บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Effects of fresh-cut onion processing and storage on health-promoting bioactive compound quercetin.

Martinez J.A., Sgroppo S., Sanchez-Moreno C., De Ancos B., Cano M.P.

5th International Postharvest Symposium . Volume of Abstract . Verona, Italy 6-11 June 2004. page 27

2004

บทคัดย่อ

Effects of fresh-cut onion processing and storage on health-promoting bioactive compound quercetin. White, yellow or red o­nions are known to contain a large amount of flavonoids mainly quercetin (flavonol), conjugated with sugars as glucose.Onions are recognized an the major dietary source of quecetin (aglycon or 0-glycosylated derivatives) related with certain benefits to human health which include anticarcinogenic properties, antiplatelet activity, antithrombotic activity.Nowadays, the consumer demand for healthy, safe, free-additives, natural, fresh-like food, requires o­nly minimum amount effort and time for preparation.That has led to the introduction of ready-to-eat foods prepared by mild or minimally processing methods.One type of minimally processed fruits and vegetables consist of raw fresh cut produce, which have undergone a minimal processing such as peeling, slicing or shredding, washing with 80-200 ppm of sodium hypochlorite solution, packed under modified atmosphere (MAP) in sealed pouches or trays of polymeric films and then storage at refrigerated temperature.

The present research was undertaken in order to clarify the impact of minimally processing (cutting, washing with 60 ppm sodium hypochlorite solution, MAP, refrigerated storage at 4 °C for 30 days) o­n the quercetin content of a common used yellow o­nion-blub cultivar in Spain, Grano de Oro.Total quercetin content in raw material was 557.2 mg kg-1 f.w. No significant statistical differences in total quercetin content were shown between products packed under vacuum and MAP, at the end of 30 days at 4 °C.No significant statistical differences in total quercetin content were shown between water-washing and hypochlorite solution-washing at the end of 30 days at 4 °C, packed under vacuum or MAP.Only slight significant differences in total quercetin content were shown between whole o­nion and cut o­nion product, in all the treatments assayed.Minimal processing seems not modified significantly the quercetin content in o­nion products.