Optical nitrite sensor based on chemical modification of a polymer film.
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.
Kazemzadeh
A
A
Materials and Energy Research Centre, P.O. Box 14155-4777, Tehran, Iran. ASG642001@Yahoo.com
Daghighi
S
S
D015374:Biosensing Techniques / Q000295:instrumentation*; D001959:Bromates / Q000737:chemistry; D002138:Calibration; D002482:Cellulose / Q000031:analogs & derivatives / Q000737:chemistry; D008567:Membranes, Artificial; D008956:Models, Chemical; D009573:Nitrites / Q000737:chemistry*; D010078:Oxazines / Q000737:chemistry; D011108:Polymers / Q000737:chemistry*; D013053:Spectrophotometry / Q000295:instrumentation / Q000379:methods*; D013997:Time Factors; D014466:Ultraviolet Rays
D001959:Bromates; D008567:Membranes, Artificial; D009573:Nitrites; D010078:Oxazines; D011108:Polymers; C005062:acetylcellulose; C007062:gallocyanine; D002482:Cellulose