Guava Extract Research Articles

Efficacy of wound cleanser 25% based on indonesian medicine plants on chronic wound healing


 ABSTRACT
 Background: Chronic wounds are a challenge for wound care professionals and a global economic burden that has increased morbidity and mortality in patients worldwide.
 Purpose: This study aims to determine the efficacy of wound cleanser with guava leaf extract (Psidium guajava Linn) and betel leaf extract (Piper betle L) 25% on the inhibition of bacterial growth in chronic wounds.
 Methods: The research conducted was laboratory experimental in nature. Guava leaf extract (Psidium guajava Linn) and betel leaf extract (Piper betle L) were formulated in the form of liquid soap with a concentration of 25% then evaluation of the physical preparations, allergy tests and bacterial tests were carried out in the form of the inhibition of liquid soap against Pseudomonas aeruginosa bacteria, Staphylococcus aureus, Escherichia coli in chronic wounds, Bacillus subtilis, Bacillus cereus, Staphylococcus epidermidis and Yeast Candida Albicans. Data collection is carried out after passing the ethical test.
 Results: This proves that liquid soap preparations of ethanol extract of guava leaves (Psidium guajava Linn) and betel leaf extract (Piper betle L) have medium, strong and very strong inhibition against Pseudomonas aeruginosa (12.28 mm), Staphylococcus aureus (19.48 mm), Escherichia coli (13.94 mm), Bacillus subtilis (27.58 mm), Bacillus cereus (11.11 mm), Staphylococcus epidermidis (14.44 mm) and category of respond medium inhibition on Yeast Candida Albicans (8.13 mm).
 Conclusion: Based on the results of the study, it can be concluded that the formulation of liquid soap preparations of ethanol extract of guava leaves (Psidium guajava Linn) and betel leaf extract (Piper betle L) with a concentration of 25% fulfills the quality requirements for liquid soap preparations. The results of this liquid soap antibacterial test had a strong response in inhibiting the growth of the bacteria Pseudomonas aeruginosa, Staphylococcus aureus, Escherichia coli, Bacillus cereus, Staphylococcus epidermidis.
 
 Keywords: Liquid soap, Psidium guajava Linn, Piper betle L, Bacteria

Graphene and gold nanoparticle-based bionanocomposite for the voltammetric determination of bisphenol A in (micro)plastics

The monitoring of endocrine disruptors in the environment is one of the main strategies in the investigation of potential risks associated with exposure to these chemicals. Bisphenol A is one of the most prevalent endocrine-disrupting compounds and is prone to leaching out from polycarbonate plastic in both freshwater and marine environments. Additionally, microplastics also can leach out bisphenol A during their fragmentation in the water environment. In the quest for a highly sensitive sensor to determine bisphenol A in different matrices, an innovative bionanocomposite material has been achieved. This material is composed of gold nanoparticles and graphene, and was synthesized using a green approach that utilized guava (Psidium guajava) extract for reduction, stabilization, and dispersion purposes. Transmission electron microscopy images revealed well-spread gold nanoparticles with an average diameter of 31 nm on laminated graphene sheets in the composite material. An electrochemical sensor was developed by depositing the bionanocomposite onto a glassy carbon surface, which displayed remarkable responsiveness towards bisphenol A. Experimental conditions such as the amount of graphene, extract: water ratio of bionanocomposite and pH of the supporting electrolyte were optimized to improve the electrochemical performance. The modified electrode displayed a marked improvement in current responses for the oxidation of bisphenol A as compared to the uncovered glassy carbon electrode. A calibration plot was established for bisphenol A in 0.1 mol L−1 Britton-Robinson buffer (pH 4.0), and the detection limit was determined to equal to 15.0 nmol L−1. Recovery data from 92 to 109% were obtained in (micro)plastics samples using the electrochemical sensor and were compared with UV–vis spectrometry, demonstrating its successful application with accurate responses.

Adsorption of Ibuprofen as a pharmaceutical pollutant from aqueous phase using zinc oxide nanoparticles: Green synthesis, batch adsorption and biological activities.

