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Oxidative status of a yogurt-like fermented maize product containing phytosterols

Descalzo A.M., Rizzo S.A., Servent A., Rossetti L., Lebrun M., Pérez C.D., Boulanger R., Mestres C., Pallet D., Dhuique-Mayer C.. 2018. Journal of Food Science and Technology, 55 (5) : p. 1859-1869.

DOI: 10.1007/s13197-018-3102-5

This work describes the formulation of a functional yogurt-like product based on fermented maize with added phytosterols and its oxidative stability during cold storage. The technological challenge was to stabilize 3.5% esterified phytosterols (between 2 and 3 g of free sterols) in a low-fat emulsion and to preserve the obtained product throughout processing and storage. The natural bioactive compounds: lutein, zeaxanthin, ß-cryptoxanthin, ß-carotene and ¿-tocopherol were detected in the yogurt, and remained stable during 12 days of refrigeration. Higher content of C18:1 n-9 and C18:3 n-3 (six and ninefold, respectively) were obtained in samples with phytosterols. This was desirable from a nutritional point of view, but at the same time it induced lipid oxidation that was 1.4-fold higher in the product with phytosterols than in the controls. The use of a multivariate approach served to find descriptors which were related to treatments, and to explain their behavior over time.

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