Comparison between local and commercial RJ - use of antioxidant activity and 10-hydroxy-2-decenoic acid as quality parameter
Crenguţa I Pavel, Liviu A Mărghitaş, Dan S Dezmirean, Lavinia I Tomoş, Victoriţa Bonta, Agripina Şapcaliu and Anja Buttstedt
RJ (RJ) is secreted by worker bees of Apis mellifera to feed the queen larvae. Believed to be the longevity factor of queen honey bees and due to its variety of health promoting ingredients, RJ is used worldwide as dietary supplement, health product and in cosmetics. To reach best possible effects, application of high quality RJ is absolutely required. Here we show, based on physicochemical properties and antioxidant activity, a comparison between fresh, local RJ samples obtained directly from beekeepers and commercial ones. Analyses revealed a higher content of 10-hydroxy-2-decenoic acid, a quality parameter of RJ, for local compared to commercial RJ. Furthermore, determined ferric reducing antioxidant power (FRAP) correlated with radical scavenging activity (DPPH) and total polyphenols was significantly higher in local RJ samples. Therefore, our results indicate a higher quality for local RJ compared to commercial.