03468nas|a2200421 i 4500 20260817162800.0 240901s2000 th uzm rtt 00| a1eng d .b11834468 AIT Thesis no. BP-00-07 Ruchchada Potinit Antifungal effects of chitosan on paper Bangkok : Asian Institute of Technology, 2000 92 leaves Thesis ; no. BP-00-07 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science, School of Environment, Resources and Development Thesis (M.Sc.) - Asian Institute of Technology, 2000 The aim of this study is to determine the antifungal effect of chitosan on paper. The effect of the different concentrations of chitosan (0.1 %, 0.25%, 0.5% and 1 % chitosan solution) and of oxidized starch (0.1 %, 0.25%, 0.5% and 1 % oxidized starch solution) was compared. In the case of chitosan, the effect of different degrees of deacetylation (70, 85.5 and 90%DD) and molecular weight ( 40,500 and 1,620,000 Da) was determined on the antifungal property against the organisms Aspergillus niger and Aspergillus terreus. Both of these fungi were grown on the sheets of paper placed on potato dextrose agar plate at 25 °C. Then, the fungal growth was observed for seven days. It was observed that higher concentrations (0.025 and 0.05 g/100 cm2 of paper) of chitosan were more effective than lower concentrations (0.005 and 0.013 g/100 cm2 of paper). The growth of fungi was higher on the paper sheets which used oxidized starch and lower on the paper sheets coated with chitosan. Chitosan with higher %DD (90%DD) has more antifungal effect. The effect of molecular weights of chitosan was almost the same, both high and low molecular weights could resist the growth of fungal on paper effectively. The antifungal property of the chitosan was also determined by inoculating the fungi into the potato dextrose broth mixed with chitosan at different concentrations. The results of this experiment showed that the broth with 0.25 g/L chitosan concentration could inhibit the growth of these two fungi approximately 50% in comparison with the control. Chitosan Papermaking Chemistry Pakorn Nuchnoi, Chairperson Stevens, Willem Frans, Examination Committee Suwalee Chandrkrachang, Examination Committee Rakshit, Sudip Kumar, Examination Committee Asian Institute of Technology. Thesis ; no. BP-00-07 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B06968 .b11834468 mnait u 240407 0 990421 m a u 0 mnait mnait mnarc 20 40 Barcode : 30050120684005 CREATED : 2000-04-27 RECORD # : i12257655 LPATRON : 1018493 LCHKIN : 2008-10-28 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 7 TOT RENEW : 5 Barcode : 30050120684021 CREATED : 2000-04-27 RECORD # : i12257667 LPATRON : 1022574 LCHKIN : 2010-05-14 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 4 TOT RENEW : 3 Barcode : 30050120351076 CREATED : 2016-10-06 RECORD # : i13029277 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 6272 6272 0 0 0 0 MAIN MAIN mnait 2026-08-17 50.00 0 AIT Thesis no. BP-00-07 30050120684005 2026-08-17 16:28:00 1 2026-08-17 20 0 0 0 0 MAIN MAIN mnait 2026-08-17 50.00 0 AIT Thesis no. BP-00-07 30050120684021 2026-08-17 16:28:00 2 2026-08-17 20 0 0 0 0 MAIN MAIN mnarc 2026-08-17 0 AIT Thesis no. BP-00-07 30050120351076 2026-08-17 16:28:00 2026-08-17 40