บทคัดย่องานวิจัย

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Ozone and postharvest disease control of carrots (Daucus carota L.)

Liew, Chiam Leng

M.Sc., Acadia University (Canada), 1992, 180 pages.

1992

บทคัดย่อ

OZONE AND POSTHARVEST DISEASE CONTROL OF CARROTS (DAUCUS CAROTA L.).

Two carrot postharvest pathogens, Botrytis cinerea Pers and Sclerotinia sclerotiorum de Bary inoculated on potato dextrose agar (in-vitro) and carrots (in-vivo), and uninoculated carrots were exposed to 0.15 mug of ozone/ml of air at varying ozone flow rates.  The ozone flow rates were 0 (control), 50, 100, 200 and 400 ml/min.  Treatment chambers were flushed for 8 hours/day at a total flow rate (air plus ozone) of 500 ml/min.  The experiment was replicated twice at storage temperatures of 2, 8, and 16circC for a period of 28 days.  A reduction of daily growth rates (log mm/day) of the fungi (in-vitro and in-vivo) with increasing ozone flow rates indicated that ozone was fungistatic.  Respiration rate, electrolyte leakage and carrot color were influenced by ozone flow rates.  Respiration rate at 9circC increased from 18.17 (control) to 20.74 mgCO2 kg(-1) hour(-1) (400 ml ozone/min).  Electrolyte leakage increased from 37.42% (control) to 48.85% (400 ml ozone/min).  Using the CIE (L*, a*, b*) sca

 le, the carrot surface appeared lighter (higher L* value) and less vivid (low saturation) with increasing ozone flow rates.  Total color differences between initial (day 1) and final measurements (day 28) indicated that total color differences between control and ozonated carrots increased with increasing ozone flow rates.