Total antioxidant activity in 35 Ugandan fruits and vegetables

Stangeland, Torunn; Remberg, Siv Fagertun; Lye, Kåre Arnstein

doi:10.1016/j.foodchem.2008.07.026

Cited by 121 publications

(96 citation statements)

References 25 publications

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“…Phenol and flavonoid are antioxidants that play major roles in the protection of cells from lethal effects of free radicals and their derivatives [41]. A diet rich in antioxidant compounds (like phenols and flavonoids) therefore helps to strengthen the antioxidant-based defense system in the human body [42] [43]. Total soluble protein and reducing sugar of V. amygdalina broad showed decrease at 4˚C which became highly significant (p < 0.05) at −20˚C (Figure 4, Figure 5).…”

Section: Resultsmentioning

confidence: 99%

Effect of Preservation on Two Different Varieties of <i>Vernonia amygdalina</i> Del. (Bitter) Leaves

Tonukari¹,

Avwioroko²,

Ezedom³

et al. 2015

FNS

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Vernonia amygdalina Del. is one of the leafy vegetables that can be used in an attempt to alleviate the problem of micronutrient malnutrition, prominent in tropical Africa. In order to ensure availability in non-growing areas or seasons, the vegetable needs to be preserved. Processing and preservation methods influence the nutrient content of vegetables. The present study was aimed at determining the effects of preservation on two different varieties of V. amygdalina (bitter) leaves (broad and small leaves). To this effect, evaluations were made on the chlorophyll content, phytochemicals, and antioxidant capacity of the two varieties of bitter leaf (V. amygdalina Del.) stored at 4˚C and −20˚C over a period of two weeks. Results showed a significant decrease in all parameters studied for both varieties at −20˚C except for the free radical reducing power (FRAP), DPPH radical scavenging activity (%RSA) and nitric oxide radical scavenging activity (%RSA) of V. amygdalina broad leaves where increase in scavenging activity was observed. Thus, it was concluded that to preserve the chlorophyll, phenol, total soluble proteins and reducing sugar levels, preservation at 4˚C is recommended. The present study finding would be useful during short-term preservation of bitter leaves for soup preparation and/or its aqueous extract for ethnomedicinal purposes, especially the small leaf variety.

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Section: Resultsmentioning

confidence: 99%

Effect of Preservation on Two Different Varieties of <i>Vernonia amygdalina</i> Del. (Bitter) Leaves

Tonukari¹,

Avwioroko²,

Ezedom³

et al. 2015

FNS

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“…Crops include fruits such as citrus, mangoes, pineapple, banana (both dessert and food types), apple banana, watermelon, jackfruit, pepper, papaya, apples, avocado, and jamun, and vegetables include greens, onions, tomatoes, cucumber, pumpkins, cabbages, egg plants, carrots, and others. This produce offers a rich source of vitamins A and C, minerals, carbohydrates, and roughage (Stangeland et al, 2009), and are therefore essential for a healthy diet. Notwithstanding the relative abundance of this produce and the associated health benefits, the consumption of fruits and vegetables in the region remains below the minimum level recommended by the World Health Organization/Food and Agriculture Organization (FAO), of 400 g per day (Ruel et al, 2005;Kabunga et al, 2015).…”

Section: Background Informationmentioning

confidence: 99%

Current State of Postharvest Fruit and Vegetable Management in East Africa

Wakholi¹,

Cho²,

Mo³

et al. 2015

Journal of Biosystems Engineering

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, 2015Purpose: Fruit and vegetable production is a fast-growing sector in East Africa, and it bears considerable local and international market potential. In an effort to analyze the challenges within this sector and suggest possible solutions, this study reviews the postharvest handling technologies commonly used with fruits and vegetables in East Africa. Methods: During the course of this study, small-scale farmers were identified as the most prominent producers of fruit and vegetable crops in the region. Results: We found that many of these small-scale farmers employed relative simple and inexpensive techniques in handling their limited volumes of produce. Several factors could be addressed to reduce postharvest losses, including weak policies, inferior infrastructure, and poor market strategies. However, the lack of basic knowledge (including demographic, scientific, and economic knowledge) among the stakeholders (e.g., researchers, farmers, governments, nongovernment organizations, and merchants) on how to develop, implement, use, and sustain the recommended handling technologies is probably the most problematic. Conclusions: We recommend that high priority be placed on closing the knowledge gap, which could enhance the efforts of all the stakeholders to address and reduce postharvest losses.

