@article {1294, title = {Antihypertensive Assay-Guided Fractionation of Syzygium polyanthum Leaves and Phenolics Profile Analysis Using LCQTOF/ MS}, journal = {Pharmacognosy Journal}, volume = {12}, year = {2020}, month = {November 2020}, pages = {1670-1692}, type = {Research Article}, chapter = {167}, abstract = {

Introduction: Syzygium polyanthum leaves extract that contains gallic acid as the major phenolic compound has shown significant antihypertensive effect, however the amount of gallic acid was inversely-related with magnitude of this effect. This study aimed to conduct bioassay-guided fractionation of S. polyanthum leaves with gallic acid as a reference compound, and to screen for other possible compounds responsible for the antihypertensive effect. Methods: S. polyanthum leaves were extracted using n-hexane, ethyl acetate, methanol, and water. The most active crude extract was fractionated using column chromatography and analyzed for total phenolic content (TPC) (n=3). Crude extracts and the derived fractions were intravenously administered into pentobarbital-anaesthetized Spontaneously Hypertensive rats (n=5) for recording of blood pressure parameters. Liquid Chromatography-Quadruple Time-Off-Flight/Mass Spectrometry was used for determination of chemical composition. One-way and two-way ANOVA were used for statistical analysis using GraphPad{\textregistered} PRISM Version 6. Results: Fractionation of aqueous S. polyanthum leaves extract (ASP) afforded nine fractions, later combined into three fractions (F1ASP, F2ASP, and F3ASP) based on the thinlayer chromatography profiles. ASP has the highest TPC while F2ASP has the lowest TPC. All fractions exhibited significant antihypertensive property, but F2ASP was the most active fraction. Few phenolics with related antihypertensive effects such as 1-galloyl glucose (a gallic acid-derivative majorly found in F2ASP and F3ASP), and other compounds such as polydatin, sesamol, brazilin, eugenol, ellagic acid, kukoamine A, and cyclocurcumin were found across all active fractions. Conclusion: These phenolics may partly contribute to the antihypertensive effect of S. polyanthum leaves, thus further isolation study is recommended.

}, keywords = {Antihypertensive, Bioassay-guided, LCMS, Syzygium polyanthum, Total phenol content (TPC)}, doi = {10.5530/pj.2020.12.227}, author = {Azlini Ismail and Erlena Nor Asmira Abdul Rahim and Muhammad Nor Omar and Wan Amir Nizam Wan Ahmad} } @article {1263, title = {Southeast Asian Medicinal Plants with Angiotensin Converting Enzyme (ACE) Inhibition Properties}, journal = {Pharmacognosy Journal}, volume = {12}, year = {2020}, month = {September 2020}, pages = {1429-1439}, type = {Research Article}, chapter = {1429}, abstract = {

Introduction: This article aims to provide a summary of medicinal plants in the Southeast Asian countries that have an angiotensin-converting enzyme (ACE) inhibitory activity that is therapeutically useful for treating hypertension. Methods: This review paper is a result of extensive searches via electronic database platforms, including Pubmed, Google Scholar, Scopus, and Science Direct with the keyword search terms: ACE enzyme, Southeast Asia countries, plants, and extracts. Results: Thirty-four articles on ACE inhibition activity of 76 Southeast Asian medicinal plants were found and further reviewed. Several plants from Malaysia (Chassalia curviflora, Citrus hystrix, Murraya koenigii, Senna garrettiana), Indonesia (Gnetum Gnemon, Momordica charantia, Nasturtium officinale, Peperomia pellucida, Pereskia saccharose), and Thailand (Mammea siamensis) were found to exhibit strong ACE inhibitory activity in vitro. Bioactive compounds such as 3{\textquoteright},4{\textquoteright}, dihydroxy-3-5 dimethoxy flavone-7-O- β-rhamnose and quercetin-3-O-glucoside showed the highest potency in exhibiting the ACE inhibition activity in this review. Conclusions: This review suggests for an in-depth investigation on the potent crude extracts for the potential development of complementary herbal medicines as well as on the potent ACE inhibitor compounds for further development as new ACE inhibitor candidates for hypertension therapy.

}, keywords = {ACE, Angiotensin-converting enzyme, Antihypertensive, Medicinal plants, Southeast Asia}, doi = {10.5530/pj.2020.12.197}, author = {T A Faiz T Anuar and Azlini Ismail} } @article {864, title = {Syzygium polyanthum (Wight) Walp: A Potential Phytomedicine}, journal = {Pharmacognosy Journal}, volume = {11}, year = {2019}, month = {February 2019}, pages = {429-438}, type = {Review Article}, chapter = {429}, abstract = {

Ethnomedicinal plant is one of the important sources for drug discovery. Syzygium polyanthum (Wight) Walp is one of the ethnomedicinal plants that is currently gaining attention for its various pharmacological potentials. This review evaluates its traditional uses, chemical profiles, toxicological aspects, nutritional values, as well as its pharmacological properties. From our literature search in Science Direct, Scopus, and Google Scholar databases, it was found that S. polyanthum has valuable therapeutic potentials including antidiabetic, antihypertensive, antimicrobial, antioxidant, anticancer, antitumor, antidiarrheal, acetylcholinesterase, inhibitory, and dental plaque inhibition properties. However, few research areas, especially its toxicological profiles, mechanism of actions, as well as identification of its bioactive compound, require more in-depth studies.

