Research Of Protective Packaging Technology On Paper Relics

In this work, the main research objects are natural herb origin fungistats,whose application in the protection of paper relics from mold contamination which we aimed at studying.especially its combination with packaging technology.The research devoted to develop a mildew proof carton to conserve the paper relics.The best extraction method was compared among water distillation method.sol vent extraction with ultrasonic treatment and soxhlet extraction when extracting litsea cubebajemon grass, lysimachia foenum graecum hance. biond magnolia flower, galangal and fructus cnidii.Disc diffusion method was applied to assess the antimicrobial activities of extracts mentioned above and several essential oil.Lemongrass essential oil, oregano essential oil and clove essential oil showed outstanding antimicrobial ability to Aspergillus niger. Chaetomium globasum and Cladosporium herbarum.which can easily contaminate paper relics.The minimum inhibitory concentration(MIC) of the three kind of essential oil to each test mould specie was tested.The MIC of lemongrass essential oil to A.niger and C.herbarum was 1 μL/mL,to C.globasum was 0.5 μL/mL. Oregano essential oil’s MIC to A.niger and C.herbarum both was 0.5μL/mL, to C.globasum was 0.25 μL/mL. The MIC of clove essential oill to A.niger and C.herbarum was 2uL/mL,to C.globasum was 1μL/mL.The method of three factors quadratic orthogonal was conducted to figure out the ideal compound formula to inhibit the three tested mould. The result showed that the ideal compound formula is 0.25 μL/mL lemon grass essential oil mixed with 0.25 μL/mL oregano essential oil. Plus,the qualitative and quantitative analysis of lemon grass essential oil and Orengano essential oil was analyzed by Gas chromatography-mass spectrometry (GC-MS).The conclusion goes as follows:(1)The main antifungal components of lemon grass EO are citral b and citral a, peaking at 11.747min、12.578min respectively. The absolute content of citral was 89.636 mg/mL. (2) Carvacrol appears to be the main antifungal component in oregano EO.with a absolute content of 114.0295mg/mL and peaked at 13.527min.There was an acceleration experiment being set to detect the influence of fungistats to printer paper and xuan paper under the condition of 35℃, RH90% on their tensile strength,pH value, △E value and chemical group change.All tested formulas displayed no recognizable influence on the indexes above. Oregano essential oil inlunences the color of the inks obviously,while when it compounded with lemongrass essential oil such influence disappeared.In conclusion, taking fungistats’ inhibition ability and negative effects on inks into consideration, the formula of 0.25 μL/mL lemongrass essential oil mixed with 0.25 μL/mL oregano essential oil was chosen as the best concentration to be applied in the packaging research.The volatile concentration of fungistat within packaging was analysed by GC-MS too.the results shown that essential oil volatilized quickly after adding into packaging. The fungistat inside the coated carton reached the max volatilization concentration on the fifth day.while in carton appled with fungistat packet oregano essential oil and lemon grass essential oil reached their max concentration on the 13th day and ninth day respectively.Then oil concentration reducted with the extension of storage time.The concentration was hard to detect when the storage time went to 41 days.In conclusion, under the condition of 35±2℃ and RH90±2%,the protective packaging can conrol growth of mould on the paper inside efficiently.the carton combined with a packet carrying fungistat gave a better conservation effect than carton directly coated with fungistat on the protection of paper relics.