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Vibrational Micro-Raman spectra of same specimens before (Baseline) and after 1 minute biomodification treatment. All agents induced emergence of shoulder at ~1117 cm−1 (black arrow) and increase of Amide III peak at 1235 cm−1 (pointers) which demonstrates collagen crosslinking. CARD: Cardadol; PAC: Proanthocyanidin; LIG: Lignin.
