The gnetic engineering technology provides a new way to supply food ,With genetically modified microbe plants and animals ,the yield and quality of food are improved greatly Genetic food has brought great economic benefits over the world but new concomitant problems such as food safety also cannot be ignored In this review ,the current situation. Safety and public acceptance of gnetic food described and discussed Finally a view future prospects was prasented.

A concept oil quality evaluation of evaporation concentration process for food liquid was put forward. For the evaporating concentration process of red beet extract liquid, the variation rate of beet red pigments absorbency; with respect to time .M=-dA/dt was taken as the quality evaluation criterion of evaporating concentration process.Under the guide of quality evaluation criterion the evaporating concentration process was optimized and the optimum ascorbic acid concentration in the evaporation concentration process of red beet extract liquid was gived.

Calpain and calpastatin system would play all important role in muscle growth.Myoblast differentiation and fusion in multinucleated muscle cells was studied in myoblasts growth in culture The content of calpastatin in muscle would be related to cell membrane fusion.Myoblast fusion would required calpain activation while its fusibility would depend on the ratio of cell calpain to calpastatin.In the present study. we found that EDTA. EGTA and GET-calpastatin (IV ) inhibited myoblast fosion.GST-calpastatin (IV).a 45KD fused protein could be induced to express by 0.4mmol/L IPTG.When the concentrations of GST-calpastatin (IV) were 2.5 ul/ml and 0.5 ul/ml.cell fusibility were 5% ~ 10% and 10% ~ 15%, respectively.

The changes in carbohydrate enzyme activity and amyloplast membrane structure in potato tubers during storage were. studied by taking tile species. Kexin No.1 as example. The significant increase of level of total sugar and reducing sugar. Which caused the low. temperature sweetening and the colour darkening of fried-chip. was observed in the tubers stored at 4℃ The activities of amylase Starch-phosphorylase and invertase were different during storage at 4℃and 10℃.with the catalytic reaction much favoratable to the conversion from starch to reducing sugar at 4℃. Changes in integrity of amyloplast membrane were observed during storage .The injury to the amyloplast membrane was significant and the electrolyte leakage was higher in the tubers stored at 4℃

This paper studied the method and relevant conditions of extraction and purification of SOD from spent beer yeast The specifie enzymatic activity of resultant SOD was 3048 u /mg. The yield from crude enzyme liquor was 73%,.The purification multiple was 96-fold as such.

In this paper the technique of purifying medicinal medicinal lecithin from soybean molasses by solvent extraction was discussed.lt s main property targers were N%=1.70,P%=4.0%.acid value 10.48 iodine number 93.33.

The purified technology of Soybean phospholipid with supercritical CO₂extraction was studied .The pressure temprature and time which affected the extraction yield were studied too .The best technological parameters were the pressure 30MPa the temperature 50℃ and the operation time 6h.

An Instant drink made from Fructus Sophorae Japonicae was developed.The rutin content and physical characteristics of the product were studied.

When bone meal was resolved by neutral protease pancreatin and alkaline protease the best result came from pancreatin .Studies showed that the dissoluble rate of Ca was 2.56% and the transformable rate of bone Ca was 16.0% that the best proportion of bone meal and pancreatin was from 1000:1 to 2000:1 and that the best reguired was 9 to 10 hours.

The main functional components of tea are purine base and tea polyphenol. In this paper on the basis of physical and chemical properties of tea the factors affecting the extracting rate were brought forward and mean sware analysis studies were made for obtaining ideal results.

Carapax Trionvcis of Trionvx sinensis Wiegmann was made to ultra-exiguous powder by ultrafine comminution The results of 5 function experiments indicated 0.02g/kg-dose group could raise the activity of NK cell and 0.02kg kg.0.20k/kg and 0.40g/kg-dose group all could raise accumulated level of hemolysin antibody and phagocytotis capability of phagocyte in small mouse It concluded that ultra-exiguous powder of Carapax Trionycis enhanced immunity function

it is not only a natural bacteriostat but also strong in bacteriostasis.Bacteriostatic effects of usuic acid oil mold, bacterium, yeast and eream preservation were reported.

Electroactive polypyrrole modified ascorbic acid bio-sensor was prepared by cyclic voltammogram.The polymerization and potential response mechanism were investigated in detail.In the concentration rang of 3.0×1-0-4 ~ 5.0 ×10-8mol/Lthe bio-sensor had a linear response for ascorbic acid with a slope of 57.3mV/PVc.The bio-sensor had advantages such as fast response good steadiness etc.to test the level of ascorbic acid in beverage.

The experiment of extracting technology of the polysaccharide polysaccharide of Houttuynia cordata Thunb was conducted as follows extracting 3 times in hot water 4 hours each time and separating the polysaccharide by alcohol in 85 percent density .The components of the polysaccharide were identified by polyacrylamide gel electrophoresis and thin layer chromatography The polysaccharide was assessed to be a heteroglycan compsed of glacose fructose arabinose galactose xylose rhamnose and unkown pentaglucose.

A simple and rapid method was described for determining determining content by differentiall pulse polarography .The digest was diluted and pipetted into a solution of formaldehyde in an acetate buffer.The hexamethylentetramine,produced by ammonia and formaldehyde reaction was determined electrochemically at-0.9V .The coefficicient of variation was 4.6% to 5.2%,.The recovery rate of nitrogen was 94.5% to 103.1%.Human milk and eleven different food-stuffs were analysed.There was no significant difference between the results by this method and K jeldahl method.

In this study nisin was used in the preservation of refrigerated beef :This paper had two sections the first section was mainly to find out the effective preservative concentration ,throuth on factor experiment-designing 5 preservative solutions with different concentrations dipping each beef group into different solutions. then vacum packaging storing at 2 ±2℃ In the second section .by applying four factors quadratic rotating design. the reciprocity between nisin and calcium propionate .sodium lactate or postassium sorbate was studied. The major results of the study were 1 )Nisin had significant oil beef preservation .The higher the concentration the better the efficaes of the preservation Through statistic analysis the results suggested that the optimal concentration of nisin was 75ppm. 2)By applying four factors quadratic rotating design. we found that nisin had synergistic effect with sodium lactate but counteraction with potassium sorbate.

The effect of heat pretreatment (30℃ 、5℃ 、40℃ 、45℃,24h)on reducing chilling injury (CI) of eggplant fruits stored at 1℃ for 15 days was studied .The results indicated that heat treatment inhibited the respiratory: rate of eggplant fruits, delayed the chilling-induced increase of electrolyte leakage rate and retarded the decrease of total Phenolic content.Development of browning symptoms of CI, in both pitting seeds and flesh of eggplant fruits was inhibited by heat treatment especially in the treatment at 45℃.4h.while the control fruits resulted in severe CI It was suggested that the condition of heat pretreatment at 45℃.24h was significantly effective in Leducing CI of eggplant fruits.