title: Antifungal effectiveness of potassium sorbate incorporated in edible coatings against spoilage molds of apples, cucumbers, and tomatoes during refrigerated storage.
abstract: Predominant spoilage molds of fresh apples, cucumbers, and tomatoes stored at 4 °C were isolated and examined for resistance to potassium sorbate (PS) incorporated in polysaccharide edible coatings. The isolated molds were Penicillium expansum, Cladosporium herbarum, and Aspergillus niger from apples. P. oxalicum and C. cucumerinum were isolated from cucumbers and P. expansium and C. fulvum from tomatoes. Guar gum edible coating incorporated with PS was the most effective mold inhibitor, significantly (P<0.05) reducing the isolated spoilage molds for 20, 15, and 20 d of storage at 4 °C on apples, cucumbers, and tomatoes, respectively. PS incorporated into pea starch edible coating was less effective and selectively inhibited the isolated mold species, causing significant (P<0.05) reduction in mold on apples, cucumbers, and tomatoes counts for 20, 10 to 15, and 15 to 20 d of storage at 4 °C, respectively. The isolated mold species exhibited different resistances to PS incorporated in the edible coatings. The greatest inhibition (2.9 log CFU/g) was obtained with C. herbarum on apples and the smallest (1.1 log CFU/g) was with P. oxalicum on cucumbers and the other isolated mold species exhibited intermediate resistance. The coatings tested, in general, inhibited molds more effectively on apples than on tomatoes and cucumbers. Addition of PS to pea starch and guar gum, edible coatings improved the antifungal activity of PS against isolated spoilage molds on apples, cucumbers, and tomatoes. PS inhibition was most effective against C. herbarum on apples and least effective against P. oxalicum on cucumbers.
authors.affiliation: Department of Nutrition and Food Technology, Faculty of Agriculture, The University of Jordan, Amman 11942, Jordan. g.mehyar@ju.edu.jo
authors.forename: Ghadeer F
authors.initials: GF
authors.lastname: Mehyar
authors.forename: Hamzah M
authors.initials: HM
authors.lastname: Al-Qadiri
authors.forename: Hifzi A
authors.initials: HA
authors.lastname: Abu-Blan
authors.forename: Barry G
authors.initials: BG
authors.lastname: Swanson
mesh_terms: D000935:Antifungal Agents / Q000494:pharmacology*; D001234:Aspergillus niger / Q000187:drug effects / Q000302:isolation & purification; D002963:Cladosporium / Q000187:drug effects / Q000302:isolation & purification; D015169:Colony Count, Microbial; D018553:Cucumis sativus / Q000382:microbiology*; D005519:Food Preservation / Q000379:methods; D005638:Fruit / Q000382:microbiology*; D005658:Fungi / Q000187:drug effects* / Q000302:isolation & purification; D005685:Galactans / Q000737:chemistry; D018551:Solanum lycopersicum / Q000382:microbiology*; D027845:Malus / Q000382:microbiology*; D008351:Mannans / Q000737:chemistry; D050296:Microbial Viability / Q000187:drug effects; D010407:Penicillium / Q000187:drug effects / Q000302:isolation & purification; D053149:Plant Gums / Q000737:chemistry; D011134:Polysaccharides / Q000737:chemistry; D012034:Refrigeration; D013011:Sorbic Acid / Q000494:pharmacology*; D013213:Starch / Q000737:chemistry; D013499:Surface Properties; D013997:Time Factors
chemical_list: D000935:Antifungal Agents; D005685:Galactans; D008351:Mannans; D053149:Plant Gums; D011134:Polysaccharides; D013213:Starch; C007894:guar gum; D013011:Sorbic Acid