Bioactive Compounds from Mangosteen Fruit Peels (Garcinia mangostana L.) and Assessment of their Antioxidant Potential

The aim of this study was to quantify the bioactive compounds in mangosteen fruit peels and assess their antioxidant activity. Peels from washed mature fruits of Garcinia mangostana (L.) were dried, crushed, and sieved, and the bioactive compounds were extracted using distilled water and ethanol 70%, and quantified. The antioxidant potential of the different extracts was assessed through their DPPH scavenging activity, iron reducing power, and total antioxidant capacity. Results showed that ethanol at 70% extracted more bioactive compounds compared to water. Total polyphenols content of 57.19 mg GAE/g DM, flavonoids of 35.06 mg QE/g DM, alkaloids of 4.49 mg QuiE/g DM, and vitamin C of 1.42 mg/100g DM were obtained from hydroethanolic (ethanol 70%) extract. As expected, the highest percentage of scavenging DPPH radical (85.98%) was recorded with hydroethanolic extract compared to the aqueous one (44.66%). Similar behaviors were noticed with the hydroethanolic extract regarding the iron-reducing capacity and the total antioxidant capacity. Thus, justifying the positive correlations obtained between bioactive compounds and antioxidant activities although significant (p<0.05) between alkaloids and DPPH scavenging activity. Mangosteen peels is a good source of bioactive compounds that might be potentially used for food preservation and the management/prevention of cardio-metabolic diseases.

Larvicidal activity of the pericarp extract of Garcinia mangostana against dengue vector Aedes aegypti in Sri Lanka

To assess the larvicidal activity of mangosteen (Garcinia mangostana) against larval stages of Aedes aegypti mosquitoes. Methods: A crude extract was prepared in ethanol from powdered mangosteen pericarps. A concentration gradient (0.01-4.92 g/ L) was prepared from the stock solution. Seven batches of 25 third instar larvae of Aedes aegypti were used for larval bioassays. Larval mortality rates were observed after one and 24 hours. Cholesterol and total lipid contents in 20 randomly selected dead larvae at each trial were assessed by colorimetric method. The experimental setup was repeated five times. The General Linear Model and Probit analysis were used to evaluate the relationship of mortality with cholesterol level, total lipid level and cholesterol to total lipid ratio. Results: The percentage mortalities significantly varied with different concentrations (F7,32=385.737; P<0.001). The LC50 and LC99 values were (0.041 0.006) g/L and (10.616 1.758) g/ L, respectively after 24 hours. There was no mortality recorded within the one-hour exposure time. Only the cholesterol content (F5,24=173.245; P<0.001) in larvae exposed to different concentrations denoted a significantly decreasing trend within 24- hour exposure. Larvae that were exposed to the lowest concentration (0.55 g/L) showed a higher cholesterol level (22.67 1.33) g. Conclusions: The Garcinia mangostana extract acts as an effective sterol carrier protein inhibitor that inhibits cholesterol uptake in Aedes aegypti mosquitoes. Hence, it could be explored for use as a key source for the development of an environment-friendly plantbased larvicide.

A randomized, comparative study on the efficacy and safety of mangosteen 1% extract gel versus benzoyl peroxide 5% gel in the treatment of mild to moderate acne vulgaris

Introduction@#Acne vulgaris is a common dermatologic disorder caused by follicular epidermal hyperproliferation, excess se- bum production, inflammation, and Cutibacterium acnes (C. acnes). The mangosteen fruit rind contains large amount of xantho- nes, which has high antimicrobial activity against C. acnes.@*Objectives@#To compare the efficacy and safety of mangosteen 1% extract gel versus benzoyl peroxide (BPO) 5% gel in the treat- ment of mild to moderate acne vulgaris.@*Methods@#A total of 60 participants with mild to moderate acne or a rating of 2 or 3 in the Investigator’s Global Assessment (IGA) for acne were randomized to receive either mangosteen 1% extract gel or BPO 5% gel applied on the face twice daily over an 8-week period. Primary outcomes measured in the study were clinical remission graded as “clear” or “almost clear” (rating of 0 or 1) based on the IGA and any adverse reaction.

