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Novel bioanalytical tests and biosen...

Mak, Ka Wai.

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Novel bioanalytical tests and biosensor systems for detection of cyanide traces in marine fish.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Novel bioanalytical tests and biosensor systems for detection of cyanide traces in marine fish./
作者:	Mak, Ka Wai.
面頁冊數:	138 p.
附註:	Source: Dissertation Abstracts International, Volume: 65-02, Section: B, page: 0706.
Contained By:	Dissertation Abstracts International65-02B.
標題:	Chemistry, Analytical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3123221

Novel bioanalytical tests and biosensor systems for detection of cyanide traces in marine fish.
Mak, Ka Wai.

Novel bioanalytical tests and biosensor systems for detection of cyanide traces in marine fish. - 138 p.

Source: Dissertation Abstracts International, Volume: 65-02, Section: B, page: 0706.

Thesis (Ph.D.)--Hong Kong University of Science and Technology (People's Republic of China), 2004.

Sodium cyanide has been used in the Philippines to collect tropical marine fishes for aquarium and food trades since the early 1960s. Cyanide fishing is a fast method to stun and collect fishes. By some estimates, more than a thousand tonnes of cyanide have been poured into the waters of the Philippines by fishermen. This practice is damaging the coral reefs irreversibly. In most countries cyanide fishing is illegal, but most of the exporting and importing countries do not have test and certificate systems. Many analytical methods are available for the detection of cyanide in environmental and biological samples. However, most of the techniques are time-consuming, and some lack specificity or sensitivity. Besides, an ultra sensitive cyanide detection method is needed due to the rapid detoxification mechanism in fish. This thesis presents a novel approach to detect cyanide in marine fishes. The detection was achieved by incorporating a cyanide-degrading enzyme, cyanide hydratase (E.C. 4.2.1.66), into a multi-purpose biosensor based on cofactor recycling. The principle is that cyanide hydratase catalyzes the hydration of metal-cyano complex to form formamide. Then formamide is converted by formamidase (E.C. 3.5.1.49) into formate and ammonia. In the biosensor formate dehydrogenase (E.C.1.2.1.2) converts formate into CO2 using NAD+. Corresponding NADH produced is oxidized back to NAD+ by salicylate hydroxylase (E.C. 1.14.13.1) in the presence of salicylate and oxygen. The oxygen consumption, which is proportional to cyanide concentration, is monitored with a Clark-electrode. It has a linear detection range of 3--30 muM cyanide (0.078--0.78 ppm). The advantages of this bioanalytical approach are: the cyanide-degrading enzymes convert the toxic cyanide into a non-toxic product which is then detected in the biosensor, the enzymes that have been used are highly specific, no vigorous sample pre-treatment (reflux distillation) is needed, and no hazardous chemical is used during the analyses.Subjects--Topical Terms:

586156
Chemistry, Analytical.

Novel bioanalytical tests and biosensor systems for detection of cyanide traces in marine fish.
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520 $a Sodium cyanide has been used in the Philippines to collect tropical marine fishes for aquarium and food trades since the early 1960s. Cyanide fishing is a fast method to stun and collect fishes. By some estimates, more than a thousand tonnes of cyanide have been poured into the waters of the Philippines by fishermen. This practice is damaging the coral reefs irreversibly. In most countries cyanide fishing is illegal, but most of the exporting and importing countries do not have test and certificate systems. Many analytical methods are available for the detection of cyanide in environmental and biological samples. However, most of the techniques are time-consuming, and some lack specificity or sensitivity. Besides, an ultra sensitive cyanide detection method is needed due to the rapid detoxification mechanism in fish. This thesis presents a novel approach to detect cyanide in marine fishes. The detection was achieved by incorporating a cyanide-degrading enzyme, cyanide hydratase (E.C. 4.2.1.66), into a multi-purpose biosensor based on cofactor recycling. The principle is that cyanide hydratase catalyzes the hydration of metal-cyano complex to form formamide. Then formamide is converted by formamidase (E.C. 3.5.1.49) into formate and ammonia. In the biosensor formate dehydrogenase (E.C.1.2.1.2) converts formate into CO2 using NAD+. Corresponding NADH produced is oxidized back to NAD+ by salicylate hydroxylase (E.C. 1.14.13.1) in the presence of salicylate and oxygen. The oxygen consumption, which is proportional to cyanide concentration, is monitored with a Clark-electrode. It has a linear detection range of 3--30 muM cyanide (0.078--0.78 ppm). The advantages of this bioanalytical approach are: the cyanide-degrading enzymes convert the toxic cyanide into a non-toxic product which is then detected in the biosensor, the enzymes that have been used are highly specific, no vigorous sample pre-treatment (reflux distillation) is needed, and no hazardous chemical is used during the analyses.
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