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Other Nuclides: 31P, 19F, 15N NMR01:16

Other Nuclides: 31P, 19F, 15N NMR

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Many organic, inorganic, and biological molecules contain spin-half nuclei such as nitrogen-15, fluorine-19, and phosphorus-31. As a result, NMR studies of these nuclei have found extensive applications in chemical and biological research.
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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
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In proton NMR spectroscopy, primary amines and secondary amines showcase their N–H protons as a broad signal in the chemical shift range between δ 0.5 and 5 ppm. The exact position in this range depends on several factors, including sample concentration, hydrogen bonding, and the type of solvent used. Since amine protons undergo fast proton exchange in solution, the protons are labile and therefore do not participate in any splitting with adjacent protons. Thus, the observed peak is...
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  9. Soil Physics
  11. Quantitative Nmr For Detection Of Spinosad Residues In Agricultural Soils

Quantitative NMR for detection of spinosad residues in agricultural soils

Tushar Janardan Pawar1, Siuly Xenia Ramos-Cruz1,2, Israel Bonilla-Landa1

  • 1Red de Estudios Moleculares Avanzados, Instituto de Ecología A.C., Carretera Antigua a Coatepec 351 Xalapa Veracruz 91073 Mexico jose.olivares@inecol.mx.

RSC Advances
|February 19, 2025

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View abstract on PubMed

Summary
This summary is machine-generated.

Quantitative nuclear magnetic resonance (qNMR) offers a non-destructive and efficient method for detecting spinosad pesticide residues in soil. This technique provides a reliable alternative for routine environmental monitoring and ensuring food safety.

Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Agricultural Science

Background:

  • Pesticide residue monitoring in soil is vital for food safety and environmental sustainability.
  • Traditional chromatographic methods for spinosad detection are often destructive and require extensive sample preparation.
  • Spinosad is a widely used insecticide in sustainable agriculture, necessitating efficient detection methods.

Purpose of the Study:

  • To evaluate quantitative nuclear magnetic resonance (qNMR) as a non-destructive and efficient method for spinosad quantification in soil.
  • To establish qNMR as a viable alternative to conventional chromatographic techniques for routine environmental monitoring.
  • To validate the qNMR method for accuracy, linearity, precision, and adaptability to different soil types.

Main Methods:

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  • Quantitative nuclear magnetic resonance (qNMR) spectroscopy was employed for spinosad quantification.
  • Method validation included recovery rate, limit of detection (LOD), limit of quantification (LOQ), linearity, and precision assessments.
  • The qNMR method was tested on diverse soil matrices, including red loamy and black organic soils.

Main Results:

  • The qNMR method demonstrated an 88% recovery rate for spinosad in agricultural soils.
  • The limit of detection (LOD) was 0.0414 mg mL-1 and the limit of quantification (LOQ) was 0.1254 mg mL-1.
  • High linearity (R2 = 0.9928) and precision (coefficients of variation < 1%) were achieved across various soil types.

Conclusions:

  • qNMR is a reliable, cost-effective, and non-destructive alternative to chromatographic methods for spinosad residue analysis in soil.
  • The validated qNMR method supports routine environmental monitoring and regulatory compliance in sustainable agriculture.
  • This technique enhances the ability to manage pesticide residues, contributing to safer food production and environmental protection.