The Study Of The Application Of Pullulan Polysaccharides To Preserve Agricultural Products

Pullulan polysaccharide is one kind of water-soluble mucilage extracellular polysaccharides by the fermentation of aureobasidium pullulans.Because the molecule has a unique manner of link,pullulan polysaccharides have some special physical and chemical properties.Therefore,pullulan polysaccharide is widely used in medicine,food and industry and other fields.In this paper,the use of special physical and chemical properties of pullulan,which is applied to the preservation of agricultural technologies,has been studied.Initially,the process of pullulan coating preservation films was determined,in terms of the preservation of eggs.Less than 9%pullulan powder was added in distilled water,?heating and stirring for 30 minutes,cooled and then added 2%mix glycerin can;Then three different concentrations of pullulan preservative coating applied eggs fresh,results showed with the increase of the concentration of pullulan,egg quality in dififerent storage time has improved,which the best is pullulan concentration of 7%of the coating processing group,to 52 days of no-show inferior eggs,80%for the second egg,the control group without the coating scattered yellow eggs at this time reached 60 percent,the remaining 40%of the total are poor quality eggs.At the beginning,as an index to determine the amount to coat the pullulan polysaccharide oil antibacterial paper coating process parameters,in terms of the development of the pullulan polysaccharide oil antibacterial paper:pullulan polysaccharide solution concentration of 4%,steel roller coater model 40,between iron bars and rubber roller pressure of 5N;secondly to add 0.25,0.3,0.35,0.4 ?L/mL cinnamon oil coating liquid to produce four types of natural essential oils antibacterial paper,the test paper in the volatile oils rate remained stable;and finally the paper applies Andrias cold fresh meat division of preservation,storage to 22 days,oil dosage 0.35 ?L/Andrias mL antibacterial Paper group Cuts senses still up 11 points,indicating that the overall cut meat giant salamander preservation effect is better.In the development of pullulan was based on carbon dioxide label instructions.Filter paper was identified as label material.And response surface optimization was used for studying the impact on the color of the label.Pullulan concentration = inverted plate volume>added amount of glycerol,and pullulan concentration 7.5g/100g,glycerol dosage 2g/100g,inverted membrane label color value when the amount of 6.5mL maximum 18.49;Finally,carbon dioxide label instructions to study the conditions of use,the label in water reached 0.05mL/cm,the color value of 18.5,discoloration only 80s,while compares the carbon dioxide label instructions and blank label in five environmental humidity conditions hygroscopic,at 99%of ambient humidity 36h,carbon dioxide moisture absorption rate reached 65 percent instructions on the label,40%higher than the blank label instructions say add Mingpululan polysaccharide increases water absorption,helps the indicator color change occurs.