Announcements

Job offersmore »

Tweeting Growers

Top 5 - yesterday

Top 5 - last week

Top 5 - last month

Exchange ratesmore »




Antioxidant potential of African and exotic leafy vegetables

African leafy vegetables (ALVs) are thought to contain an immense variety of antioxidants, which may provide nutritional and health benefits. However, there is limited, robust, and comparable information describing their nutritional composition.

The aim of a new study is to determine the antioxidant potential of selected ALVs [black jack (Bidens pilosa L.) and amaranth (Amaranthus hybridus L.)] in comparison with exotic leafy vegetables (ELVs) [lettuce (Lactuca sativa L.), green cabbage (Brassica oleracea), red cabbage (B. oleracea var. capitata)].

Different nonenzymatic and enzymatic antioxidant assays were used to determine plant carbohydrates (CHOs) using high-performance liquid chromatography (HPLC), phenols (Folin–Ciocalteu), ascorbic acid, carotenoids, total antioxidant capacity (TAOC) using reducing ferric ion antioxidant potential (FRAP) and 1,1-diphenyl-2-picrylhydrazyl free radical (DPPH) assays, super oxide dismutase (SOD), catalase (CAT), and peroxidase (POD).

Both amaranth and black jack produced high levels of CHOs, carotenoids, ascorbic acid, and phenols during early vegetative growth [4 weeks after transplanting (WAT)]. Similarly, SOD, CAT, and POD activity for amaranth and black jack also increased during early vegetative development. Conversely, exotic vegetables (lettuce and cabbages) only increased these antioxidants toward maturity.

Overall, ALVs have produced higher concentrations of antioxidants specifically during early vegetative growth stage than the exotic vegetables. The promotion of ALVs could promote a healthy alternative especially in poor rural households.

Access the full study at HortScience

Publication date: 1/6/2017

 


 

Other news in this sector:

3/28/2017 Wageningen researches ways to get people to eat more vegetables
3/21/2017 Peru: Are chillies and peppers Super Foods?
3/17/2017 Reimagining hospital nutrition
3/17/2017 US (CA): UnitedAg opens second health & wellness clinic
3/10/2017 US: Farm-to-school/farmers market nutrition survey looking for Mid-Atlantic growers
3/8/2017 Switching varieties could remedy tomato allergy
3/8/2017 Berries and leafy veg: top heart health foods
2/28/2017 How to eat 10 portions of fruit and veg a day
2/23/2017 Eating "10 a day" of fruit & veg could prevent 7.8m deaths a year
2/21/2017 The effect of LED grow lights on human health
2/20/2017 Lettuce-based hemophilia therapy shows promise
2/15/2017 "Eating fruit & veg can improve motivation in young adults"
2/10/2017 US: Tasteful Selections conclude fourth-annual campaign to help end hunger
2/3/2017 India: Teacher has underperforming students gulp down chili water
1/24/2017 Scientists to give supermarkets a makeover to cut meat consumption
1/23/2017 Health benefits outweigh pesticide risks in fruit and veg
1/19/2017 "Red peppers good for losing weight"
1/18/2017 US (CA): Chilean Blueberries program teaches kids to eat healthy
1/18/2017 Manitoba lingonberries may protect against kidney failure
1/17/2017 Eating hot peppers decreases mortality