Recent interest has focused on the biosynthesis of metal nanoparticles, particularly from plants. The production of precipitate served as an early indicator of the presence in the present study's use of ZnO nanoparticles green synthesis of these particles, which was further validated by; Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD). Additionally, the BET was used to calculate the surface area, which came out to be 119.12 m2 /g. Since the true effects of new pollutants, including medicines, on the environment and human health are not well understood, their presence in aquatic systems poses a severe hazard. For this reason, the antibiotic Ibuprofen (IBP) was absorbable to ZnO-NPs in this search. As opposed to fitting to Langmuir isothermally, the adsorption process was discovered to be pseudo-second-order kinetically, and the reaction was determined to be a chemisorption process. The process was endothermic and spontaneous, according to thermodynamic studies. Maximizing IBP removal from aqueous solution required the use of a Box-Behnken surface statistical design with four components, four levels, and response surface modelling. Solution pH, IBP concentration, duration, and dose were the four parameters that were utilized. The regeneration process, which is employed for five cycles with excellent efficiency, is the best benefit of using ZnO-NPs. Examine the elimination of pollutants from actual samples as well. However, the adsorbent is quite effective at reducing biological activity. At high concentrations of ZnO-NPs demonstrated notable antioxidant activity and RBC hemocompatibility and no discernible hemolysis was seen. ZnO-NPs demonstrated a notable percent suppression of α-amylase up to 53.6 % at 400 μg/mL, and so displayed potential as an antidiabetic. Cyclooxygenase was suppressed by ZnO-NPs in an anti-inflammatory test (COX-1 & COX-2) up to 56.32 and 52.04 % at a concentration of 400 μg/mL, respectively. Significant anti-Alzheimer potential was demonstrated by ZnO-NPs at 400 μg/mL by inhibiting Acetyl cholinesterase (AChE) and Butyl cholinesterase (BChE) up to 68.98 ± 1.62% and 62.36% respectively. We came to the conclusion that guava extract is helpful for ZnO-NP reduction and capping. The bioengineered nanoparticles could prevent Alzheimer's, diabetes, and inflammation and were biocompatible. This article is protected by copyright. All rights reserved.

Anticancer and antioxidant activities of ethanolic extract and semi-purified fractions from guava and mango seeds

Mango (Mangifera indica) and guava (Psidium guajava) seeds have several pharmaceutical applications and biological activities because as they have been recognized with different bioactive molecules (phenolic compounds) such as flavonoids, phenolic acids, and catechins, so they have antioxidant and anticancer activities. The aim of the present study was to assess in vitro antioxidant and anticancer activities of successive extracts and semi-purified fractions from mango seeds. In this work, mango and guava seeds were collected and extracted using two solvents (ethanol 70% and ethyl acetate) followed by phytochemical screening and determination of biological activities such as antioxidant activity using five assays (DPPH, ABTS, KMnO4, Methylene blue and H2O2) additionally the antiradical activity and hybrid reaction for ethanolic extract of mango seeds as promising extract. The total phenolic, flavonoid, and catechin compounds were determined for all successive extracts, and finally, the anticancer activity of extracts was evaluated using MTT assay against HepG2 cell line and phenolic compounds were identified by HPLC. The phytochemical screening and TLC showed the primary investigation for phenolic compounds of ethanol extracts of both kind of seeds and only ethyl acetate of guava extract as promising extracts. However, HPLC determination of these three extracts showed high amount of gallic acid, naringenin, ellagic acid, and ferulic acid as they have anticancer and antioxidant activities. The antioxidant tests showed that the ethanolic mango extract is the highest antioxidant extract against DPPH by 84.0%, but recorded 82.0% with methylene blue and ABTS assays when compared with ascorbic acid. The ethyl acetate of guava extract showed strong cytotoxic effect with IC50 75.5 μg/mL against HepG2 cell line in all tested concentrations. From the obtained results, it could be concluded that mango ethanolic extract and its fractions are the most promising as antioxidants and ethyl acetate of guava extract the most promising in the anticancer activity.

