title: Alteration of the Nonsystemic Behavior of the Pesticide Ferbam on Tea Leaves by Engineered Gold Nanoparticles.
abstract: A model system consisting of a nonsystemic pesticide (ferbam), engineered gold nanoparticles (AuNPs) and a plant tissue (tea leaves) was investigated using surface enhanced Raman spectroscopy (SERS). Ferbam has no ability by itself to penetrate into tea leaves. When AuNPs were placed with ferbam onto the surface of tea leaves, however, the SERS signal of the ferbam-AuNPs complex was observed inside of the tea leaves. Within 1 h, the ferbam-AuNPs complex rapidly penetrated into the leaf to a depth of approximately 190 μm, about (1)/3 to (1)/2 of the leaf's thickness. The rate of penetration was dependent on the size of AuNPs, with 30 nm AuNPs-ferbam penetrating more rapidly when compared with complexes made with the 50 and 69 nm AuNPs. These results clearly demonstrated an alteration of the nonsystemic behavior of ferbam in the combined presence with AuNPs. This finding might lead to the development of some new pesticide formulations. Conversely, new toxicity issues may arise as the behaviors and fate of pesticides are altered significantly upon interaction with engineered NPs in the pesticide formulation or environment.
authors.affiliation: Department of Food Science, University of Massachusetts , Amherst, Massachusetts 01003, United States.|State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University , Hefei, 230036, P. R. China.
authors.forename: Ruyan
authors.initials: R
authors.lastname: Hou
authors.affiliation: Department of Food Science, University of Massachusetts , Amherst, Massachusetts 01003, United States.
authors.forename: Zhiyun
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: Department of Food Science, University of Massachusetts , Amherst, Massachusetts 01003, United States.
authors.forename: Shintaro
authors.initials: S
authors.lastname: Pang
authors.affiliation: Department of Food Science, University of Massachusetts , Amherst, Massachusetts 01003, United States.
authors.forename: Tianxi
authors.initials: T
authors.lastname: Yang
authors.affiliation: Department of Veterinary & Animal Sciences, University of Massachusetts , Amherst, Massachusetts 01003, United States.|Massachusetts Pesticide Analysis Laboratory , Amherst, Massachusetts 01003, United States.
authors.forename: John M
authors.initials: JM
authors.lastname: Clark
authors.affiliation: Department of Food Science, University of Massachusetts , Amherst, Massachusetts 01003, United States.
authors.forename: Lili
authors.initials: L
authors.lastname: He
mesh_terms: D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D010575:Pesticides; D013059:Spectrum Analysis, Raman; D013662:Tea
chemical_list: D010575:Pesticides; D013662:Tea; D006046:Gold