Preparation Of Preservative Paper And Its Application In Packaging

Mixing the natural essential oil and the ethylene inhibitor with the functional paper to make the preservative paper for preservation of fruits and vegetables to reduce the loss of fruits and vegetables in the circulation process.Frist,make the gray mold,rhizopus,aspergillus niger as the tested bacterias,to evaluate the bacteriostasis effect of oregano,clove,Litsea cubeba,rosemary,results show that oregano essential oil of three for the test strains had the best antibacterial effect,thus the preparation of plastic wrap and the antibacterial experiment measured the minimum inhibitory concentration for 45 μl/L.By adding the different layers of PVA coating on the core paper,so as to change the air permeability of the preservative paper in different humidity environment.The results show that adding two layers PVA coating can prevents the paper useless caused by the plant oils’volatile,also can produces antibacterial effect in time in high humidity environment.Qualitative analysis about the main components of the oregano essential oil is mensurated by using GC-MS.The result shows that the main components of the oregano are carvacrol and thymol.The absolute content of those are 0.7962g/ml and 0.02998g/ml.Using the GC-MS to analysis the different volatilizations between the oregano essential oil and essential oil paper,the 1-MCP antistaling agent and 1-MCP paper.The results show that essential oil paper can delay the emergence of volatile peak,but the emergence time of the 1-MCP antistaling agent and 1-MCP paper are consistent.Put the essential oil paper,1-MCP paper,composite preservative paper into the bags made by PP/PA/PE composite membrane respectively packing strawberry,apricot and nectarine.Then overall apparent,weight loss rate,breathing physical hardness,soluble solidsascorbic acid content,titratable acidity of these fruits are tested and analyzed during storage,the results show that the best protection of apricot is 60μl/L by essential oil paper or 4mg/L by 1-MCP paper under normal temperature condition,the extended period of 5d under normal temperature conditions;the protections of apricot by essential oil paper,1-MCP paper,composite preservative paper under normal temperature condition are all better than the ones under low temperature conditions,the shelflife are improved to double compared blank group,the extended period of 6d under normal temperature conditions.