) terhadap Bakteri Porphyromonas gingivalis (in vitro)

Periodontitis is mostly caused by plaque and Pophyromonas gingivalis bacteria as the main cause. The outer membrane layer of the Porphyromonas gingivalis wall produces pathogenic virulence factors, such as lipopolysaccharides which will activate inflammatory cells and cause phagocytosis of antigens thereby triggering free radicals. Robusta coffee beans naturally contain caffeine, phenolic compounds, trigonellin, and chlorogenic acids as antibacterial and anti-inflammatory. The purpose of this study was to determine the inhibition of Robusta (Coffea canephora) coffee bean extract 0.5%; 0.75%; 1%; 1.25%; 1.5% and 3% on the growth of Porphyromonas gingivalis in vitro and to find out the lowest concentration of Robusta (Coffea canephora) coffee bean extract which has inhibitory effect on the growth of Porphyromonas gingivalis. In this study were divided into 8 treatment groups namely positive control, negative control, 0.5% robusta coffee bean extract, 0.75%, 1%, 1.25%, 1.5% and 3%. Petridish dishes containing TSA media that have been sterilized, added P. gingivalis suspension with density according to Mc standard. Farland Then a sterile white test blank with a diameter of 6 mm that is still sterile is placed on top of the bacterial growth media in accordance with the placement of the treatment group and dropped with all 8 treatment materials. After 24 hours incubated in a desiccator, the inhibition of robusta coffee bean extracts against the growth of Porphyromonas gingivalis bacteria was observed and data collection was done by measuring the inhibition zone using calipers. The results obtained robusta coffee bean extract at concentrations of 3%, 1.5%, 1.25% and 1%, have an antibacterial power which is suspected because Robusta coffee beans naturally contain ingredients such as caffeine, polyphenols and chlorogenic acids which have antibacterial activity while the robusta coffee bean extract with a concentration of 0.5% and 0.75% does not have antibacterial power against Pophyromonas gingivalis. Robusta coffee bean extract with a concentration of 1% is the smallest concentration of Robusta (Coffea canephora) coffee bean extract which can inhibit the growth of Porphyromonas gingivalis.