Properties of sweet potato starch phosphate monoester were studied. The results showed that theviscosity, holding capacity of moisture and foam, paste clarity of the esterified starch were increased, thegalati--nizating was decreased, and the freeze--thaw stability was increased significantly. Sweet potato starchphosephate moneester could improved the cake quality conspicousely.

Seed Kernel essential oil from Litchi chinests was extracted with pulse high pressureelectric field-supper critical CO2. The extraction was mainly influenced by the water content in litchiseeds. There existed relationShip of a "S" -type attenuate function between the extraction rate of the essential oil and the water content. The extracting rate of the essential oil was logarithmically increasedwith extracting pressure and time. Under suppercritical pressure, over-increasing temprature decreased the extracting rate.

Sterilizing with pulsed light was studied. The results showed that the main factors affecting sterilizing effect were amount of pulsed light flashs, input voltage, the initial concentration Of microorganisms. More than30 pulsed light flashs can kill Bactillus subtilis, yeast from 10~5/ml to 0. The band mainly deciding sterilizing effect was probably ultraviolel wavelenths. Sterilizing with pulsed light did not caused change in specific conductance but cause change in potential.

A method to determine the volatile basic nitrogen in fish and meat by reflectance spectroscopy is reported. The velative standard deriation for the determination 5 μg/ml N is 2. 6% (n = 6)The linear range and the detection limit are 1-8μg/ml, 0. 5μg/ml, respectively. This method has beenapplied in examination of fresh pork and fresh fish with satisfactory results.