Citation
Salmah Yusof, . and Tee P.L., . and Wong P.K., . and Hasanah Mohd Ghazali, . (2001) The importance of Roselle Hisbiscus sabdariffa L. as a health food product. [Proceedings Paper]
Abstract
Roselle is now popular for it is scientifically claimed to have high contents of ascorbic acid anthocyanins and other antioxidants. Several epidemiological studies have shown that these compounds have contributed to the well being of health. This study was conducted to determine and quantify the natural antioxidants present in roselle to study its scavenging effects on 1 1-diphenyl-2-pircrylhydrazyl dpph radicals and to evaluate its efficacy in reducing thiobarbituric acid reactive substances tbars formation in linoleic acid system compared to commercially available antioxidants. Results showed that ascorbic acid and b-carotene were present in roselle at substantial level with a content of 141.09 and 1.88 mg/100 g respectively. The total phenolic compounds and total anthocyanins were found to be 296 mg/100 g as gallic acid equivalent gea and 2.53 g/100 g expressed as delphinidin-3-glucoside. Methanolic extract of fresh roselle 1 g/ml has lower tbars formation 0.425 nmole mda/mg linoleic acid compared to all antioxidant standards except bha. Roselle was found to have the free radicals scavenging effects but was much lower than bha and a-tocopherol. These indicate that Roselle is a good source of natural antioxidants that possessed high antioxidative activity that may protect the body system from damage by free radicals and lipid peroxidation.
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Abstract
Roselle is now popular for it is scientifically claimed to have high contents of ascorbic acid anthocyanins and other antioxidants. Several epidemiological studies have shown that these compounds have contributed to the well being of health. This study was conducted to determine and quantify the natural antioxidants present in roselle to study its scavenging effects on 1 1-diphenyl-2-pircrylhydrazyl dpph radicals and to evaluate its efficacy in reducing thiobarbituric acid reactive substances tbars formation in linoleic acid system compared to commercially available antioxidants. Results showed that ascorbic acid and b-carotene were present in roselle at substantial level with a content of 141.09 and 1.88 mg/100 g respectively. The total phenolic compounds and total anthocyanins were found to be 296 mg/100 g as gallic acid equivalent gea and 2.53 g/100 g expressed as delphinidin-3-glucoside. Methanolic extract of fresh roselle 1 g/ml has lower tbars formation 0.425 nmole mda/mg linoleic acid compared to all antioxidant standards except bha. Roselle was found to have the free radicals scavenging effects but was much lower than bha and a-tocopherol. These indicate that Roselle is a good source of natural antioxidants that possessed high antioxidative activity that may protect the body system from damage by free radicals and lipid peroxidation.
Additional Metadata
| Item Type: | Proceedings Paper |
|---|---|
| Additional Information: | Perpustakaan Sultan Abdul Samad Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia. QD415 A1N277 2000 |
| AGROVOC Term: | ROSELLE |
| AGROVOC Term: | HEALTH FOODS |
| AGROVOC Term: | ANTIOXIDANTS |
| AGROVOC Term: | VITAMINS |
| AGROVOC Term: | CHROMATOGRAPHY |
| AGROVOC Term: | EXTRACTS |
| AGROVOC Term: | IN VITRO |
| AGROVOC Term: | MALAYSIA |
| Geographical Term: | MALAYSIA |
| Depositing User: | Ms. Norfaezah Khomsan |
| Last Modified: | 24 Apr 2025 05:27 |
| URI: | http://webagris.upm.edu.my/id/eprint/15944 |
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