In recent years, there has been an increasing trend towards the more efficient utilization of agricultural and food by-products. The insufficient collection and improper disposal of these wastes may generate serious pollution problems and also a significant loss of biomass which could potentially be used to produce various value- added metabolites (Correia, McCue, Magalhães, Macêdo, & Shetty, 2004). Stone fruits, especially plums (Prunus domestica L.), are char- acterized by high contents of dietary fibre, phenolics composed