Exploring the Characteristics of Soil Nonvolatile Metabolites From Geographical Locations in Guizhou Using UPLC...

Area of Science:

• Agricultural Science
• Analytical Chemistry
• Soil Science

Background:

• Soil metabolites reflect biological activity and influence crop quality.
• Understanding soil's role in tobacco flavor is crucial for agricultural development.

Purpose of the Study:

• To establish an ultra-performance liquid chromatography (UPLC) fingerprinting method with chemometrics for characterizing soil nonvolatile metabolites.
• To differentiate soil metabolite profiles associated with distinct tobacco flavor styles in Guizhou.
• To identify characteristic metabolites influencing tobacco flavor formation.

Main Methods:

• Optimized homogenization extraction and UPLC analysis for soil metabolite profiling.
• Established UPLC fingerprinting using 18 soil samples from three distinct flavor regions.
• Applied chemometrics, including Principal Component Analysis (PCA) and Partial Least Squares Discriminant Analysis (PLS-DA), to analyze metabolite data.

Main Results:

• Identified 30 common soil metabolite peaks with high similarity (0.809–0.956).
• Chemometrics revealed significant differences between soil samples from different flavor regions.
• 17 characteristic metabolites were identified as key discriminators, with higher concentrations in honey-sweet regions.

Conclusions:

• The developed UPLC-chemometrics method reliably characterizes soil metabolite profiles.
• Specific soil metabolites are strongly associated with distinct tobacco flavor types.
• This research provides a theoretical basis for understanding soil metabolism's impact on tobacco quality and agricultural applications.