The application of FTIR spectroscopy and chemometrics for classification of Mangosteen extract and its correlation with alpha-mangostin

Alpha-mangostin is the major component in Mangosteen (Garcinia mangostana Linn) pericarp having severalpharmacological activities including reducing blood pressure, antidiabetic, anticancer, and antioxidants. The objectiveof this study was to develop Fourier transform infrared spectroscopy-multivariate calibration of partial least square(PLS) for quantitative analysis of alpha-mangostin and to classify mangosteen pericarp using principal componentanalysis. Mangosteen pericarps from different locations (Java provinces and South Sulawesi, Republic of Indonesia)were extracted using ethanol and were subjected to high performance liquid chromatography (HPLC) for the analysisof alpha-mangostin and Fourier transform infrared (FTIR) spectroscopy measurements. HPLC was used to determinethe levels of alpha-mangostin and used as actual values during FTIR spectroscopy analysis. The prediction of alphamangostin was obtained from the correlation between actual values and FTIR predicted values and facilitated withthe PLS model. The results showed that the wavenumbers region of 3,825–937 cm−1 offered a reliable model with acoefficient correlation (r) value of 0.9927 and root mean square error of calibration of 0.0831%. The validation modelsalso exhibited the accurate and precise results for the prediction of alpha-mangostin with an r-value of 0.9754 androot mean square error of prediction value of 0.174%. Furthermore, the chemometrics of principal component analysisusing variables of absorbances at selected fingerprint (1,000–800 cm−1) could classify mangosteen pericarp fromdifferent regions. FTIR spectroscopy combined with chemometrics offered a reliable method for quality assurance ofmangosteen pericarp

Water extract of mangosteen suppresses H2O2-induced endothelial apoptosis by inhibiting oxidative stress

Excessive production of reactive oxygen species (ROS) is a major cause of endothelial apoptosis. Mangosteenextract has been shown to possess antioxidant properties. Mangosteen is commonly extracted either with semi-polarsolvent, yielding virtually pure α-mangostin, or with water, yielding a low α-mangostin concentration but includinga wide variety of other polyphenols present in the fruit. However, the effect of a water extract of mangosteen(ME) on ROS induced cell death is not yet known. This study evaluated whether ME suppresses H2O2-inducedendothelial cell death and ROS production in human endothelial cell lines. The concentrations of ME and H2O2were determined by 3-(4,5-Dimethylthiazol-2-yl)-2,5-Diphenyltetrazolium Bromide (MTT) assay. IntracellularROS levels were determined by 2', 7' dichlorodihydrofluorescein diacetate assay, and cell death rates by MTT andTerminal deoxynucleotidyl transferase dUTP Nick-End Labeling assays. mitogen-activated protein kinase (MAPK)and apoptotic proteins were analyzed by western blot. Results showed that ME concentrations of 1, 5, and 10 µg/mlwere non-toxic. ME significantly attenuated ROS formation and cell death, both in a dose-dependent manner. MEalso reduced phosphorylation of p38 MAPK as well as cleavage of caspase 3 and poly(ADP-ribose) polymerase-1.In summary, ME demonstrates anti-apoptotic effects against H2O2-induced endothelial cell death by inhibiting ROSformation and suppressing p38 MAPK.

Chemical composition and antioxidant studies of underutilized part of mangosteen (Garcinia mangostana L.) fruit

Mangosteen (Garcinia mangostana L) is one of Indonesian fruit with export commodity due to its sweet-sour andpleasant taste. The pulp of this fruit is frequently consumed freshly, while the seed and peel are removed and become awaste. The chemical components contained in mangosteen’s seed and peel, especially xanthones, have been reported asantioxidants either in vitro or in vivo. Several traditional medicine products used the extracts of mangosteen as one ofits components; therefore, the characterization of mangosteen extracts through identification of its active componentsis very important. This review article highlighted the updates on the characterization and antioxidant activities ofmangosteen’s seed and peel to prove that the wastes of mangosteen fruit could be advantageous to be developed asfunctional food as antioxidants. Several databases have been used during performing this review, including PubMed,Scopus, Biological abstracts, chemical abstracts, and Google Scholar.