Wormlike reverse micelles loaded with aqueous extracts of Psidium guajava leaves: Performance evaluation by rheology and Raman microscopy methods

Phenolic compounds are molecules that provide health benefits. However, they present problems for their use. The use of wormlike reverse micelles to load aqueous extracts of Psidium guajava (guava) was carried out. Different solutions (i.e., content variation of canola oil, oleic acid, soy lecithin; stirring time, stirring speed) were obtained by incorporation of water by ultrasound and centrifugation. The behavior of the wormlike micelles was evaluated with optical microscopy, simple shear tests, and Raman microscopy with and without aqueous extract of guava leaves. The wormlike reverse micelles solution were adjusted to the Carreau-Yasuda model. Influence of the aqueous extracts of guava leaves were observed in the parameters of Carreau-Yasuda model, related with changes in the packing of the hydroxyl groups and high order of packing in wormlike reverse micellar system.

Effect of altitude and solvent on Psidium guajava Linn. leaves extracts: phytochemical analysis, antioxidant, cytotoxicity and antimicrobial activity against food spoilage microbes

BackgroundGuava (Psidium guajava Linn.) has been traditionally used in the treatment of a wide range of diseases due to its rich content of secondary metabolites.AimThis study was aimed to evaluate the effect of altitude and solvent systems on guava leaves crude extract’s phenolics and flavonoid content, antioxidant, antimicrobial, and toxicity nature.MethodsGuava leaves were collected from three different geographical locations in Nepal while solvents with an increasing polarity index were used for extraction. The yield percentage of extracts was calculated. Total Phenolic Content, Total Flavonoid Content, and antioxidant activity were determined by the Folin-Ciocalteu method, Aluminium chloride colorimetric method, and DPPH (2,2′-Diphenyl-1-picrylhydrazyl) assay respectively. The quantification of fisetin and quercetin was performed using the HPLC with method validation. The antimicrobial activity of the extracts was tested against bacteria and fungus isolated from spoiled fruits and vegetables and identified through 16s and 18s rRNA sequencing. Finally, Brine Shrimp Lethality Assay (BSLA) was used for testing the toxicity of the extracts.ResultsThe phenolic and total flavonoid content was found to be higher in ethanol extract (331.84 mg GAE/g dry extract) and methanol extract (95.53 mg QE/g dry extract) from Kuleshwor respectively. Water extract of guava leaves from Kuleshwor (WGK) did not show significantly different antioxidant activity when compared to methanol and ethanol extracts. Fisetin and quercetin were higher in WGK (1.176 mg/100 g) and (10.967 mg/100 g) dry extract weight respectively. Antibacterial activity against food spoilage bacteria was dose-dependent and found to be highest for all the extracts from different solvents and altitudes at higher concentrations (80 mg/ml). Similarly, methanol and ethanol guava extracts from all locations showed antifungal activity against Geotrichum candidum RIBB-SCM43 and Geotrichum candidum RIBB-SCM44. WGK was found to be non-toxic.ConclusionOur study concludes that the antioxidant and antimicrobial activity of WGK was found to be similar statistically to that of methanol and ethanol extracts of Bishnupur Katti and Mahajidiya. These results suggest the possibility of using water as a sustainable solvent to extract natural antioxidant and antimicrobial compounds which can further be used as natural preservatives to extend the shelf life of fruits and vegetables.

