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Valorization of Hesperidin from Citrus Residues: Evaluation of Microwave-Assisted Synthesis of Hesperidin-Mg Complex and Their Insecticidal Activity

da Silva, DF; Bomfim, JPA; Marchi, RC; Amaral, JC; Pinto, LS; de Oliveira, RC; Buss, D; Kirk, W; Bruce, T; da Silva, MFGF; Carlos, RM; Ferreira, AG; Forim, MR; Fernandes, JB

Valorization of Hesperidin from Citrus Residues: Evaluation of Microwave-Assisted Synthesis of Hesperidin-Mg Complex and Their Insecticidal Activity Thumbnail


Authors

DF da Silva

JPA Bomfim

RC Marchi

JC Amaral

LS Pinto

RC de Oliveira

D Buss

W Kirk

MFGF da Silva

RM Carlos

AG Ferreira

MR Forim

JB Fernandes



Abstract

The aim of the current study was the valorization of hesperidin, the dominant flavonoid in citrus processing waste, by microwave-assisted synthesis of hesperidin-Mg complex, improving its antioxidant activity and insecticidal potential. Here we show, for the first time, that microwaveassisted synthesis of [Mg(hesp)2(phen)]OAc (1) (hesp: hesperidin, phen: phenanthroline) improve the reaction rate and yield. The nuclear magnetic resonance (NMR) experiments proved to be powerful tools for the identification of three isomers in metal complexes. Moreover, we explore the insecticidal potential of 1 and [Mg(phen)2(Isov)]OAc (2) (Isov : isovanillic acid) complexes against three insects. Complex 1 killed 80% of adults whitefly at 0.14 µmol L-1, and 2 76% at 0.36 µmol L-1. There was a total mortality of Spodoptera frugiperda with 2 at 0.39 µmol L-1, and 83% with 1 at 0.14 µmol L-1. Both have similar activity, and represent a novel group of insecticide for Bemisia tabaci and S. frugiperda; nevertheless, the benefits of both as Myzus persicae repellent require further evaluation.

Acceptance Date Jun 17, 2022
Publication Date Jun 17, 2022
Publicly Available Date Mar 29, 2024
Journal JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
Print ISSN 0103-5053
Pages 772 - 782
Keywords Citrus; citrus waste; hesperidin; magnesium; microwave
Publisher URL http://static.sites.sbq.org.br/jbcs.sbq.org.br/pdf/2021-0434AR_ChemSustainDev.pdf

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