Development and validation of a high-performance thin layer chromatography method for the simultaneous quantitation of α- and γ-mangostins in Thai stingless bee propolis

ABSTRACT Stingless bees (Apoidea) are widely distributed and commercially cultivated in artificial hives in fruit gardens. Their propolis are commonly used in traditional medicine to treat various diseases (e.g., abscesses, inflammations, and toothaches) and as a constituent of numerous health products. Thus, this study aimed to (i) develop and validate a high-performance thin layer chromatography method for the quantitation of major active constituents (α- and γ-mangostins) in propolis produced by five stingless bee species (Tetragonula fuscobalteata Cameron, T. laeviceps Smith, T. pagdeni Schwarz, Lepidotrigona terminata Smith, and L. ventralis Smith) cultivated in Thai mangosteen orchards and (ii) determine an optimal extraction solvent. Separation was performed on a silica gel 60 F254 plate using toluene/ethyl acetate/formic acid (8:2:0.1, v/v/v) as a mobile phase, and the developed method was validated to assure its linearity, precision, accuracy, and limits of detection/quantitation. Propolis extract from T. fuscobalteata exhibited the highest mangostin content, and acetone was shown to be more a more effective extraction solvent than dichloromethane, ethanol, or methanol. Thus, the simplicity and reliability of the developed method make it well suited for the routine analysis (e.g., for quality control) of commercial products containing stingless bee propolis.

The microencapsulation of mangosteen peel extract with maltodextrin from arenga starch: formulation and characterization

The antioxidant compounds in mangosteen peel extract have characteristics, namely, unstable, reactive, and veryeasily oxidized. To protect the damage of bioactive compounds, xanthone, it needs a coating method with materialswhose effectiveness and efficiency have been proven such as maltodextrin. This study aims to examine the optimalformulations and characteristics produced from microencapsulation of mangosteen peel extract with maltodextrinfrom arenga starch. The mangosteen peel was extracted with 96% ethanol and maltodextrin was made in microparticlesize. Then, it was formulated in various balances of mangosteen peel extract with maltodextrin, respectively, asfollows: 70:30, 60:40, 50:50, 40:60, and 30:70 (%). Each formulation was homogenized for 15 minutes and hydratedfor 18 hours at 4°C. After that, the sample was homogenized for 1 minute and sprayed using a spray dryer at a feed rateof 15 ml per minute with an inlet temperature of 170°C and a pressure of 1 atm. Furthermore, the microencapsulationproducts were carried out by characterization, including particle size, zeta potential, morphology, encapsulationefficiency, and stability of microcapsules. The data were analyzed using analysis of variance. If there were significantdifferences, it would be tested using Duncan’s Multiple Range Test method. The results showed that the formulationof the ratio of mangosteen peel extract with maltodextrin had a significant effect (p < 0.05) on particle size, zetapotential, morphology, encapsulation efficiency, and stability of microcapsules. The characterization results from eachformulation reported that the ratio of mangosteen peel extract and maltodextrin at level 50%:50% (MP3) producedmore proportional characteristics than other treatments. The formulation of mangosteen peel extract with maltodextrinat a balanced ratio could be used as an alternative supply and processing of functional food.

