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Lookup NU author(s): Julia Spoors,
Dr Larry Winger,
Dr Lai Siew,
Emeritus Professor Colin Self
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To date, no ligand binding assay has been described for the carbamate herbicide asulam, although a variety of physical methods, dependent on pre-concentration of water samples, have been documented for its assessment. However, asulam is increasingly used in sensitive agricultural areas, and statutory regulations concerning its monitoring will undoubtedly become more stringent. Antibodies are optimal partners in ligand binding assays, but it is commonly understood by immunological researchers that where no antibody reactive with a particular antigen has yet been described, the immunogenicity of the antigen may be particularly restricted. By the expedient of employing a specialised approach to final immunisation with an asulam-protein conjugate, prior to the immortalisation of a specific anti-asulam antibody-producing cell, we have succeeded in generating a monoclonal antibody reactive specifically with asulam that can be configured in a convenient immunoassay. This antibody may be used flexibly in a number of ways: small sample volumes of 10 μl can be assessed to sensitivities of 4.35 × 10-7 M (10 μg L-1) while avoiding discrepancies contributed by the assay matrix; this antibody-based assay can also be formatted to deliver sensitivities at levels stipulated by regulatory authorities (e.g., 4.35 × 10-9 M or 0.1 μg L-1) directly from a water sample, without prior pre-concentration.
Author(s): Winger LA; Dessi JL; Self CH; Spoors JA; Siew LK; Jennens L
Publication type: Article
Publication status: Published
Journal: Journal of Environmental Monitoring
ISSN (print): 1464-0325
ISSN (electronic): 1464-0333
Publisher: Royal Society of Chemistry
PubMed id: 12509045
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