Kultur In Vitro Pisang Cavendish (Musa acuminata L.) Pada Media Dengan Konsentrasi Berbeda Ekstrak Jambu Batu Dan Benzyl Amino Purine

In vitro culture requires suitable media, the addition of BAP as a cytokinin is considered to accelerate the growth of Cavendish bananas. Constraints of browning in explants are also often found in the growth of banana explants. The addition of guava extract as an organic antioxidant and BAP is expected to suppress browning and improve the growth of Cavendish banana explants in vitro. The study was aimed to obtain the best concentration of guava extract (Psidium guajava) and Benzyl Amino Purine for the growth of Cavendish banana (Musa acuminata) explants in vitro. This study used a completely randomized design (CRD) with a factorial pattern of 4 x 3 with 4 replications. Treatment of guava extract added to the media (0 g/l, 1 g/l, 2 g/l, 3 g/l) and BAP (3 ppm, 6 ppm, 9 ppm). The data were analyzed using variance with the F test and continued with Duncan's Multiple Distance Test with 5% significance level. The results showed that the best result for the number of shoots were in the treatment of 1 g/l guava extract + BAP 3 ppm. In the number of leaves and high shoots the best result were in the treatment of 0 g/l guava extract + BAP 6 ppm

Fishing the Targets of Bioactive Compounds from Psidium guajava L. Leaves in the Context of Diabetes.

Psidium guajava L. (guava) leaves have demonstrated their in vitro and in vivo effect against diabetes mellitus (DM). However, there is a lack of literature concerning the effect of the individual phenolic compounds present in the leaves in DM disease. The aim of the present work was to identify the individual compounds in Spanish guava leaves and their potential contribution to the observed anti-diabetic effect. Seventy-three phenolic compounds were identified from an 80% ethanol extract of guava leaves by high performance liquid chromatography coupled to electrospray ionization and quadrupole time-of-flight mass spectrometry. The potential anti-diabetic activity of each compound was evaluated with the DIA-DB web server that uses a docking and molecular shape similarity approach. The DIA-DB web server revealed that aldose reductase was the target protein with heterogeneous affinity for compounds naringenin, avicularin, guaijaverin, quercetin, ellagic acid, morin, catechin and guavinoside C. Naringenin exhibited the highest number of interactions with target proteins dipeptidyl peptidase-4, hydroxysteroid 11-beta dehydrogenase 1, aldose reductase and peroxisome proliferator-activated receptor. Compounds catechin, quercetin and naringenin displayed similarities with the known antidiabetic drug tolrestat. In conclusion, the computational workflow showed that guava leaves contain several compounds acting in the DM mechanism by interacting with specific DM protein targets.

Stimulating Antimicrobial Activity in Aspirin with Psidium guajava and Syzygium aromaticum Extracts against Multi-drug Resistant Salmonella Spp: A Comparative Study of Multiple Combinations

Factros such as gene mutation and transfer, some inappropriate uses and diagnostics, and the prescription of antibiotics to undiagnosed patients has significantly led to the emergence of drug resistance in bacteria, which is also hampering our ability to treat infections. As the declines of new antibiotics, scientists and researchers keep trying to develop or propose some synergistic combinations of antibiotics with medicinal plants extracts in an effort to boost their antimicrobial activities against drug resistant bacteria. This work aimed to develop a cocktail regimen, which will be highly susceptible to confirmed drug resistant clinical isolate of Salmonella spp, using Tetracycline, Co-trimoxazole, Aspirin, Psidium guajava and Syzygium aromaticum extract alongside minimizing toxicity potential. Twenty-four (24) different combinations were made from 10 µg/mL of Co-trimoxazole, Tetracycline and Aspirin with each clove extract and separately again with guava extract. Eighteen (18) of them were combined in three different stages (6 each) using concentrated Tetraoxosulphate (vi) acid (H2SO4) and 0.1 Molar sodium hydroxide (NaOH), while 31 antimicrobial disks were prepared and tested on Salmonella spp. The antimicrobial susceptibility test revealed that Scl, a stage 1 combination of Co-trimoxaazole with clove extract; Ac2, a stage 2 combination of Aspirin and clove extract; Ag2, a stage 2 combination of Aspirin and guava leave extract were all susceptible to the confirmed resistant isolate of Salmonella spp. Ag2 had the best zone of inhibition better than Ciprofloxacin inhibition zone at 20 µg/mL. Aspirin was the best precursor drug which favourably combines with both clove and guava extract to give a desired cocktail regimen with potential antimicrobial characteristics. Hence, it is needed to identify the compounds obtained in this combinations, isolates, and purify their active principles, and subjected to other pharmacological test to ascertain if they can be used to combat multi-drug resistant bacteria and other pathogenic organisms.

