ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Response of Mosambi sweet orange (Citrus sinensis) to degreening, mechanical waxing, packaging and ambient storage conditions.

Ladaniya, M. S.

Indian Journal of Agricultural Sciences. Volume 71, Number 4, 2001. Pages 234-239.

2001

บทคัดย่อ

Response of 'Mosambi' sweet orange (Citrus sinensis) fruits to degreening by ethylene in continuous flow process, mechanical waxing, packing in vented polyethylene and ambient storage conditions (25 plus or minus 5 deg C; 60-70% RH) was studied. Three preharvest sprays of carbendazim (500 ppm) were applied to fruits at 15 days interval. Respiration rate increased with ethylene treatment during degreening for 48 h and then decreased gradually. Ethylene-treated fruits turned yellow in colour within 48 h while untreated fruits remained green during that period. Weight loss in 'Mosambi' fruit was 8.89-10.05% in Sta-fresh 451 wax coating compared with 2.93% in polyethylene liner packing, while wax-coated fruit packed in polyethylene liner lost 2.03-2.29% of their weight after 30 days. Decay was maximum (22.01%) after 30 days in non-waxed fruit packed in vented polyethylene compared with the control (1.15%). Decay was mainly due to sour rot incited by Geotrichum candidum. Stem-end rots and Penicillium rots were not observed. There was no decay in fungicidal wax (Sta-fresh 451 + 1000 ppm thiabendazole)-coated fruit packed in polyethylene liner. Wax coating reduced respiration rate of 'Mosambi' fruits. Change of colour from green to yellow was quite slow in wax-coated fruit compared to non-coated fruit. After 30 days, yellow colour intensity was more in degreened + non-waxed fruit compared with non-degreened + non-waxed fruit. Fruits packed without polyethylene liner lost more juice and ascorbic acid and had more firmness, TSS and acidity content. Appearance and flavour score was highest after 30 days in degreened fruit treated with Sta-fresh 451 wax (full strength or 1:1 dilution) and packed in vented polyethylene lined CFB boxes.