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.

Antimicrobial compression-moulded wheat gluten films containing potassium sorbate

“…dairy, meat and bakery Food Research International 45 (2012) 109-115 products as a yeast, mould and bacteria inhibitor (Fama, Flores, Gerschemon, & Goyanes, 2006;Kristo, Koutsoumanis, & Biliaderis, 2008). The effectiveness of PS, or sorbic acid, in preventing microbial growth and its release properties from several solvent-cast films has been reported previously (Mehyar, Al-Qadiri, Abu-Blan, & Swanson, 2011;Ozdemir & Floros, 2001;Redl, Gontard, & Guilbert, 1996;Sayanjali, Ghanbarzadeh, & Ghiassifar, 2011;Shen, Wu, Chen, & Zhao, 2010;Zactiti & Kieckbusch, 2009), but none of these have works have considered thermoplastically produced films.…”

Essential Oils and Their Principal Constituents as Antimicrobial Agents for Synthetic Packaging Films

“…The AM films incorporated with EOs and/or their principal constituents have the potential for packaging of many food products such as bakery (Suhr and Nielsen 2003; Rodriguez and others 2008; Rokchoy and others 2009; Mehyar and others 2011); dairy (Suppakul and others 2008; Kuorwel and others 2011a); meat, chicken, and fish (Suppakul and others 2003a; Kerry and others 2006; Wu and others 2010); and fresh produce (Rodríguez‐Lafuente and others 2010). There are already some commercial applications for AM packaging systems such as wasabi extract (or Japanese horseradish) used for Japanese rice lunch boxes (Koichiro 1993), Piatech manufactured by Rhone‐Poulec (Cranbury, N.J., U.S.A.) and Daikoku Kasei Co. (Morioka, Iwate, Japan) (Brody and others 2001).…”

Antifungal activity and humidity sensitivity of quaternized cellulose synthesized in NaOH/urea aqueous solution

“…The conventional antifungal agents such as sorbic acid, potassium sorbate, imazalil and sodium orthophenylphenate, have been broadly applied as fungicides for fruits (Mehyar et al 2011;Cabras et al 1999;Montesinos-Herrero et al 2011). However, significant concerns about the impact of these small molecule antifungal agents on the human health and the environment, and low durability are remained (Montesinos-Herrero et al 2011).…”