Silk nanoparticles for the protection and delivery of guava leaf (Psidium guajava L.) extract for cosmetic industry, a new approach for an old herb

Guava (Psidium guajava L.) is a well-known plant containing high levels of natural antioxidants, the phenolic compounds, which have been employed in numerous cosmetic products. However, these molecules are unstable to oxidants, light, temperature, pH, water, and enzymatic activities. Therefore, to enhance their stability and preserve their antioxidant activity, this study investigated the silk fibroin nanoparticles (SFNs) ability to encapsulate, deliver, and heat-protect the phenolic compounds of the guava leaves ethanolic extract. Firstly, the guava ethanolic extract was produced by maceration, which possessed a total phenolic content of 312.6 mg GAE/g DPW and a high antioxidant activity (IC50 = 5.397 ± 0.618 µg/mL). Then, the extract loaded SFNs were manufactured by desolvation method, and the particles demonstrated appropriate sizes of 200–700 nm with narrow size distribution, spherical shape, silk-II crystalline structure, high drug entrapment efficiency of > 70% (dependent on the fibroin content), and a two-phase sustained drug release for at least 210 min. Using the 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay, the antioxidant activity of the guava extract was well-preserved in the extract loaded SFNs. Finally, after being treated with high temperature of 70 °C for 24 h, the guava extract almost loses all of its antioxidant property (5 times decrement), whereas the extract loaded SFNs could retain the extract activity. Conclusively, the SFNs proved much potential to deliver and heat-protect the guava extract phenolic compounds, and preserve their antioxidant activity. Confirmed by this case, SFNs could be further explored in protecting other natural compounds from environmental factors.

Determinación de la actividad ansiolítica del extracto hidroalcohólico de las hojas de guayaba (Psidium guajava)

El objetivo fue determinar la actividad ansiolítica del extracto hidroalcohólico de las hojas de guayaba (Psidium guajava) en ratones (Mus musculus). La materia vegetal fue recolectada, secada, triturada y macerada con etanol al 70% durante tres días para su concentración. Se realizó el control de calidad de la droga seca y del extracto concentrado, para posteriormente ejecutar el tamizaje fitoquímico e identificar los metabolitos secundarios presentes en la planta. A continuación, el extracto se concentró hasta dejarlo seco y libre de alcohol. Para evaluar la actividad ansiolítica, se utilizaron 30 ratones machos con un peso de 25 - 30 g y una edad de 2 - 3 meses. Se utilizó propilenglicol al 15% como control negativo, Clonazepam como control positivo y los extractos a concentraciones de 25, 100, 200 y 300 mg/Kg. Se realizaron pruebas no condicionadas, con los equipos de: Cuarto Claro-Oscuro, Laberinto en Cruz Elevado y Campo Abierto. El comportamiento de los ratones en los distintos equipos fue grabado para posteriormente procesarlos en los programas ITOPI (Cuarto Claro-Oscuro y Laberinto en Cruz Elevado) y EMIS (Campo Abierto). Los datos fueron analizados en el programa IBM® SPSS® statistics versión 22, determinando que las dosis de 200 y 300 mg/Kg presentan mayor actividad ansiolítica sin afectar la locomoción de los biomodelos.

Guava (Psidium guajava L.) Leaf Extract as Bioactive Substances for Anti-Androgen and Antioxidant Activities.