The microencapsulation of mangosteen peel extract with maltodextrin from arenga starch: formulation and characterization

The antioxidant compounds in mangosteen peel extract have characteristics, namely, unstable, reactive, and veryeasily oxidized. To protect the damage of bioactive compounds, xanthone, it needs a coating method with materialswhose effectiveness and efficiency have been proven such as maltodextrin. This study aims to examine the optimalformulations and characteristics produced from microencapsulation of mangosteen peel extract with maltodextrinfrom arenga starch. The mangosteen peel was extracted with 96% ethanol and maltodextrin was made in microparticlesize. Then, it was formulated in various balances of mangosteen peel extract with maltodextrin, respectively, asfollows: 70:30, 60:40, 50:50, 40:60, and 30:70 (%). Each formulation was homogenized for 15 minutes and hydratedfor 18 hours at 4°C. After that, the sample was homogenized for 1 minute and sprayed using a spray dryer at a feed rateof 15 ml per minute with an inlet temperature of 170°C and a pressure of 1 atm. Furthermore, the microencapsulationproducts were carried out by characterization, including particle size, zeta potential, morphology, encapsulationefficiency, and stability of microcapsules. The data were analyzed using analysis of variance. If there were significantdifferences, it would be tested using Duncan’s Multiple Range Test method. The results showed that the formulationof the ratio of mangosteen peel extract with maltodextrin had a significant effect (p < 0.05) on particle size, zetapotential, morphology, encapsulation efficiency, and stability of microcapsules. The characterization results from eachformulation reported that the ratio of mangosteen peel extract and maltodextrin at level 50%:50% (MP3) producedmore proportional characteristics than other treatments. The formulation of mangosteen peel extract with maltodextrinat a balanced ratio could be used as an alternative supply and processing of functional food.

Effect of Garcinia mangostana L. and propolis extracts on the inhibition of inflammation and alveolar bone loss in ligature-induced periodontitis in rats

The purpose of this study was to evaluate the effect of mangosteen extract complex (MEC; Garcinia mangostana L. and propolis extracts) on the inhibition of inflammation and prevention of alveolar bone loss using a ligature-induced periodontitis model. Rat molars were ligatured with silk, and 1 µg/mL of lipopolysaccharide of Porphyromonas gingivalis was injected into the buccal and palatal gingivae of the teeth with or without treatment with the MEC. Changes in the expression levels of prostaglandin E₂ (PGE₂), interleukin-8 (IL-8), inducible nitric oxide synthase (iNOS), matrix metalloproteinase-8 (MMP-8), cyclooxygenase (COX)-1, and COX-2 in gingival tissues were evaluated using enzyme-linked immunosorbent assays. Alveolar bone loss around the ligated molars was examined using micro-computed tomography. The expression levels of PGE₂, IL-8, iNOS, MMP-8, COX-1, and COX-2 in gingival tissues were significantly reduced in the group treated with a mixture of 16 µg of mangosteen extract powder and 544 µg of propolis extract powder (ligation [Lig] + lipopolysaccharide extracted from P. gingivalis KCOM 2804 [L] + MEC 1:34). Additionally, alveolar bone loss was significantly reduced in the Lig + L + MEC 1:34 group compared with that in other groups. These results indicate that the MEC could be useful in preventing and treating periodontitis.

Protocol and Rationale: A 24-week Double-blind, Randomized, Placebo Controlled Trial of the Efficacy of Adjunctive Garcinia mangostana Linn. (Mangosteen) Pericarp for Schizophrenia

