1.Hordeum vulgare (Barley grass) Scavenge Free Radical and Inhibits Formation of Advanced Glycation End Products Formation.
Pershia Nematiasgarabad ; Kirtani AP Anamalay ; Xiu Qing Chong ; Hor Kuan Chan ; Patrick Nwabueze Okechukwu
Malaysian Journal of Medicine and Health Sciences 2022;18(No.6):134-140
Introduction: Advanced glycation end products (AGEs) formation is due to glycation of lipids, proteins, and nucleic
acids. AGEs play a vital role in Diabetes Mellitus (DM) and cardiovascular complications and is enhanced by oxidative stress. Hordeum vulgare (Barley Grass) is a cereal plant of grass family poaceae and has been reported to exhibit
antidiabetic and antioxidant characteristics and prevention of cardiovascular disease. Current experiment focused on
the evaluation of antioxidant and anti-advanced glycation end products formation effect of Hordeum vulgare water
extract. Methods: Free radical scavenging ability of Hordeum vulgare water extract, was evaluated using DPPH,
nitric oxide, hydrogen peroxide, lipid peroxidation, FRAP and metal ion chelating. Total phenolic content of Hordeum vulgare was also analysed. In-vitro antiglycation activity was done using BSA-MGO, BSA-Glu. Phytochemical
screening was performed to detect the presence of flavonoids, saponins, tannins, steroids and terpenoids. Results:
The results showed Hordeum vulgare water extract ameliorated the formation of AGE and scavenge free radical from
DPPH, Nitric oxide, hydrogen peroxide, Lipid peroxidation, FRAP and Metal ion chelating. Phytochemicals such as
saponins, tannins, flavonoids, steroids and terpenoids were detected in Hordeum vulgare water extract. Conclusion:
Hordeum vulgare water extract reveals antiglycation and free scavenging properties.
2.In Vitro Antioxidant Properties and Methylglyoxal (MGO) Scavenging Effects of Centella asiatica Leaves in Water Extract
Xiu Qing Chong ; Li Ann Saw ; Jia Ying Puah ; Kirthani AP Anamalay ; Patrick Nwabueze Okechukwu ; Hor Kuan Chan
Malaysian Journal of Medicine and Health Sciences 2022;18(No.6):183-192
Introduction: Advanced glycation end product (AGE) is formed by the non-enzymatic glycation, leading to free
radicals’ production and high oxidative stress. Accumulation of AGEs is associated with chronic diseases which
are correlated with diabetes mellitus. Centella asiatica is a traditional medicinal herb used in Asia with numerous
pharmacological effects such as antioxidant, wound healing, neuroprotective, and gastrointestinal treatment. This research was aim to evaluate the antioxidant, antiglycation, and phytochemical analysis of C. asiatica leaves (L.) water
extract. Methods: The antioxidant activity of the plant extract was evaluated through 2,2-diphenyl-1-picrylhydrazyl
(DPPH), hydroxyl (OH) radicals, nitric oxide (NO), and chelating capacity assays. Total phenolic content (TPC) was
performed to determine the presence of bioactive compounds, such as saponins, which have been extensively reported in previous studies. Butylated hydroxytoluene (BHT) and ethylenediaminetetraacetic acid (EDTA) were used
as positive control in the antioxidant assays, while quercetin was used in the antiglycation assays. Antiglycation
effects of C. asiatica L. were evaluated through Bovine serum albumin (BSA)-MGO, BSA-glucose, and MGO scavenging assay. The data was expressed in terms of IC50. Result: The plant extract possessed significantly (p < 0.001) lower
IC50 value compared to the BHT in DPPH and NO radical scavenging assay. It also showed stronger antiglycative
effect with lower IC50 value compared to the quercetin in BSA-glucose and BSA-MGO assay. The TPC of C. asiatica
L. was 3.20 mg/GAE/g at 100µg/ml. Conclusion: The antiglycation effects of C. asiaitca L. include the reduction of
Amadori products formation, trapping α-dicarbonyl intermediates, and free radical scavenging. It is suggested that
the antiglycation effects of C. asiatica L. maybe attributed by the presence of saponins and other phytochemicals.