Leaves of guava (Psidium guajava L.) have been used in Thai folk medicine without any supporting evidence as a traditional herbal remedy for hair loss. Androgenetic alopecia (AGA) is chronic hair loss caused by effects of androgens in those with a genetic predisposition, resulting in hair follicle miniaturization. Our objectives were to provide the mechanistic assessment of guava leaf extract on gene expressions related to the androgen pathway in well-known in vitro models, hair follicle dermal papilla cells (HFDPC), and human prostate cancer cells (DU-145), and to determine its bioactive constituents and antioxidant activities. LC-MS analysis demonstrated that the main components of the ethanolic extract of guava leaves are phenolic substances, specifically catechin, gallic acid, and quercetin, which contribute to its scavenging and metal chelating abilities. The guava leaf extract substantially downregulated SRD5A1, SRD5A2, and SRD5A3 genes in the DU-145 model, suggesting that the extract could minimize hair loss by inhibiting the synthesis of a potent androgen (dihydrotestosterone). SRD5A suppression by gallic acid and quercetin was verified. Our study reveals new perspectives on guava leaf extract's anti-androgen properties. This extract could be developed as alternative products or therapeutic adjuvants for the treatment of AGA and other androgen-related disorders.

Antibacterial Potential of Methanol Extract of Red Guava Leaves (Psidium guajava L.) Against Salmonella typhi

Background: Typhoid fever is a fever caused by an infection of the gastrointestinal tract, where the infection is caused by the bacterium Salmonella typhi. This infection is generally found in environmental conditions with dense populations and poor hygiene levels. Various plants have been used from generation to generation to treat typhoid fever, one of which is red guava leaves. This study aims to further explore the potential of methanol extract of red guava leaves (Psidium guajava L.) on the activity of Salmonella thyphi in vitro.
 Methods: This study is an in vitro experimental study using Salmonella thyphi culture. The phytochemical screening test was carried out on the methanol extract of red guava leaves. Furthermore, an assessment of the diameter of the inhibition zone between groups was carried out. Univariate and bivariate analyzes were performed to compare between groups.
 Results: There was an increase in the diameter of the inhibition zone along with an increase in the dose of methanol extract from red guava leaves. A dose of 100 mg/mL of red guava leaf extract showed a maximum inhibition diameter of 11.85 cm.
 Conclusion: Methanol extract of red guava leaves (Psidium guajava L.) has the antibacterial activity of Salmonella thyphi along with increasing concentrations.

Formulation and evaluation of guava leaf extract gel for mouth ulcer management

The highlight of this study was preparation of microparticles using the extract of guava leaves which led to novel drug delivery of the herbal extract. The aim of the study was to formulate a microparticles loaded gel for management of mouth ulcer. The microparticles were prepared by solvent evaporation method using the polymer, oil and liquid phase. Then the preparation of gel base was done with incorporation of microparticles. The evaluation of the microparticles and the gel was done. This study is an effort to develop a herbal gel for mouth ulcers offering better compatibility and lesser discomfort. We used Psidium guajava leaf extract microparticles for the preparation of gel. The gel formulations prepared were transparent and homogeneous within the pH range of 6 to 6.8. The formulation showed acceptable spreadability, extrudability and rheological properties. The formulation showed antibacterial effect against Staphylococcus aureus and E coli. Therefore, developed formulations have the potential to treat mouth ulcers. The Psidium gujava leaf extract microparticles loaded gel is a good mucoadhesive gel for mouth ulcer management. Therefore, herbal ingredients can be used for novel drug delivery and make it safe for administration with lesser risk of adverse reactions.

Apoptosis of Human Breast Cancer Cells (MCF-7) Induced by Psidium guajava Simplisia Extract