}, keywords = {Chemical, Nutritional, Pharmacological, Syzygium polyanthum, Toxicological}, doi = {10.5530/pj.2019.11.67}, author = {Azlini Ismail and Wan Amir Nizam Wan Ahmad} } @article {616, title = {Acute and Sub-Acute Antihypertensive Effects of Syzygium polyanthum Leaf Extracts with Determination of Gallic Acid using HPLC Analysis}, journal = {Pharmacognosy Journal}, volume = {10}, year = {2018}, month = {June 2018}, pages = {663-671}, type = {Original Article}, chapter = {663}, abstract = {

Context: Aqueous decoction of Syzygium polyanthum (ADSP) leaf is one of Malay traditionalremedial- preparations for hypertension. Intravenous ADSP reduced blood pressure of anesthetized Wistar-Kyoto (WKY) and Spontaneously-Hypertensive rats (SHR); however, acute and sub-acute effects of oral ADSP on conscious rats and its bioactive compound(s) are not comprehensively studied. This study aims to examine the acute and sub-acute effects of ADSP in comparison to methanol extract (MESP) on systolic blood pressure (SBP) of conscious WKY and SHR rats, as well as to identify their major phenolic-compound using highperformance- liquid-chromatography (HPLC). Methodology: For acute study, SHR and WKY rats were gavaged with single-dose of ADSP or MESP (2.00, 2.50 or 3.00 g/kg), vehicles, or losartan (0.01 g/kg). SBP was measured after 1, 3, 5, 6 and 24 hr-post-administration. For subacute experiment, SHR rats were gavaged once-daily with ADSP or MESP (2.50 g/kg/day), vehicles, or losartan (0.01 g/kg/day) for 3-week and their SBP was weekly-measured. Phenolic compounds were screened using ferric-chloride test, then gallic acid was determined using HPLC. Results: Acute administration of ADSP (2.50 to 3.00 g/kg) and MESP (2.00 to 3.00 g/ kg) significantly reduced SBP of SHR, but not of WKY rats. Repeated-daily-dose administration of MESP (2.5 g/kg/day) significantly reduced SBP of SHR after 2-week and sustained until 3-week, while ADSP (2.5 g/kg/day) significantly reduced SBP only after 3-week. Gallic acid was the major phenolic-compound in ADSP (157.09 \± 4.18 ppm) and MESP (134.04 \± 10.30 ppm). Conclusion: Oral ADSP and MESP that contain gallic acid possess acute and sub-acute antihypertensive effects in SHR, but MESP\’s effect was more prominent than ADSP

}, keywords = {Antihypertensive, Gallic acid, HPLC, Hypertension, Syzygium polyanthum}, doi = {10.5530/pj.2018.4.109}, url = {http://fulltxt.org/article/647}, author = {Azlini Ismail and Nurul Syahida Ramli and Mahaneem Mohamed and Wan Amir Nizam Wan Ahmad} } @article {482, title = {GC-MS Analysis of Phytochemical Compounds in Syzygium polyanthum Leaves Extracted using Ultrasound-Assisted Method}, journal = {Pharmacognosy Journal}, volume = {10}, year = {2018}, month = {December 2017}, pages = {110-119}, type = {Original Article}, chapter = {110}, abstract = {

Context: Syzygium polyanthum has been traditionally formulated by the folklore for the treatment of diseases including diarrhea, rheumatism, diabetes mellitus, hypercholesterolemia, hypertension, gastritis and hyperuricemia. Normally, its phytochemicals are always extracted using solvent, maceration and steam distillation methods, but the use of ultrasound-assisted extraction (UAE) method is still not well documented. Aims: This study aims to extract the phytochemical compounds present in S. polyanthum leaves using UAE and to identify them by Gas Chromatography-Mass Spectrometry (GC-MS) analysis. Methodology: The leaves were consecutively soaked with n-hexane, ethyl acetate and methanol in a bath sonicator to derive n-hexane (HSP), ethyl acetate (EASP), and methanol (MSP) extracts of S. polyanthum leaves and then the extracts were subjected to GC-MS analysis. Mass-spectral databases of peaks were compared with database from Wiley, NIST and FNSCC libraries for compound identification. Results: GC-MS analyses of HSP, EASP and MSP showed the presence of 21, 27, and 31 peaks, respectively. The major compound for HSP (31.912\%), EASP (27.042\%), and MSP (22.386\%) were unknown compounds which were detected at retention time between 61.980 and 62.29 min, thus requires further characterization. Squalene and phytol were among the other major compounds present in all three extracts. Several identified compounds in the extracts such as squalene, phytol, hentriacontane, palmitic acid, \α-pinene, nerolidol, linalool, \α-tocopherol and \β-tocopherol were known bioactive compounds. Conclusion: GC-MS analyses of n-hexane (HSP), ethyl acetate (EASP), and methanol (MSP) of S. polyanthum leaves extracts have revealed the presence of some known bioactive compounds with therapeutic importance.

}, keywords = {Bioactive compound, GC-MS, Sonication, Syzygium polyanthum, Ultra-sound-assisted}, doi = {10.5530/pj.2018.1.20}, url = {http://fulltxt.org/article/406}, author = {Erlena Nor Asmira Abd Rahim and Azlini Ismail and Muhammad Nor Omar and Umi Nadhirah Rahmat and Wan Amir Nizam Wan Ahmad} }