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Controlled release of the herbicide, fluometuron, from matrix granules based on fractionated organosolv lignins

Lookup NU author(s): Dr Richard WilkinsORCiD


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An organosolv lignin and several of its fractions were used to prepare controlled release matrix granules with fluometuron using a melt process. Release profiles of fluometuron from these granules and a commercial granular formulation were studied in vitro. The release rates of fluometuron were considerably reduced from all lignin-based granules as compared to the commercial formulation. The release rates markedly varied with the lignin fraction used in the fluometuron-lignin matrix systems with the corresponding times for 50% release (T50) values ranging from 2.37 to 11.2 days. The variation in release rate of fluometuron was related to the high proportion of low molecular weight lignin and its associated water soluble lignin in the lignin-based granules, in terms of the hydrophobicity of matrix, the content, and release rate of soluble lignin. The release kinetics were fitted to the generalized model for up to 60% release of fluometuron; the kinetics of fluometuron were of the anomalous type for all matrixes in which release rates increased following a delay.

Publication metadata

Author(s): Zhao J, Wilkins RM

Publication type: Article

Publication status: Published

Journal: Journal of Agricultural and Food Chemistry

Year: 2003

Volume: 51

Issue: 14

Pages: 4023-4028

ISSN (print): 0021-8561

ISSN (electronic): 1520-5118

Publisher: American Chemical Society


DOI: 10.1021/jf026092o

PubMed id: 12822941


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