Cancer is one of the leading causes of death in the world. In 2014, the death rate caused by this cancer reached 585,720 cases. The most common cancers suffered by women include breast cancer (29%), lung cancer (13%), colon cancer (8%), uterine cancer (6%), and thyroid cancer (6%) (Siegel et al. 2014). Therefore, many studies have been conducted to find the best treatment for fighting this cancer. Breast cancer is caused by abnormal cells in the breast that occur continuously. Breast cancer can be affected by several mechanisms, such as angiogenesis (Schneider & Miller 2005), metastasis (Weigelt et al. 2005), and apoptosis (Yang et al. 2006). Apoptosis is a normal cell death process that occurs after several times of replication. This process of apoptosis has a critical role in normal cells and cancer cells. Cell death due to apoptosis is regulated by an interplay between pro-apoptotic and anti-apoptotic proteins. These proteins are the result of gene expression, for example, the Bax gene that expresses the Bax protein and the Bcl-2 gene that expresses the Bcl-2 protein (Martin & Dowsett 2013).Various kinds of treatments have been developed to inhibit the growth of cancer cells, such as radiation therapy, chemotherapy, hormone therapy, and surgery. However, this treatment only works in the early stages of cancer, and later, cells become resistant to these various treatments. In addition, multiple medications can also kill other normal cells. Therefore, research on the treatment of cancer has been developed using bioactive compounds found in natural ingredients, such as fruits (Abrahim et al. 2012). One of the plants that have been widely developed for cancer treatment is guava (Psidium guajava). This plant has been known to have many purposes, such as antibacterial, antidiarrheal, anti-acne, and anti-inflammatory (Ryu et al. 2012). This study aims to examine the effect of guava extract on the induction of apoptosis in MCF-7 breast cancer cells (ATCC HTB 22), which can later be used as candidates for anticancer drugs.

Effects of Psidium guajava L. leaves extract on blood pressure control and IL-10 production in salt-dependent hypertensive rats

Psidium guajava (guava) leaves extract displays anti-hypertensive properties by mechanisms not yet fully understood. Here, we investigated whether sympathetic drive and immune signaling mechanisms are involved with the antihypertensive effect of the guava extract in a model of salt-dependent hypertension. Raw guava extract (rPsE) was characterized by colorimetric and UPLC-MS techniques. Two doses of rPsE (100 and 200 mg/kg) were evaluated for anti-hypertensive effect using a suspension system (PsE). Weaned male Wistar rats were put on a high-salt diet (HSD, 0.90 % Na+) for 16 weeks and received gavages of PsE for the last 4 weeks. Blood pressure (BP) was measured at the end of treatment in conscious rats. The neurogenic pressor effect was assessed by ganglionic blockade with hexamethonium. Autonomic modulation of heart rate was evaluated by spectral analysis. The effects of orally administered PsE on lumbar sympathetic nerve activity (LSNA) were assessed in anesthetized rats. Blood IL-10, IL-17A, and TNF were measured. The increased neurogenic pressor effect of HSD rats was reduced by PsE 100 mg/kg, but not by 200 mg/kg. PsE (200 mg/kg) administration in anesthetized rats produced a greater fall in BP of HSD rats compared to standard salt diet (SSD) rats. PsE hypotensive response elicited an unproportionable increase in LSNA of HSD rats compared to SSD rats. PsE (200 mg/kg) increased plasma concentrations of IL-10 but had no effect on TNF or IL-17A. Our data indicate that the antihypertensive effects of PsE may involve autonomic mechanisms and immunomodulation by overexpression of IL-10 in salt-dependent hypertensive rats.

Ultra-fast sustainable synthesis, optimization and characterization of guava phenolic extract functionalized nanosilver with enhanced biomimetic attributes

There had been some reports demonstrating the green synthesis of silver nanoparticles using guava ( Psidium guajava (L.) extract); however, detailed and in-depth interrogation of the vital synthesis parameters for rapid, facile, efficacious synthesis at room temperature, and robust characterization of the as-prepared nanoparticle is currently lacking. This study presents a comprehensive delineation of the sustainable phyto-fabrication of biogenic guava phenolic extract functionalized silver nanoparticles (GVE-SNP) based on guava phenolic extract as the sole reductant/stabilizer, as well as the synthesis optimization, thorough physicochemical characterization and potential biological applications of the as-prepared nanosilver. The results revealed that successful synthesis of GVE-SNP was instantaneous and maximum intensity of the plasmonic peak at 425 nm was achieved in less than 10 min. GVE-SNP was found to present stable, well-dispersed, round, uniform, and crystalline nanoparticles of about 5.88 nm. The FTIR and RAMAN spectra indicated that GVE-SNP surface was properly capped by bioactives from GVE. The nanoparticles displayed potent radical scavenging activity against ABTS + and DPPH . Also, GVE-SNP exhibited a significant and dose–response inhibitory effect against tyrosinase. Furthermore, the nanoparticles displayed good cytotoxicity against L929 fibroblast and were found to possess strong antimicrobial properties, inhibiting the growth of S. aureus and S. epidermidis .

