USE OF CHITOSAN TO PROLONG POSTHARVEST STORAGE OF LIME UNDER - - PDF document

Oral Presentation CRDC 5 21/07/54 1

USE OF CHITOSAN TO PROLONG POSTHARVEST STORAGE OF LIME UNDER DIFFERENT CONDITIONS

Department of Botany, Faculty of Science Chulalongkorn University กราฟแสดงราคามะนาวเฉลียต่อลูก ทีเกษตรกรจําหน่ายได้ในรอบปี 2552

8 9 10 2 3 4 5 6 7

ราคา/ลูก

ทีมา : สํานักงานภายในจังหวัดสมุทรสาครปี 2552

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Oral Presentation CRDC 5 21/07/54 2

Postharvest loss of lime

ทีมา: http://hilight.kapook.com/admin_hilight/spaw2/ imghilight4/news/1_92.jpg

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more effective in controlling the growth of fungus on citrus fruits caused by Penicillium digitatum and Penicillium italicum more effective in controlling the growth of fungus on citrus fruits caused by Penicillium digitatum and Penicillium italicum

Low molecular weight chitosan (0.2%)

improved firmness titratable acidity ascorbic acidity improved firmness titratable acidity ascorbic acidity water content for Murcott tangor stored at 15ºC for 56

• days. (Po-Jung Chien et al., 2005)

water content for Murcott tangor stored at 15ºC for 56

• days. (Po-Jung Chien et al., 2005)

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Application of 2 g chitosan/100 g solution Chitosan on navel orange (2%)

Objective

To determine the induction of disease resistance in lime fruit by chitosan and effect on postharvest quality of lime.

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Part 1 Effect of chitosan treatments on postharvest quality of lime after storage at 25°C for 4 weeks Part 2 Effect of chitosan treatments on postharvest quality of lime after storage at 10°C for 6 weeks

% Weight loss P l l h b Mi lt Ch M t (CR 10) Peel color change by Minolta Chroma Meter (CR-10) Disease appearance scale ranging from 1 to 5 1 = less than 5% disease appearance or no damage 2 = 5-30% disease appearance 3 = 31-60% disease appearance 4 = 61-90% disease appearance 5 = more than 90% disease appearance (Smilanick et al.,2006)

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Effect of chitosan treatments on postharvest quality of lime after storage at 25°C for 4 weeks

Part 1 Part 1

25ºC Distilled water ( t l)

5 min

(control) 0 ppm 5 ppm 5 sub-replicates in 4 replicates 15 ppm

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10ºC Distill water ( t l)

5 min

Part 2 (control) 0 ppm 5 ppm 5 sub-replicates in 4 replicates 15 ppm

Result and discussion

25ºC Percentage of weight loss of lime after treated with chitosan and then stored at 25ºC for 4 weeks.

1.5 2 2.5 3 3.5 % weight loss control 5 ppm 0.5 1 1 2 3 4 % weeks 10 ppm 15 ppm

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Result and discussion

Percentage of lime disease after treated with chitosan and then stored at 25ºC for 4 weeks. 25ºC

20 30 40 50 lime desease control 5 ppm 10 1 2 3 4 % of weeks pp 10 ppm 15 ppm

10ºC

Result and discussion

10ºC Percentage of weight loss of lime after treated with chitosan and then stored at 10ºC for 6 weeks. 2.00 3.00 4.00 5.00 % weight loss control 5 ppm 0.00 1.00 1 2 3 4 5 6 % weeks 10 ppm 15 ppm

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It maintained on the strawberries during 12 days at 7ºC

(Devlieghere et al 2004)

Result and discussion

(Devlieghere et al., 2004)

2% chitosan significantly reduced the disease incidence and the lesion diameter in navel orange fruit compared with control fruit.

(Kaifang Zeng et al., 2010)

Fresh-cut strawberry which were dipped in 1.0% chitosan solution had less weight loss (1.19%), than dipped in control (2.04%) at 2ºC for 10 days and significantly different. (Sirisopha et al.,2005) 25ºC 10 ppm chitosan solution is the best concentration that 5 C can reduce fungal decay and delay weight loss 10°C 5 ppm chitosan treatment showed the best result in delay weight loss However, both hue and light values didn’t show any significant difference among all treatments.

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Chitosan can be used for prolonging the storage life Chitosan can be used for prolonging the storage life and preventing loss of the products after harvest.

Acknowledgements

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Dr.Teerada Wangsomboondee Assist.Prof. Dr.Kanogwan Seraypheap Assist.Prof. Dr.Rath Pichyangkura

Thank you Thank you