OBJECTIVE: Garcinia mangostana Linn., commonly known as mangosteen, is a tropical fruit with a thick pericarp rind containing bioactive compounds that may be beneficial as an adjunctive treatment for schizophrenia. The biological underpinnings of schizophrenia are believed to involve altered neurotransmission, inflammation, redox systems, mitochondrial dysfunction, and neurogenesis. Mangosteen pericarp contains xanthones which may target these biological pathways and improve symptoms; this is supported by preclinical evidence. Here we outline the protocol for a double-blind randomized placebo-controlled trial evaluating the efficacy of adjunctive mangosteen pericarp (1,000 mg/day), compared to placebo, in the treatment of schizophrenia. METHODS: We aim to recruit 150 participants across two sites (Geelong and Brisbane). Participants diagnosed with schizophrenia or schizoaffective disorder will be randomized to receive 24 weeks of either adjunctive 1,000 mg/day of mangosteen pericarp or matched placebo, in addition to their usual treatment. The primary outcome measure is mean change in the Positive and Negative Symptom Scale (total score) over the 24 weeks. Secondary outcomes include positive and negative symptoms, general psychopathology, clinical global severity and improvement, depressive symptoms, life satisfaction, functioning, participants reported overall improvement, substance use, cognition, safety and biological data. A 4-week post treatment interview at week 28 will explore post-discontinuations effects. RESULTS: Ethical and governance approvals were gained and the trial commenced. CONCLUSION: A positive finding in this study has the potential to provide a new adjunctive treatment option for people with schizophrenia and schizoaffective disorder. It may also lead to a greater understanding of the pathophysiology of the disorder.

Effect of mangosteen peel extract as an antioxidant agent on the shear bond strength of orthodontic brackets bonded to bleached teeth

Abstract Introduction: The number of patients who seek orthodontic treatment that may have a history of tooth bleaching is increasing over the time. Bleaching may influence the decrease of the bond strength of orthodontic brackets. Objective: To determine and prove the effect of mangosteen peel (MP) extract to reverse the reduced shear bond strength (SBS) of orthodontic brackets after bleaching. Methods: A total of 150 maxillary first premolar teeth were randomly divided into 6 experimental groups as follow (n=25): negative-control (N: no bleaching), positive-control (P: bleaching + no treatment), and the treatment groups (bleaching + 10% sodium ascorbate (SA), 10% (MP-10), 20% (MP-20) and 40% (MP-40) MP extract gel). After treatment, the brackets were bonded with the resin-modified glass ionomer cement, SBS testing was performed using universal testing machine, and the adhesive remnant index (ARI) was examined using stereoscopic microscope after debonding. The SBS data were analyzed by analysis of variance (Anova) and the Tukey test. For the ARI, the Kruskal-Wallis test was performed. Result: There was significant SBS difference (p< 0.001) between various groups. The group without bleaching showed significantly higher SBS (8.19 ± 2.26 MPa) compared to others, while SBS in the group treated with 40% MP gel was significantly higher (7.93 ± 1.92 MPa) than other groups treated with antioxidants. The failure of orthodontic brackets bonded after bleaching and treatment using MP extract occurred at the enamel-adhesive interface. Conclusion: The application of MP extract as an antioxidant after bleaching was effective in reversing the reduced shear bond strength of orthodontic brackets after bleaching.

Resumo Introdução: o número de pacientes que procuram o tratamento ortodôntico e têm histórico de clareamento dentário tem aumentado. O clareamento pode levar à diminuição da resistência adesiva dos braquetes ortodônticos. Objetivos: comprovar a efetividade do extrato de casca de mangostão (CM) em reverter a diminuição da resistência ao cisalhamento de braquetes ortodônticos colados após o clareamento. Métodos: 150 primeiros pré-molares superiores foram aleatoriamente divididos em seis grupos experimentais (n= 25): controle negativo (grupo N, sem clareamento), controle positivo (grupo P, clareamento + sem tratamento) e os grupos com tratamento (clareamento + ascorbato de sódio a 10% [grupo AS], gel de extrato de CM a 10% [grupo CM-10], a 20% [grupo CM-20] e a 40% [grupo CM-40]). Após o tratamento, os braquetes foram colados com cimento de ionômero de vidro modificado por resina e, depois, fez-se o teste de resistência ao cisalhamento (SBS) em uma máquina universal de ensaios. Após a descolagem dos braquetes, verificou-se o índice de adesivo remanescente (ARI), com o uso de um microscópio estereoscópico. Os dados da SBS foram submetidos a uma análise de variância (ANOVA) e ao teste de Tukey. Para o ARI, foi utilizado o teste de Kruskal-Wallis. Resultados: houve diferença significativa na SBS (p< 0,001) entre os diferentes grupos. O grupo sem clareamento mostrou resistência ao cisalhamento significativamente maior (8,19 ± 2,26 MPa) do que os outros grupos, enquanto a resistência ao cisalhamento do grupo tratado com o gel de extrato de CM a 40% foi significativamente maior (7,93 ± 1,92 MPa) do que nos outros grupos tratados com antioxidantes. A falha na colagem dos braquetes ortodônticos após o clareamento e tratamento com o extrato de CM ocorreu na interface adesivo/esmalte. Conclusão: a aplicação do extrato de CM como agente antioxidante foi efetiva em reverter a diminuição, que ocorre após o clareamento dentário, na resistência ao cisalhamento da colagem de braquetes ortodônticos.

