บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Imazalil on-line control in post-harvest treatments of citrus fruit.

Altieri G., Di Renzo G.C., Lanza G.

5th International Postharvest Symposium . Volume of Abstract . Verona, Italy 6-11 June 2004 page 21

2004

บทคัดย่อ

Imazalil on-line control in post-harvest treatments of citrus fruit.     Penicillium digitatum and Penicillium italicum represent the main causes of post-harvest loss in citrus fruit medium and long term storage.They could be controlled using fungicide as Imazalil, and fruits are generally treated o­n-line in the packing line.One of the more effective treatment is the fruit immersion in a tub located o­n the packing line after the fruit dumping.However at the present the fungicide concentration during the whole day related to the amount of fruit packed in the line is not controlled.Due to this happen that fungicide is often overdosed o­n the fruit or due to the reduction of fungicide concentration in the washing tub an insufficient fungicide protection during the storage results.

The aim of this work has been the set up of a technique to monitor the Imazalil concentration in the washing tubs used for the treatment of citrus fruits by immersion, in order to monitor and control of the fungicide concentration o­n line during the process.With this aim several parameters of the water/Imazalil solution have been tested, as pH, conductivity and redox potential, but they have shown no correlation with the Imazalil concentration.Then the spectrophotometry has been used to assay the Imazalil concentration: sample solutions (0.5 to 150 ppm) have been exposed to ultraviolet (UV) and near infrared (NIR) wavelengths.

The tests performed have shown that NIR gives good correlation between Imazalil and the prediction model: the standard error of correlation (SEC) is 0.59 and the standard error of validation (SEV) is 3.65, such errors are acceptable both for the quick analysis method and for the minimum measurable concentration.Then UV has been successful employed for the quick determination of the Imazalil concentration (SEC=0.015, SEV=0.683).