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Potential of chitosan coating in delaying the postharvest anthracnose ( Colletotrichum gloeosporioides Penz.) of Eksotika II papaya
Author(s) -
Ali Asgar,
Muhammad Mahmud Tengku Muda,
Sijam Kamaruzaman,
Siddiqui Yasmeen
Publication year - 2010
Publication title -
international journal of food science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.831
H-Index - 96
eISSN - 1365-2621
pISSN - 0950-5423
DOI - 10.1111/j.1365-2621.2010.02389.x
Subject(s) - postharvest , chitosan , colletotrichum gloeosporioides , mycelium , titratable acid , horticulture , ripening , fungicide , incubation , chemistry , in vivo , biology , food science , microbiology and biotechnology , biochemistry
Summary The in vitro and in vivo fungicidal activity of chitosan was studied against Colletotrichum gloeosporioides , the causal agent of anthracnose in papaya fruits. Chitosan at 1.5% and 2.0% concentrations showed a fungistatic effect with 90–100% inhibition (significant at P ≤ 0.05) of the fungal mycelial growth. Changes in the conidial morphology were also observed with the higher chitosan concentrations after 7‐ h incubation. In vivo studies showed that 1.5% and 2.0% chitosan coatings on papaya not only controlled the fruit decay but also delayed the onset of disease symptoms by 3–4 weeks during 5 weeks storage at 12 ± 1 °C and slowed down the subsequent disease development. However, when leaving the fruits to ripen at ambient temperature (28 ± 2 °C), 2.0% chitosan was less effective than 1.5% in controlling the disease development. Chitosan coatings also delayed the ripening process by maintaining the firmness levels, soluble solids concentration and titratable acidity values during and after storage.