Antimicrobial Effect of Ethanol Extract of Garcinia mangostana L. against Enterococcus faecalis Isolated from Human Oral Cavity

Enterococcus faecalis is a major causative agent of endodontic treatment failure. The purpose of this study was to investigate bactericidal effects of ethanol extract of Garcinia mangostana L. (mangosteen extract) on five strains of E. faecalis that were isolated from human oral cavities. The bactericidal effects of mangosteen extract were assessed by measurement of minimum bactericidal concentration (MBC) value. The cytotoxicity of mangosteen extract on immortalized human gingival fibroblasts, hTERT-hNOF, was determined based on cell counting method. The data revealed the MBC value of mangosteen extract against the E. faecalis strains was 4 µg/ml. Additionally, the cell viability of mangosteen extract on hTERT-hNOF was 83.7–89.1% at the 1 to 16 µg/ml. These findings indicated that mangosteen extract could be used as a root canal cleaner during management of endodontic treatment failure caused by E. faecalis.

Ethanolic extract of Garcinia mangostana L. pericarp as preservative in antacid suspension

OBJECTIVE: The study was conducted to determine the preservative activity of ethanolic extract of mangosteen (Garcinia mangostana L.) pericarp and its compatibility in an antacid suspension.METHODS: The extract was subjected to phytochemical screening and was used as preservative in a formulated antacid suspension. Compatibility with the active pharmaceutical ingredient (API) and excipients were analyzed using fourier transform-infrared spectroscopy. Preservative activity of the formulation against Escherichia coli, Staphylococcus aureus, and Pseudomonas aeruginosa was assessed using the United States Pharmacopoeia (USP) antimicrobial effectiveness test, with methylparaben as positive control and suspension without preservative as negative control.RESULTS: The extract exhibited pharmaceutical compatibility with API and excipients. The formulation revealed comparable reduction in microbial count of E. coli, S. aureus, and P. aeruginosa with positive control at Day 14 (p=0.916, 0.624, 0.335). At Day 28, comparable activity with positive control was only observed against E. coli and S. aureus (p=0.999, 0.854). However, it displayed significant increase in activity against P. aeruginosa (p=0.010) at Day 28. These activities may be attributed to glycosides and reducing substances present in the extract.CONCLUSION: The ethanolic extract from Garcinia mangostana L. pericarp acted as a preservative in the formulation of an antacid suspension. It conformed to the USP criteria for antimicrobial effectiveness test on bacteria.

In vitro alpha glucosidase inhibition and free-radical scavenging activity of propolis from Thai stingless bees in mangosteen orchard

