Optical nitrite sensor based on chemical modification of a polymer film |
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Authors: | Kazemzadeh A Daghighi S |
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Affiliation: | Materials and Energy Research Centre, P.O. Box 14155-4777, Tehran, Iran. ASG642001@Yahoo.com |
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Abstract: | A new, low-cost nitrite sensor was developed by immobilizing a direct indicator dye in an optical sensing film for food and environmental monitoring. This sensor was fabricated by binding gallocyanine to a cellulose acetate film that had previously been subjected to an exhaustive base hydrolysis. The membrane has good durability (>6 months) and a short response time (<7 s). Nitrite can be determined for the range 0.008-1.50 microg/ml with 3delta detection limits of 1 ng/ml. The method is easy to perform and uses acetylcellulose as a carrier. The reagents used for activating the cellulose support are inexpensive, non-toxic and widely available. |
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