Effects of β-cyclodextrin addition and farming type on vitamin C, antioxidant activity, carotenoids profile, and sensory analysis in pasteurised orange juices

Description

The effects of organic farming, pasteurisation and addition of β-cyclodextrin on the content of vitamin C, colour, carotenoids and antioxidant capacity of orange juices were studied. After pasteurisation at 98°C (20s) and subsequently storage along 145days at room temperature (20-25°C), the loss of vitamin C content was around 30%. The effects of the thermal process on carotenoid were clearly observed in lutein (loss of 16% for organic and traditional 8%) and especially β-cryptoxanthin (loss of 30%). The colour changes were noticeable after the pasteurisation of orange juice and subsequent storage, with significant decreases being observed in lightness and the coordinate a*, while increases were found for coordinates b*, Hue* and chroma. The antioxidant capacity was 0.075±0.01 and 0.053±0.01mMTmL-1 for organic and conventional, respectively, with losses around 40% being found at the end of the storage period. The addition of β-cyclodextrin caused no significant effects on the parameters under analysis. These data showed that strong thermal treatments, such as pasteurisation, adversely affect the nutritional and sensory quality of orange juices.

Abstract

Comunidad Autónoma de Murcia 06804/FPI/07

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