Stability of spray‐dried encapsulated carotenoid pigments from rosa mosqueta (Rosa rubiginosa) oleoresin

Oleoresin of rosa mosqueta ( Rosa rubiginosa ) was encapsulated with starch or gelatin by spray‐drying. Stability of the powders was studied at 25, 40, and 55°C in the dark. Degradation of trans ‐rubixanthin, trans ‐lycopene, and trans ‐β‐carotene followed a pseudo‐first‐order kinetic model for both encapsulating agents. The gelatin matrix provided a greater protective effect over the main carotenoid pigments, as shown by the lower degradation rate constants and the longer half‐life values at 21°C. In contrast, the carotenoid pigments showed the same degradation rate in starch, but trans ‐β‐carotene was more stable in gelatin. The kinetic compensation effect obtained according to the calculated thermodynamic parameters suggests that the carotenoids are degraded by the same mechanism.