Compositional Variability in Commercial Tannin and Mannoprotein Products

Files in this Data Supplement:

• Supplemental Tables 1-4_Supplemental Figures 1-2 -
  
  Supplemental Table 1
  Enotannin and mannoprotein products used in the study, showing their codes and grouped according to common manufacturers.
  
  Supplemental Table 2
  Reference compounds and their source used for comparison in the Fourier transform mid-infrared spectroscopic analysis of enotannin products.
  
  Supplemental Table 3
  Monomeric phenolic compounds (mg) contained in 1 g of the enotannin products.
  
  Supplemental Table 4
  Subunit composition (%), mean degree of polymerization (mDP), and average molecular weight derived from phloroglucinolysis analysis, and average molecular weight derived from gel permeation chromatography (GPC) of commercial enotannin products.
  
  Supplemental Figure 1
  Principal component analysis comparing Fourier transform mid-infrared spectra of dried enotannin products with significant reference compounds. Ellipse indicates spectral similarity defined by Hotelling's T-squared distribution (dissimilar or non-significant reference spectra were omitted from the final analysis). (A) all enotannins and significant reference spectra; (B) excluding skin5 and malvidin-3-glucoside; (C) skin4 and significant reference spectra; (D) skin5 and malvidin-3-glucoside spectra.
  
  Supplemental Figure 2
  Partial least squares regression model (R2 of calibration 0.86; R2 of validation 0.69) to predict tannin recovery (% w/w) by methylcellulose precipitable tannin in enotannin products from significant tannin compositional variables.