Effect of Leaf Guava Extract on Blood Pressure in Rattus Norwegicus Wistar Strain

Guava leaf extract (Psidium guajava) is a component of traditional medicine containing flavonoids, tannins, triterpenoids, and carotenoids. The study aimed to determined effect of guava leaf extract on blood pressure status of white wistar rats were given an atherogenic diet. The study method was a study experimental with design completely randomized (CRD). The group intervention was given guava leaf extract to white rats which consisted of 3 treatment levels with 5 replications namely control (P0), atherogenic diet (P1), and atherogenic diet with guava leaf extract (P2). The research phase includes the acclimatization stage for 3 days, the atherogenic diet for 2 weeks, and the intervention stage for giving guava leaf extract for 4 weeks. Data analysis used the Shapiro Walk, Kruskall-Wallis test as an alternative of One Way Anova and the Wilcoxon test as an alternative of sample t-test with a value of = 0,01. The results showed that giving an atherogenic diet affected increasing blood pressure. There was a change in blood pressure after the intervention, P0 pre-test 80,40±3,65 mmHg and post-test 83,40±2,30 mmHg (p-value= 0,197), P1 pre-test 82,80±2,59 mmHg and post-test 188,60±2,19 mmHg, (p-value = 0,042), P2 pre-test 82,80±2,17 mmHg and post-test = 108,00±2,74 mmHg (p-value = 0,042). In conclusion, giving an atherogenic diet has an effect on increasing blood pressure and giving guava leaf extract can reduce blood pressure in white wistar rats.

Synthesis of Silver Nanoparticles Using the Combined Extract of Guava (Psidium guajava) and Banyan (Ficus benghalensis) Leaves and Application in the Preparation of Nanobased Mouthwash

Abstract: In this study the combined plant leaf extract of P.guajava and F.benghalensis were used for the production of silver nanoparticles and the green synthesized silver nanoparticles were used to prepare the nanobased mouthwash and its antimicrobial activity was evaluated against the oral infection causing microorganisms . The UV-Visible spectra of the synthesized nanoparticles were demonstrated the C-H bond of the plant extracts. The FTIR results explained the presence of biomolecules and the intense peaks value demonstrated the linkages of biomolecules in the synthesized nanoparticles.

CHARACTERIZATION OF NANO PARTICLES ETHANOL EXTRACT OF GUAVA (PSIDIUM GUAJAVA) FRUIT WITH VARIATION OF CHITOSAN-ALGINATE

The ethanol extract of Guava (Psidium Guajava) fruit is known to have strong antioxidant activity so that it has the potential to be developed into a nanoparticle delivery system. The purpose of this study was to determine the effect of variations in the concentration of chitosan - alginate polymer on the physical characteristics of guava fruit extract nanoparticles (Psidium Guajava). Guava Fruit Extract was formulated in the form of nanoparticles by ionic gelation method with variations in the concentration of chitosan:alginate polymer, namely 0.5% : 0.5% (F1), 0.75% : 0.5% (F2), and 1% : 0.5% (F3). The test parameters include the percentage of transmittance. The optimal formulation is based on the level of clarity of the solution and the percentage of transmittance obtained in the formulation ratio of 0.75%: 0.5% (F2), with an average transmittance of 91.9%. Based on the results of the research that has been done, it can be concluded that guava fruit extract can be formulated in nanoparticle size with varying physical characteristics depending on the concentration of chitosan and alginate used.