Persistence, dissipation behavior and health risk assessment of spiromesifen in brinjal (Solanum melongena L.) by LC-MS/MS

Susheel Singh,Nitisha Patel,Rohan Kansara,Kelvin Gandhi,Hemant Patel,Vanrajsinh Solanki

doi:10.15835/nsb13311028

Abstract

Brinjal (Solanum melongena) is a versatile crop infected by several insects and pests. For the control of these pests, spiromesifen insecticide has been in use to reduce the damage and increase crop production worldwide. Therefore, a field trial was conducted to study dissipation and persistence behavior of spiromesifen 22.9% w/w SC in/on brinjal at the recommended dose (RD) 96 g a.i./ha and double to recommended dose 192 g a.i./ha (2RD). The quantitative analysis of spiromesifen was performed using ultra-high performance liquid chromatography- tandem mass spectrometry (UHPLC-MS/MS). Samples were processed by the Quick, Easy, Cheap, Effective, Rugged and Safe (QuEChERS) method. The analytical method was validated using various parameters viz., linearity (R2≥0.99), sensitivity (LOD and LOQ), accuracy (recovery=70-120%) and precision (RSD≤20%). The spiroemsifen persisted up to 3 days at RD and 5 days at 2RD. The dissipation half-life (DT50) of spriromesifen was 3.64 and 4.10 days at RD and 2RD in brinjal, respectively. However, residues of spiromesifen measured from soil at 0th (2 hr) day and 10th day were below the limit of quantification (BQL). The waiting period deciphered for spiromesifen applied in brinjal was 1 day at the recommended dose. Further, health risk assessment (health risk index<1 and percent health index<100) was performed on the basis of field trial which suggested that the application of spiromesifen in brinjal crop at recommended dose is safe for the end-users.

Highlights

Brinjal (Solanum melongena) is a versatile crop adapted to various agro-climatic regions which can be grown throughout the year globally
The maximum residue limits (MRLs) for pesticide in food was considered to ensure that the method was suitable for the determination of pesticide residue contents
The contemporary finding on DT50 of spiromesifen is differing from the results reported with DT50 for brinjal 1.40-2.18 days (Vinothkumar et al, 2018) and other fruits and vegetables like, green chilli 2.18-2.40 days (Sharma et al, 2007), okra 1.65-1.68 days (Raj et al, 2012), tomato 0.93-1.38 days (Sharma et al, 2014) and cucumber 2.12-2.19 days (Banerjee and Agyani, 2019)

Summary

Introduction

Brinjal (Solanum melongena) is a versatile crop adapted to various agro-climatic regions which can be grown throughout the year globally. It is usually known as eggplant and extensively cultivated in Asian countries (India, Bangladesh, Pakistan, China) and popular in Egypt, France, Italy and United States (Cork et al, 2005 and FAOSTAT, 2019). In 2019, eggplant was the most commonly produced vegetable worldwide, contributing over 55.0 billion metric tons to global vegetable production (Anonymous, 2021). The journal will continue to appear quarterly, as before, with four annual numbers

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