Carotenoids, tocopherols, minerals and phytate in fresh and carotenoids and tocopherol contents in sun-dried dark green leafy vegetable varieties from the Lindi region, Tanzania
The present study explores the nutritional value of different dark green leafy vegetable (DGLV) varieties from Tanzania. Carotenoids, tocopherols, minerals, and phytates were analyzed in unprocessed and differently sun-dried DGLV. HPLC analyses revealed highest concentrations of lutein-zeaxanthin (2...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Maximum Academic Press
2024-01-01
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| Series: | Technology in Horticulture |
| Subjects: | |
| Online Access: | https://www.maxapress.com/article/doi/10.48130/tihort-0024-0011 |
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| Summary: | The present study explores the nutritional value of different dark green leafy vegetable (DGLV) varieties from Tanzania. Carotenoids, tocopherols, minerals, and phytates were analyzed in unprocessed and differently sun-dried DGLV. HPLC analyses revealed highest concentrations of lutein-zeaxanthin (20.3 mg/100 g estimated fresh weight (FW) in Manihot esculenta), β-carotene (6.89 mg/100 g FW in Cleome gynandra) and α-tocopherol (12.5 mg/100 g FW in Manihot esculenta); thus 100 g of a DGLV could provide up to 116% of the recommended daily intake (RDI) for vitamin A and 168% of the RDI for vitamin E. High concentrations (per 100 g calculated FW) of iron (up to 11.1 mg in Cleome gynandra), calcium (up to 469 mg in Amaranthus viridis) and magnesium (up to 371 mg in Amaranthus graecizans) were found; thus 100 g could contribute up to 80%, 47% and 169% of the RDI for iron, calcium, and magnesium, respectively. HPLC analyses revealed pleasantly low phytate (1.66−13.1 mg/100g FW); this resulted in low phytate-to-mineral molar ratios not exceeding the critical values of bioavailability. The differently sun-dried DGLV had similarly high concentrations of carotenoids and tocopherols compared to the unprocessed fresh DGLV (mg/ 100 g dry weight), with essentially no marked differences between simple open sun-dried and direct and indirect solar drying techniques. In conclusion, results indicate that both, fresh and sundried DGLV could make a substantial contribution to micronutrient supply, e.g. pro-vitamin A and iron in the diets of the Tanzanian population. |
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| ISSN: | 2833-4337 |