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Effect of processing on carotenoid losses in orange-fleshed sweet potato: from the field to the fork

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Academic year: 2021

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Effect of processing on carotenoid

losses in orange-fleshed sweet

potato: from the field to the fork

Aurélie Bechoff, Keith Tomlins, Claudie Dhuique‐Mayer, Constance Owori, Geoffrey Menya,  Dominique Dufour, Richard Dove, Claude Marouze, Manuel Dornier, Renaud Boulanger &  Andrew Westby

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Carotenoids & diet

• Carotenoids are pigments found in plants. • Some carotenoids have vitamin A activity =  provitamin A carotenoids • Vitamin A ‐ essential micronutrient (for  body; eye; skin) that is only found in diet. • A lack of vitamin A results in vitamin A  deficiency (VAD) • 127 million children affected in the world: – 38% Uganda  – 71% Mozambique

Chemical function gives vitamin A its activity

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Carotenoid degradation

Provitamin A carotenoids are unsaturated structures= 

unstable

Main factors:

Light (UV)

heat 

air oxidation

A

w

Degradation pathways

1.

Isomerisation

2.

Oxidation

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Main preparation of SP in Africa: boiling, steaming & drying

Drying: facilitate transport & storage during off‐season.

Variety of products can be made from dried sweet potato

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Orange fleshed sweet potato

(OFSP)

OFSP ‐

high concentrations of provitamin A 

carotenoids. 

OFSP ‐

way of tackling VAD.

How much provitamin A is lost 

during processing of OFSP?

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