The fate of beta-carotene in processed leaves of fluted pumpkin (Telfairia occidentalis Hook. f.): A popular vegetable in Nigerian diet

Badifu, G. I. O.; Akpapunam, M. A.; Mgbemere, V. M.

doi:10.1007/bf01088310

Cited by 23 publications

(17 citation statements)

References 12 publications

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“…Optimum conditions of blanching, time and temperature, are necessary to achieve the desired quality of dried products (Kadam et al 2008). The protective effect of sodium metabisulphite has been demonstrated by Mulay et al (1994) and Badifu et al (1995), which is supported by Singh et al (1997). The latter reported that the use of potassium metabisulphite (KMS) for pretreatment of the green leafy vegetables can reduce the extent of loss of ascorbic acid.…”

Section: Introductionsupporting

confidence: 74%

Retention of nutrients in green leafy vegetables on dehydration

et al. 2011

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The objective of the study was to investigate the influence of dehydration on nutrient composition of Amaranthus gangeticus, Chenopodium album, Centella asiatica, Amaranthus tricolor and Trigonella foenum graecum. The green leafy vegetables (GLV) were steam blanched for 5 min after pretreatment and dried in an oven at 60°C for 10-12 h. The fresh and dehydrated samples were analyzed for selected proximate constituents, vitamins, minerals, antinutrients and dialyzable minerals. Dehydration seems to have little effect on the proximate, mineral and antinutrient content of the GLV. Among the vitamins, retention of ascorbic acid was 1-14%, thiamine 22-71%, total carotene 49-73% and β-carotene 20-69% respectively, of their initial content. Dialyzable iron and calcium in the fresh vegetables ranged between 0.21-3.5 mg and 15.36-81.33 mg/100 g respectively, which reduced to 0.05-0.53 mg and 6.94-58.15 mg/ 100 g on dehydration. Dehydration seems to be the simplest convenient technology for preserving these sources of micronutrients, especially when they are abundantly available. Irrespective of the losses of vitamins that take place during dehydration, dehydrated GLV are a concentrated natural source of micronutrients and they can be used in product formulations. Value addition of traditional products with dehydrated GLV can be advocated as a feasible foodbased approach to combat micronutrient malnutrition.

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Section: Introductionsupporting

confidence: 74%

Retention of nutrients in green leafy vegetables on dehydration

et al. 2011

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“…The process of blanching, for example, has been reported to improve the color, flavor, texture [1,4,6,23], overall acceptability [4,6], and nutrient quality [7] of dried vegetables if done under optimum conditions. Studies on beta-carotene retention in dried vegetables have shown that maximum retention of beta-carotene is obtained by drying vegetables in a solar drier [8][9][10][11][12] compared with open-air sun drying because beta-carotene is highly sensitive to direct sunlight [24], heat [12], air, heat, and light [2,4,5,7,10]. Degradation of carotenes occurs mainly through reactions involving their unsaturated isoprenoid side chains, and lessens their vitamin A activity [25].…”

Section: Introductionmentioning

confidence: 99%

“…Open-air sun dried vegetables retain less beta-carotene, a precursor of vitamin A, than oven-dried [4][5][6], shade dried [7], and solar dried [8][9][10][11][12] vegetables. The rate of beta-carotene retention varies with produce type, but the retention range for solar dried vegetables is reported to be 50-80% [2].…”

Section: Introductionmentioning

confidence: 99%

Physical Quality and Carotene Content of Solar-Dried Green Leafy and Yellow Succulent Vegetables

