AI SearchEffects of organic acids and salt concentrations on chitosan membrane properties (Record no. 35259)
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| 000 -LEADER | |
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| fixed length control field | 04899nas|a2200409 i 4500 |
| 005 - DATE AND TIME OF LATEST TRANSACTION | |
| control field | 20260818095304.0 |
| 008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION | |
| fixed length control field | 030418s2002 th u m rtt 0| a1eng d |
| 035 ## - SYSTEM CONTROL NUMBER | |
| System control number | .b11880806 |
| 099 #9 - LOCAL FREE-TEXT CALL NUMBER (OCLC) | |
| Classification number | AIT Thesis no. BP-02-11 |
| 100 0# - MAIN ENTRY--PERSONAL NAME | |
| Personal name | Nguyen Thi Quy |
| 245 10 - TITLE STATEMENT | |
| Title | Effects of organic acids and salt concentrations on chitosan membrane properties |
| 260 ## - PUBLICATION, DISTRIBUTION, ETC. | |
| Place of publication, distribution, etc. | Bangkok : |
| Name of publisher, distributor, etc. | Asian Institute of Technology, |
| Date of publication, distribution, etc. | 2002 |
| 300 ## - PHYSICAL DESCRIPTION | |
| Extent | 71 leaves : |
| Other physical details | ill. |
| 490 1# - SERIES STATEMENT | |
| Series statement | Thesis ; |
| Volume/sequential designation | no. BP-02-11 |
| 500 ## - GENERAL NOTE | |
| General note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science, School of Environment, Resources and Development |
| 502 ## - DISSERTATION NOTE | |
| Dissertation note | Thesis (M.Sc.) - Asian Institute of Technology, 2002 |
| 520 ## - SUMMARY, ETC. | |
| Summary, etc. | The membrane prope1iies of two chitosan samples were examined by using six different organic solvents (formic, acetic, propionic, glycolic, lactic and citric acid) as dissolving solvents. Their degrees of deacetylation (DD) are 70% (termed low DD) and 95% (termed high DD). Both chitosans are having a weight average molecular weight of 0.8 M Dalton. The physico-chemical properties of the membranes prepared from these organic acids were characterized. Both degree of deacetylation and the organic acids used affected the membranes properties. The X-ray diffraction patterns indicated that high DD membranes possess three major peaks at 10°, 15° and 20° (28) whereas low DD membranes have their sole peak at 10° (28). High DD membrane prepared from formic, glycolic and citric acids are having relatively lower crystallinity than membranes from other solvents. It is observed that the tensile strength and elongation-at-break increases as the DD increased; however, the swelling index, biodegradability through lysozyme activity and permeability of membranes with sodium salicylate reduced. Propionic acid improved significantly the tensile strength in both low and high DD membranes but gave the lowest pe1meation rate in case of high DD membrane, while glycolic and formic acid resulted in the lowest tensile strength but highest permeability among high DD membranes. Both low and high DD chitosan membrane produced from lactic acid were most resistant to lysozymic degradation. Jn contrast, the low DD citric membrane has been most susceptible to lysozyme. Effect of sodium chloride concentration on preparing chitosan membrane properties was examined. The increase of sodium chloride concentration in the tested range of 0-0.3% reduces crystallinity of the high DD membranes but increases peak intensity of low DD membranes. The increase of sodium chloride concentration increases the swelling index of chitosan membranes. For low DD membrane, sodium chloride in the range of 0 to 0.1 % improved significantly tensile strength but no significant effect on high DD membrane has been observed. There is a sharp reduction in the tensile strength when sodium chloride concentration is increased to 0.3%. This effect ha been more significant in the high DD membranes. Elongation-at-break reduces as sodium chloride concentration increased. Salt concentration is also