Materials
Durian rinds were obtained from local fruits stalls in Penang,Malaysia.Citrus pectin (CP) was purchased from Sigma;Modified Citrus Pectin,MCP (PectaSol) was obtained from EcoNugenices;Metal cations were used as their salt; Pb(NO3)2 NiCl2 CuSO4 were purchased from Sigma;ZnSO4 from Riedel-de-Haen,CdCl2 fromFluka.All other chemicals used wre of analytical grade.