beta-Cyclodextrin as a photostabilizer of the plant growth regulator 2-(1-naphthyl) acetamide in aqueous solution

• Type: Article in International Scientific Journal
• Date: 2014

Authors

Da Silva, ES (Author) FEUP; Burrows, HD (Author) Other; Wong Wah Chung, P (Author) Other; Sarakha, M (Author) Other

Journal

Title: Journal of Inclusion Phenomena and Molecular Recognition in Chemistry

Vol. 79

Pages: 329-336

ISSN: 0923-0750

Publisher: Kluwer Academic Publishers

Indexing

ISI Web of Knowledge - 1 Citation

Scopus - 1 Citation

Other information

Authenticus ID: P-009-MQD

DOI: 10.1007/s10847-013-0355-5

Abstract (EN): The plant growth regulator 2-(1-naphthyl) acetamide (NAAm) is susceptible to degradation by sunlight and UV light in aqueous solution. Its inclusion complex with beta-cyclodextrin (beta-CD) was characterized by absorption and fluorescence spectroscopy and its photodegradation was compared with that of aqueous solutions of NAAm. The complex was formed with a stoichiometric ratio of 1:1 with a binding constant of 651 M-1. The photodegradation behavior of NAAm in the inclusion complex NAAm:beta-CD was investigated using both UV (lambda = 254 nm) and simulated solar light (Suntest) irradiation. It was found that the NAAm:beta-CD complex increases NAAm photostability towards photochemical degradation markedly. In addition, an influence of beta-CD concentration was also observed on NAAm degradation rate: higher beta-CD concentrations lead to a slower photoinduced transformation. Moreover, some differences were found in the photoproducts in the presence and absence of the cyclodextrin, indicating inhibition of some of the mechanistic pathways. beta-CD stabilizes NAAm photodegradation towards sunlight and UV irradiation, enhancing its efficient application on formulations for the treatment of fruits and vegetables.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8