Study On The Degradation Of Deoxynivalenol In Wheat With The Combination Treatment Ozone Water And Ultrasonic

Scabbed wheats in Nanyang City,Henan Province were chosen as materials to study the degradation of deoxynivalenol by ozonized water treatment,ultrasonic treatment and the combination of the above two methods.Besides,the changes of wheat quality were analyzed after the combination treatment.The main conclusions were as follows:(1)Ozone water tempering and soaking could significantly degrade the DON in wheat.During ozone water tempering,the degradation rate of DON increased with the increase of tempering of temperatures and ozone concentrations.When ozone concentration of water was58.32 mg/L and the tempering temperature was 30 ?,the degradation rate reached 19.99%.During ozone water soaking,DON content in scabbed wheat was significantly reduced with the increase of the ozone concentrations of water,solid-liquid ratios,soakingtimes,and the decrease of pH values,and the degradation rate could reach up to 44.12%.(2)The ultrasonic treatment had positive degradation effect on standard DON solution.Increasing of ultrasonic time and amplitude could significantly improve the degradation rate of DON.Increasing the pulse duty factor,the degradation rate of DON increased first and then decreased.When the ultrasonic time was 21 minutes,the amplitude was 50%,and the pulse duty ratio was 100%(the continuous ultrasonic),the degradation rate of DON could reach 33.35%.(3)The ultrasonic treatment could effectively to reduce DON contentin scabbed wheat at a certain extent.Increasing of ultrasonic time,amplitude and pulse duty factor enhanced the degradation of DON in wheat.When the ultrasonic time was 15 minutes,the amplitude was70%,and the pulse duty ratio was 100%,the degradation rate of DON could reach 40.04%.(4)While the best combination treatment of ultrasonic and ozone water was ultrasonic treatment for 5minutes first and followed by ozone water treatment for 5minutes.On this condition,the degradation rate of DON could reach up to 46.99%.In the process of the best combination treatment of ultrasonic and ozone water,the degradation rate of DON was increased with the increase of ozone concentrations of water,ultrasonic amplitude and theratio of treatment time.Through the orthogonal experiment,optimum conditions of extracting DON in wheat were as follows: ozone concentrations of water was 58.32mg/L,the ultrasonic amplitude was 60% and the ratio of treatment time was 9:1.On the above best conditions,the DON degradation rate could reach up to 51.02%.(5)The combination treatment of ultrasonic and ozone water has a certain effect on the quality of wheat.After the combination treatment,L* showed an increasing trend,and there was no significant change in a* and b*.With the increase of ozone concentrations of water,wet gluten content had no significant change,dry gluten content increased at first and then decreased and gluten index decreased at first and then increased.With the increase of ultrasonic amplitude and the ratio of treatment time,wet and dry gluten content decreased and gluten index had no significant change.The combination treatment had little effect on the farinogram properties of wheat flour.And in the pasting properties,the peak viscosity and final viscosity decreased,and the trough,breakdown,setback,peak time and gelatinization temperature had no significant change.