Effect of process parameters on Pullulan aerogel properties
CAO Qinglong1, LEI Qiao1,2,3*, WU Hao1, GAO Wenjing1
1(College of Food Science and Technology,Shanghai Ocean University,Shanghai 201306,China); 2(Shanghai Engineering Research Center of Aquatic-Product Processing & Preservation,Shanghai 201306,China); 3(Laboratory of Quality and Safety Risk Assessment for Aquatic Products on Storage and Preservation(Shanghai),Ministry of Agriculture,Shanghai 201306,China)
Abstract: To explore the preparation conditions of Pullulan (PUL) aerogels,so as to provide basis for the application of PUL aerogels.PUL aerogels were prepared by sol-gel process and vacuum freeze drying process.The porosity,mechanical strength,microstructure and thermal mechanical properties of the products were analyzed by adjusting the technological parameters such as precursor concentration (0.02-0.1 g/mL),pH value (5.0-9.0) and drying time (1-3 d).The porosity of PUL aerogels increased with the increase of precursor concentration,and the relationship between them wasy=99.11-1.21x.In addition,the porosity increases with the increase of pH and drying time.The compressive strength increased with the increase of precursor concentration (y=-4.19+1.56x),decreased slightly with the increase of pH and decreased with the extension of drying time.The hygroscopicity decreased first and then increased with the increase of precursor concentration,increased with the extension of drying time,but did not change significantly with pH.The loading capacity of Australian tea essential oil decreased with the increase of precursor concentration,and increased with the increase of pH.The best drying condition was 2 days.The aerogel products with good porosity,mechanical strength,low moisture absorption rate and good tea essential oil loading capacity can be obtained by using the preparation conditions of precursor concentration of 0.06 g/mL,pH 8.0 and drying time for 2 days,which meet the requirements of production and application in the future.
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