ABSTRACTThe chemical component and biological activity of propolis depend on flora area of bee collection and bee species. In the study, the propolis from three stingless bee species, Lepidotrigona ventralis Smith, Lepidotrigona terminata Smith, and Tetragonula pagdeni Schwarz, was collected in the same region of mangosteen garden from Thailand. Total phenolic content, alpha glucosidase inhibitory effect, and free-radical scavenging activity using FRAP, ABTS, DPPH assays were determined. The most potent activity of propolis extract was investigated for bioactive compounds and their quantity. The ethanol extract of T. pagdeni propolis had the highest total phenolic content 12.83 ± 0.72 g of gallic acid equivalents in 100 g of the extract, and the strongest alpha glucosidase inhibitory effect with the IC50 of 70.79 ± 6.44 µg/ml. The free-radical scavenging activity evaluated by FRAP, ABTS, DPPH assays showed the FRAP value of 279.70 ± 20.55 µmol FeSO4 equivalent/g extract and the IC50 of 59.52 ± 10.76 and 122.71 ± 11.76 µg/ml, respectively. Gamma- and alpha-mangostin from T. pagdeni propolis extract were isolated and determined for the biological activity. Gamma-mangostin exhibited the strongest activity for both alpha glucosidase inhibitory effect and free-radical scavenging activity. Using HPLC quantitative analysis method, the content of gamma- and alpha-mangostin in the extract was found to be 0.94 ± 0.01 and 2.77 ± 0.08% (w/w), respectively. These findings suggested that T. pagdeni propolis may be used as a more suitable raw material for nutraceutical and pharmaceutical products and these mangostin derivatives as markers.

Efficacy of Garcinia mangostana L. (mangosteen rind extract) to reduce acne severity.

Background: In vitro studies showed that extract of mangosteen rind (EMR) (Garcinia mangostana L.) containing xanthones has antibacterial effect against Propionibacterium acnes and also anti-inflammatory effect. The aim of this study is to determine the efficacy of EMR in reducing acne vulgaris (AV). Methods: A randomized, double-blind, placebo controlled clinical trial was done on 94 subjects (18-30 years) with mild and moderate AV. The treatment group was given 400 mg EMR 3 times daily orally, for 3 weeks and control group was given placebo capsules. As a standard therapy, all subjects were given a topical cream of 0.025% retinoic acid applied on acne lesions during night time. Efficacy was assessed by counting the acne lesion number as well as proportion of subjects with more than 20% decrease in lesion. The decrease of plasma malondialdehyde (MDA) levels were also measured. Results: After 3 weeks of treatment, acne lesion counts was significantly reduced in both groups [from 934 to 584 lesion (37%) in treatment group, p < 0.001 and from 832 to 608 lesion (27%) in control group, p < 0.001]. Comparison between the two groups revealed a non significant difference (p > 0.55). The proportion of subjects whose acne lesion reduced ≥ 20% was 73% (33 of 45 subjects) in treatment group vs 66% (27 of 41 subjects) in control (p > 0.2). The level MDA was reduced from 1.16 to 1.02 nmol/mL in treatment group and from 1.32 become 1.02 nmol/mL in control (p > 0.48). Conclusion: Extract of mangosteen rind given orally for 3 weeks clinically reduced acne severity better than placebo, although statistically was not significant. Antioxidant effect of EMR seem to be unspecific in reducing acne severity.

Docking studies on xanthones of mangosteen as cox-2 inhibitors.

The prostaglandins found in most of the tissues and organs are synthesized by sequential oxidation of cyclooxygenases (COX-1 and COX-2). Prostaglandins synthesized by COX-1 are responsible for the protection of gastrointestinal tract and by COX-2 are responsible for inflammation and pain. The objective of this investigation was to characterize and determine the effect of α-mangostin, β-mangostin and γ-mangostin on COX-1 and COX-2. We have carried out the docking of α, β and γ-mangostin inhibitors into the three dimensional structure of COX-1 and COX-2 enzymes using GOLD software. The inhibitor binding positions and affinity were evaluated using GOLD scoring fitness functions. We identified that amino acid residues Leu52, Arg49, Val33 in COX-1 and Ala18, Ser23, Asp38, Cys22 in COX-2 are important for inhibitor recognition via hydrogen bonding interactions. These hydrogen bonding interactions play an important role for stability of the complex. This information can be exploited to design Mangostin based inhibitors. Our results may be helpful for further experimental investigations.