Effect of Edible Coatings on Softening of the Stored Immature Plums

식용코팅이 미숙 자두의 연화에 미치는 효과

  • Song, Tae-Hee (Department of Food and Nutrition, College of Home Economics, Sookmyung Women's University) ;
  • Kim, Chul-Jai (Department of Food and Nutrition, College of Home Economics, Sookmyung Women's University)
  • 송태희 (숙명여자대학교 식품영양학과) ;
  • 김철재 (숙명여자대학교 식품영양학과)
  • Published : 1999.11.30

Abstract

Immature plums(Prunus salicina L.) were coated with edible coatings, calcium-added methyl cellulose(CaMC) and hydroxy propyl methyl cellulose-15(CaHPMC-15). Weight loss and respiration rate of immature plums coated with CaMC and CaHPMC-15 were lower only at the earlier storage period. The titratable acidity of plums was decreased and pH was increased during storage, Soluble pectin, pectinesterase, and polygalacturonase activity as the marker of softening were commonly increased with storage time, but those increases were lower in CaMC and CaHPMC-15-coated plums. Mechanical firmness became significantly soft during storage, while the coated plums were remained harder. As a result of sensory evaluation, softening of plum tissue was found during storage, but the coated plums had the harder texture. These data suggest that the application of CaMC or CaHPMC-15 coatings into immature plums can reduce the postharvest softening during storage.