Efficacy of carboxymethyl chitosan coating on maintaining quality of Sai Nam Pueng tangerine fruits compared to commercial coating

Name: Paranee Borgos

keyword: Carboxymethyl Chitosan

MeSH: Tangerine -- Harvesting -- 306837

Classification :.DDC: e-Theses

; Konjac Glucomannan

MeSH: Postharvest technology

LCSH: Tangerine -- Harvesting -- 306837

LCSH: Postharvest technology

Abstract: The effect of carboxymethyl chitosan coating (1.4% CMCS) with and without konjac glucomannan (0.1% KGM) on postharvest qualities of tangerine cv. ‘Sai Nam Pueng’ was intervalley evaluated and compared with the Commercial A coating during simulated commercial storage (at 5±1°C, 60-65%RH for 28 days followed with 25±2 °C, 60-65%RH for 12 days). Qualities of uncoated and coated Sai Nam Pueng tangerines, including weight loss, firmness, internal gas composition, total soluble solids, titratable acidity, disease incidence, glossiness, and wilting, were investigated. It was found that Commercial A coating outstandingly enhanced the glossiness and firmness, as well as weight loss retardation by 50% compared to the control and the experimental polysaccharide coatings (CMCS and CMCS/KGM). Coatings however exerted no effect on the total soluble solid (TSS 11.2-13.4), titratable acidity (TA 0.65-0.86) but internal gas composition at elevated temperature with an increase of CO2 from 2.5-4% (non-coated) to 4-7% (CMCS), 6-6.5% (CMCS/KGM) and 7-8% (Commercial A) and a decrease of O2 from 18.5% (non-coated) to 10-14%(CMCS), 7-7.5% (CMCS/KGM) and 5-6% (Commercial A), respectively. Based on the average level of internal gas, CMCS coating permitted far better permeability to O2 than CMCS/KGM coating and the Commercial A. On the contrary, there was small differences in the level of internal CO2 among various coatings with Commercial A being significantly less permeance to CO2 than the polysaccharide coatings. It was also observed that KGM potentially increased the accumulation of CO2 on CMCS coating independently of the storage temperature. In this study, CMCS coating with KGM effectively delayed the disease incidence as effectively as the Commercial A coating.

Mae Fah Luang University. Learning Resources and Educational Media Center

Address: CHIANG RAI

Email: library@mfu.ac.th

Name: Wirongrong Tongdeesoontorn

Role: Advisor

Created: 2023

Modified: 2023-11-29

Issued: 2023-11-29

วิทยานิพนธ์/Thesis

application/pdf

CallNumber: e-Theses

eng

DegreeName: Master of Science

Level: Master's Degree

Descipline: Postharvest Technology and Innovation

Grantor: Mae Fah Luang University

©copyrights Mae Fah Luang University

ลำดับที่.	ชื่อแฟ้มข้อมูล	ขนาดแฟ้มข้อมูล	จำนวนเข้าถึง	วัน-เวลาเข้าถึงล่าสุด
1	136953.pdf	6.19 MB	2	2025-09-11 11:32:33

ใช้เวลา

0.029063 วินาที