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Articles by Mohd Fadzelly Abu Bakar
Total Records ( 2 ) for Mohd Fadzelly Abu Bakar
  Farrawati Sabli , Maryati Mohamed , Asmah Rahmat , Halijah Ibrahim and Mohd Fadzelly Abu Bakar
  In this study, total phenolic and flavonoid contents as well as antioxidant properties of methanolic extracts of rhizomes and stems of four Zingiberaceae (Etlingera belalongensis, Etlingera velutina, Zingiber vinosum and Zingiber pseudopungens) were investigated. Evaluation of antioxidant activity was conducted using 1,1-diphenyl-2-picrylhydrazyl free radical-scavenging (DPPH) assay, 2-2’-azinobis-3-ethylbenzothioazaline-6-sulphonate radical scavenging (ABTS) assay and Ferric-Reducing Antioxidant Power (FRAP). The results showed the total phenolic and total flavanoid contents were in the range of 5.3-41.7 mg gallic acid equivalent/g and 1.09-5.86 mg catechin equivalent/g of dry sample, respectively. The antioxidant activities of the extracts as assessed by using DPPH and FRAP assays were strongly correlated with all phytochemical tested (p<0.05). As a conclusion, selected tropical gingers found in Sabah investigated in this study can be developed as natural antioxidant agents.
  Nur Amalina Ismail , Mohd Fadzelly Abu Bakar , Fazleen Izzany Abu Bakar , Azlen Che Rahim and Norizati Murdin
  The search for natural antioxidant in replacement to synthetic antioxidant is still on going. Natural antioxidant displayed a wide range of biological and therapeutic activity which could be obtained from fruits, vegetables, nuts, flowers and bark of tree. Fruits produced by Mangifera species are among the underutilized tropical fruits. Most of the research for this genus focused on popular species such as common mango (Mangifera indica). This study was conducted to determine the phytochemical content and antioxidant activities of different parts of the fruits (peel, flesh and seed) of selected underutilized Borneo wild Mangifera species, i.e., Bundu (Mangifera caesia), Dumpiring (Mangifera quadrifida) and Mangga Wani (Mangifera odorata). Spectrophotometric method was used to determine the phytochemicals content (total phenolic, total flavonoid, total anthocyanin and total carotenoid contents) and antioxidant activities [DPPH (2,2-diphenyl-1- picrylhydrazyl), ABTS (2-2’-azinobis(3-ethylbenzothiazoline)-6-sulphonic acid) and FRAP (Ferric Reducing Antioxidant Power)]. Among all the samples tested, phytochemical content was high in peel and seed extracts as compared to the flesh in all three species. Seed extract of M. quadrifida was most effective in scavenging the DPPH and ABTS free radical as well as the most effective in reducing the Fe3+ to Fe2+ as compared to other parts/species. These antioxidant activities were contributed by the high phenolic and flavonoid contents in M. quadrifida seed. Correlation test showed positive relationship between the phenolic and flavonoid contents with ABTS (r = 0.563, r = 0.550, p<0.01) and FRAP (r = 0.896, r = 0.460, p<0.01). As a conclusion, all parts of Mangifera fruits could be further utilize as natural antioxidants.
 
 
 
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