observed to have an effect on biodegradability and permeability of membrane. Sodium chloride at 0.05% leads to fastest degradation of low DD membrane but no significant effect on high DD membrane. Beyond the other salt concentrations were resistant to lysozyme for both low and high DD membranes. Permeability was increased when low DD membrane was added with 0.05% NaCl; it reduced when the membrane was treated with 0.3% NaCl. The permeability characteristics of high DD membranes have been reversed to that of low DD membranes. Treatments with 0.05 and 0.1 % salt reduce the permeability, whereas it was increased for high DD membrane if 0.3% salt was introduced. This result has been consistent with the X-ray diffractograms of membranes with salt. |
| 650 #0 - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name entry element | Chitosan |
| 650 #0 - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name entry element | Organic acids |
| 700 1# - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Stevens, Willem Frans, |
| Relator term | Chairperson |
| 700 0# - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Suwalee Chandrkrachang, |
| Relator term | Examination committee |
| 700 0# - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Suwabun Chirachanchai, |
| Relator term | Examination committee |
| 700 1# - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Trankler, Josef, |
| Relator term | Examination Committee |
| 710 2# - ADDED ENTRY--CORPORATE NAME | |
| Corporate name or jurisdiction name as entry element | New Zealand |
| Relator term | Scholarship donor |
| 810 2# - SERIES ADDED ENTRY--CORPORATE NAME | |
| Corporate name or jurisdiction name as entry element | Asian Institute of Technology. |
| Title of a work | Thesis ; |
| Volume/sequential designation | no. BP-02-11 |
| 856 ## - ELECTRONIC LOCATION AND ACCESS | |
| Materials specified | Full-Text |
| Uniform Resource Identifier | <a href="http://203.159.5.9/ait-thesis/detail.php?q=B07383">http://203.159.5.9/ait-thesis/detail.php?q=B07383</a> |
| 907 ## - LOCAL DATA ELEMENT G, LDG (RLIN) | |
| a | .b11880806 |
| b | mnait |
| c | u |
| 902 ## - LOCAL DATA ELEMENT B, LDB (RLIN) | |
| a | 240403 |
| 998 ## - LOCAL CONTROL INFORMATION (RLIN) | |
| Operator's initials, OID (RLIN) | 0 |
| Cataloger's initials, CIN (RLIN) | 030418 |
| First date, FD (RLIN) | m |
| -- | a |
| -- | u |
| -- | 0 |
| 945 ## - LOCAL PROCESSING INFORMATION (OCLC) | |
| l | mnait |
| 945 ## - LOCAL PROCESSING INFORMATION (OCLC) | |
| l | mnarc |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Koha item type | 22-AIT Thesis (Replacement) |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Koha item type | 40-Archives |
| 909 ## - LOCAL ITEMS USED | |
| Barcode | Barcode : 30050120682983 |
| CREATED | CREATED : 2013-06-09 |
| RECORD Id | RECORD # : i12739881 |
| LPATRON | LPATRON : 0 |
| LCHKIN | LCHKIN : - |
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| 909 ## - LOCAL ITEMS USED | |
| Barcode | Barcode : 30050120350664 |
| CREATED | CREATED : 2016-10-06 |
| RECORD Id | RECORD # : i13030097 |
| LPATRON | LPATRON : 0 |
| LCHKIN | LCHKIN : - |
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| Withdrawn status | Lost status | Damaged status | Not for loan | Home library | Current library | Shelving location | Date acquired | Cost, normal purchase price | Total checkouts | Full call number | Barcode | Date last seen | Copy number | Price effective from | Koha item type |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Available for Loans | Asian Institute of Technology Library | Asian Institute of Technology Library | AIT Publications | 18/08/2026 | 50.00 | AIT Thesis no. BP-02-11 | 30050120682983 | 18/08/2026 | 3 | 18/08/2026 | 22-AIT Thesis (Replacement) | ||||
| Available for Loans | Asian Institute of Technology Library | Asian Institute of Technology Library | Archives | 18/08/2026 | AIT Thesis no. BP-02-11 | 30050120350664 | 18/08/2026 | 18/08/2026 | 40-Archives |