During 2013 seasons,mature 'Daw' longan fruit was harvested from a GAP-certified orchard at Lamphun province. The A grade fruit for export with panicle attached was placed in 11.5 kg commercial perforated plastic and transported to Pongcharoen Trading Haadyai packing house. The fruit was stored at 5 before experiment in yhe morning. The chemical compound, i.e. HCl (certified food grade,Siam PVS Chemicals Co., Ltd., Thailand), NaCl (certified food grade,Thai Refined Salt Co., Ltd, Thailand) were used.