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Table 2 Chemical shifts (δ) and assignment of relevant metabolite resonances in the 1H NMR spectrum of X. fastidiosa leaves extracts

From: Xylella fastidiosa and olive quick decline syndrome (CoDiRO) in Salento (southern Italy): a chemometric 1H NMR-based preliminary study on Ogliarola salentina and Cellina di Nardò cultivars

Metabolites δ (ppm)
Alanine 1.48 (d)
Choline 3.20 (s)
α-Glucose 5.22 (d), 3.50 (dd)
β-Glucose 4.62 (d), 3.22 (t)
Sucrose 5.41 (d), 3.53 (dd)
Hydroxytyrosol 6.90 (d), 6.81 (d), 6.70 (d), 3.78 (t), 2.76 (t)
Tyrosol 6.84 (d), 6.70 (d), 3.78 (t), 2.76 (t)
Oleuropein 6.04 (q), 5.78 (s), 3.89 (sugar protons), 2.68 (d), 2.5 (dd), 1.55 (d)
Other aldehydic and dialdehydic forms of oleuropein and ligstroside 9.22 (s) 9.18 (s), 6.04 (d), 5.74
  1. A typical 600 MHz 1H NMR spectrum with the assignment of the metabolite peaks was reported in Additional file 1: Figure S1
  2. Letters in parentheses indicate the peak multiplicities
  3. s singlet, d doublet, t triplet, dd doublet of doublet, q quartet