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Residue levels and performance of potassium sorbate and thiabendazole and their co-application against blue mold of apples when applied as water dip treatments at 20 or 53 °C

Fadda, Angela and Barberis, Antonio and D'Aquino, Salvatore and Palma, Amedeo and Angioni, Alberto and Lai, Francesco and Schirra, Mario (2015) Residue levels and performance of potassium sorbate and thiabendazole and their co-application against blue mold of apples when applied as water dip treatments at 20 or 53 °C. Postharvest Biology and Technology, Vol. 106 , p. 33-43. ISSN 0925-5214. Article.

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DOI: 10.1016/j.postharvbio.2015.04.003

Abstract

The efficacy of potassium sorbate (K-sorb) as an antifungal, alone or combined with thiabendazole (TBZ), and hot water at 53 °C, was studied against blue mold on apples. Results demonstrated the fungistatic effect of K-sorb: 2000 mg L−1 significantly reduced Penicillium expansum growth, and a 24 h delay in fungi development was observed in the amended liquid culture. K-sorb at 1% significantly diminished decay incidence, especially when applied at 53 °C. The performance of TBZ was not improved by the co-application of K-sorb. Treatments efficacy was related to K-sorb distribution on fruit surface. ESEM and X-ray qualitative spectra analyses revealed an irregular distribution of K-sorb over the fruit surface and areas with salt accumulation. K-sorb residues remained quite unchanged until 3 d of storage then they declined progressively. Their degradation was influenced by water temperature: it was faster on fruit treated at 53 °C. An inverse relation between P. expansum growth and K-sorb concentration was observed. After 72 h of incubation, P. expansum depleted 99% of K-sorb from liquid culture media.

The low efficacy of K-sorb treatments against blue mold decay on apple fruit may be ascribed to the low persistence of K-sorb residues, to the irregular spatial distribution of the salt on the fruit surface, and the ability of P. expansum to degrade the salt.

Item Type:Article
ID Code:10892
Status:Published
Refereed:Yes
Uncontrolled Keywords:Potassium sorbate residue, potassium sorbate degradation rate, hot water treatments, environmental scanning electron microscopy, energy dispersive X-ray microanalysis
Subjects:Area 03 - Scienze chimiche > CHIM/10 Chimica degli alimenti
Divisions:002 Altri enti e centri di ricerca del Nord Sardegna > CNR-Consiglio Nazionale delle Ricerche > Istituto di scienze delle produzioni alimentari, Sassari
Publisher:Elsevier
ISSN:0925-5214
Deposited On:25 May 2015 11:15

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