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“…They appear to be able to regulate antioxidant enzyme gene transcription and intercellular signalling cascades involved in the regulation of cell growth, inflammation and many other processes (Stangeland et al 2009). Additionally, several reports have demonstrated that the phenolic compounds exhibit antioxidant, anti-inflammatory, anti-mutagenic, anticarcinogenic, anti-bacterial properties (Negi et al 2008;Fresco et al 2010) (Jeong et al 2010; Jayakumar and Kanthimathi 2011) and possess hypotensive actions (Eno et al 2000) which are in agreement with their vasorelaxant effects (Runnie et al 2004).…”

Section: Discussionmentioning

confidence: 99%

Prevention of cardiotoxicity of aflatoxin B1 via dietary supplementation of papaya fruit extracts in rats

2013

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The aim of the current study was to evaluate the cardioprotective ability of water (WE) and ethanolic (EE) papaya fruits extracts against cardiotoxicity induced by aflatoxin B 1 (AFB 1 ) in rats. Forty two female Sprague-Dawley rats were divided into six treatment groups and treated orally for 2 weeks as follow: control group, the group treated with WE (250 mg/kg b.w), the group treated with EE (250 mg/kg b.w), the group treated orally with AFB 1 (17 lg/kg b.w) and the groups treated orally with AFB 1 plus WE or EE. The results indicated that treatment with AFB 1 resulted in oxidative stress in the heart manifested by the marked increase in cardiac malondialdehyde and calcium levels accompanied with a significant decrease in cardiac total antioxidant capacity. Serum nitric oxide and sodium levels, lactate dehydrogenase and creatine kinase isoenzyme activities were significantly increased, whereas, cardiac Na ? /K ? -ATPase activity and serum potassium were insignificantly affected. Supplementation with WE or EE effectively ameliorated most of the changes induced by AFB 1 . It could be concluded that both extracts attenuated the oxidative stress induced in heart tissue by AFB 1 and WE was more pronounced due to the higher total phenolic contents than in the EE.

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Total antioxidant activity in 35 Ugandan fruits and vegetables

Cited by 121 publications

References 25 publications

Effect of Preservation on Two Different Varieties of <i>Vernonia amygdalina</i> Del. (Bitter) Leaves

Effect of Preservation on Two Different Varieties of <i>Vernonia amygdalina</i> Del. (Bitter) Leaves

Current State of Postharvest Fruit and Vegetable Management in East Africa

Prevention of cardiotoxicity of aflatoxin B1 via dietary supplementation of papaya fruit extracts in rats

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Total antioxidant activity in 35 Ugandan fruits and vegetables

Cited by 121 publications

References 25 publications

Effect of Preservation on Two Different Varieties of &lt;i&gt;Vernonia amygdalina&lt;/i&gt; Del. (Bitter) Leaves

Effect of Preservation on Two Different Varieties of &lt;i&gt;Vernonia amygdalina&lt;/i&gt; Del. (Bitter) Leaves

Current State of Postharvest Fruit and Vegetable Management in East Africa

Prevention of cardiotoxicity of aflatoxin B1 via dietary supplementation of papaya fruit extracts in rats

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Effect of Preservation on Two Different Varieties of <i>Vernonia amygdalina</i> Del. (Bitter) Leaves

Effect of Preservation on Two Different Varieties of <i>Vernonia amygdalina</i> Del. (Bitter) Leaves