Mdziniso

Hinds

Bellmer

et al. 2006

Plant Foods Hum Nutr

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The effects of vegetable type, vegetable dimensions, and solar drier load on dehydration rate; and texture, color, water activity, and carotene content of solar-dried carrots, sweet potatoes, and collard greens were studied. Mean dehydration rates (moisture loss,%/hr) for solar dried loads of 430 g/m2 and 715 g/m2 were 3.3 +/- 0.30% and 3.8 +/- 0.20% for carrots and sweet potatoes, respectively. Loads of 360 g/m2 and 465 g/m2 of collard greens had dehydration rates of 6.3 +/- 0.10% moisture loss per hr. The results showed that vegetable type accounted for significant differences (p < 0.01) in dehydration rate, and beta-carotene content. Vegetable dimensions affected (p < 0.05) water activity. Solar drier load affected water activity (p < 0.01), and hue angle (p < 0.05). Beta-carotene contents (dry basis) of dehydrated carrot, sweet potato, and collard treatments were 10.9-17.4%, 7.6-9.8%, and 11.9-21.5%, respectively. Among the carrot treatments, the 5-mm thick slices packed at a load of 715 g/m2 contained the highest beta-carotene (17.4%, dry basis) and vitamin A activity (362 IU/g, dry basis), and good physical properties. For collard greens, the 2-cm and 3-cm wide strips packed at 360 g/m2 loads had the best combinations of high beta-carotene (21.5% and 17.2%, dry basis, respectively), vitamin A activity (357.2 and 293.1 IU/g, dry basis, respectively), and optimal color, texture, and water activity. Beta-carotene losses due to solar dehydration were 48.9-67.5%, 4.0-5.8%, and 1.9-19.8% (dry basis) in carrots, sweet potato and collard greens, respectively.

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“…Telfarias occidentalis, a member of the Cucurbitaceae family popularly known as fluted pumpkin is highly reputed in traditional medicine practice in Nigeria [17]. It is commonly called Ugu in most parts of Nigeria with different parts of the plant being employed for various diseased conditions ranging from convulsion, malaria and anaemia [18].…”

Section: Introductionmentioning

confidence: 99%

Synergistic effect of aqueous extract of <i>Telfaria occidentalis</i> on the biological activities of artesunate in <i>Plasmodium berghei</i> infected mice

Adegbolagun¹,

Emikpe²,

Woranola³

et al. 2014

Afr H. Sci.

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Background: Resistance to most antimalarial drugs has encouraged the use of herbal preparations along with prescribed orthodox drugs. Objective: this study investigated effect of co-administration of aqueous extract of T. occidentalis leaves, commonly used as antimalarial and haematinic agent in Nigeria, and artesunate using P. berghei animal model. Methods: In vivo curative antiplasmodial effect of T. occidentalis (200mg/kg) alone and in combination with artesunate (2mg/kg) were evaluated using albino mice infected with 10 6 parasitized erythrocytes of P. berghei intraperitoneally. The haematological parameters: haemoglobin level, red blood cells and white blood cells and packed cell volume were monitored using standard methods. Results: Aqueous extract of T. occidentalis, artesunate and the combination gave 72.17±4.07%, 70.43± 4.27% and 85.43± 3.65% reduction in parasitaemia after 48hours respectively. A significant enhancement of the PCV was obtained with the co-administration of artesunate and aqueous extract (p < 0.01). Similar trends were also observed with heamatological parameters at 72 hours of administration. Conclusion: This study revealed a synergistic effect of the co-administration on parasite clearance rate of P. berghei infection in mice, with a significant enhancement of haematological parameters within 48 hours of administration. This indicates a rapid rate of recovery from plasmodial infections with the co-administration.

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The fate of beta-carotene in processed leaves of fluted pumpkin (Telfairia occidentalis Hook. f.): A popular vegetable in Nigerian diet

Cited by 23 publications

References 12 publications

Retention of nutrients in green leafy vegetables on dehydration

Retention of nutrients in green leafy vegetables on dehydration

Physical Quality and Carotene Content of Solar-Dried Green Leafy and Yellow Succulent Vegetables

Synergistic effect of aqueous extract of <i>Telfaria occidentalis</i> on the biological activities of artesunate in <i>Plasmodium berghei</i> infected mice

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