Influence of passion fruit juice on colour stability and sensory acceptability of non-sugar Yacon-based pastes

This work was aimed at studying the influence of PFJ and/or sodium disulphite on Yacon pulp colour, and evaluating the sensory attributes of Yacon non-sugar pastes. A colour kinetic evaluation of browning in 11 treatments containing Yacon tubers, yellow passion fruit juice (PFJ) and/or sodium disulphite, over the course of 240 minutes was studied to inactivate the PPOs activity. The evaluation of the colour alterations of Yacon tuber by the addition of variable amounts of PFJ and sodium disulphite enabled identification of efficient treatments for the inhibition of browning: T7 (300 g kg ^-1 PFJ), T8 (400 g kg ^-1 PFJ), and T10 (150 g kg ^-1 PFJ + 0.25 g kg ^-1 sodium disulphite). These treatments presented high colour intensity (C*) and an insignificant (P <0.05) total colour degradation (δE). The products elaborated by the cooking of these ingredients were submitted to the acceptability test and data showed that T7 garnered an acceptance index of 78%.