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Table 4 Effect of tannin polymerization, galloylation, and hydroxylation on PRP affinity and precipitation

From: Salivary proline-rich protein may reduce tannin-iron chelation: a systematic narrative review

Reference

Method

Tannin type

Polymerization (1)

Galloylation (2)

Hydroxylation of the B ring (3)

[50]

ESI-MS

EgCG, ECG, B2, B2 3-O gallate

↑↑↑

↑↑

[48]

NMR

B2, PGG, TGG, PA monomer

↑↑↑

↑↑

nd

[69]

nephelometry

B1–9, C1, B2 3-O gallate, E

↑↑↑

↑↑

nd

[49]

NMR

PAC as B1, B3, C2

↑↑↑

↑↑

[67]

ESI-MS

B1, B2, B3, B4, C2, C, E, quercetin derivatives

↑↑↑

nd

↑↑

[56]

ESI-MS

EgCG, ECG, B2, B2 3-O gallate, reserpine

↑↑↑

nd

nd

[58]

ITC

GSE as catechin, epicatechin, epicatechin 3-O gallate

↑↑↑

nd

nd

[66]

Competitive binding assay

5GG, gallic acid, EGC

nd

↑↑↑

nd

  1. NMR Nuclear magnetic resonance imaging, ESI-MS electrospray ionization mass spectrometry, ITC isothermal titration calorimetry; B1, B2, B3, B4, C1: proanthocyanidin B1, B2, B3, B4, C1, PGG pentagalloylglucose, TGG tetragalloylglucose, PAC proanthocyanidin, EgCG epigallocatechin gallate, ECG epigallocatechin, PRP proline rich protein, nd not determined