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Table 1 FT-IR absorbance spectra and the corresponding functional groups of the monomers observed during polymerization

From: Tyrosinase and laccase-producing Bacillus aryabhattai TFG5 and its role in the polymerization of phenols

Monomers (3 mM) With standard mushroom tyrosinase Extracellular protein of B. aryabhattai TFG5 Control (without enzyme)
Catechol 578.5 cm–1: Halogens C-Br Strong-Stretching 584.325 cm–1: Halogen C-Br-strong-stretching 1368.25 cm–1: Alcohol OH Medium-Deformation
1631.5 cm-1: Alkenes C =C Variable-Stretching non conjugated C =C 1637.27 cm–1: Alkenes C =C-Variable-Stretching Non conjugated C =C 1739.48 cm–1: Aldehydes C =O Strong-Stretching saturated aliphatic aldehyde
3327.6 cm–1 : Alcohols OH Variable-Stretching hydrogen-bonded 2156.99 cm–1: Amine salts NH-Medium-Stretching-Secondary amine salt  
  3331.43 cm–1: Alcohol OH-Variable-Stretching hydrogen-bonded  
p-Hydroxy benzoic acid 570.8 cm–1Halogens C-Br Strong-Stretching 429.084 cm–1: Sulfur compounds S-S Variable-Stretching 1368.25 cm–1: Alcohol OH Medium-Deformation
1637.3 cm–1: Alkenes C =C Variable-Stretching non conjugated C =C 1644.02 cm–1: Alkenes NH Variable-Stretching Secondary amine salts 1739.48 cm–1: Aldehydes C =O Strong-Stretching saturated aliphatic aldehyde
3340.1 cm–1 Alcohols OH Variable-Stretching hydrogen-bonded 2162.78 cm–1: Amine salts NH Medium-Stretching Secondary amine salts  
  2355.62 cm–1: Amine salts NH Medium-Stretching Tertiary amine salts  
  3402.78 cm–1: Amines NH Weak-Secondary amine  
Ferulic acid 1637.3 cm–1: Alkenes C =C Variable-Stretching non conjugated C =C 556.363 cm–1: Halogens C-Br Strong-Stretching 1637.3 cm–1: Alkenes C =C Variable-Stretching Non conjugated C =C
3340.1 cm–1 : Alcohols OH Variable-Stretching hydrogen-bonded 1325.8 cm–1: Alcohol OH Strong-Deformation 2112.6 cm–1: Alkynes CΞC Variable-Stretching Mono substituted
  1636.3 cm–1: Alkenes C =C Variable-Stretching Non conjugated C =C 3328.53 cm–1: Alcohol OH Variable-Stretching hydrogen-bonded
  2156.99 cm–1: Amine salts NH Medium- Stretching Secondary Amine salts  
  2338.2 cm–1: Amine salts NH Medium-Stretching Tertiary amine salts  
  2369.12 cm–1: Amine salts NH Medium-Stretching Tertiary amine salts  
  3331.43 cm–1: Alcohol OH Variable-Stretching Hydrogen Bonded  
Salicylic acid 1637.3 cm–1: Alkenes C =C Variable-Stretching non conjugated C =C 1214.93 cm–1: Alcohol C-O Strong- Stretching 1637.3 cm–1: Alkenes C =C Variable-Stretching Non conjugated C =C
3340.1 cm–1 : Alcohols OH Variable-Stretching hydrogen-bonded 1367.28 cm–1: Alcohol OH Medium- Deformation 2112.6 cm–1: Alkynes CΞC Variable-Stretching Mono 3328.53substituted
  1737.55 cm–1: Aldehyde C =O Strong- Stretching saturated aliphatic aldehyde 3328.53 cm–1: Alcohol OH Variable-Stretching hydrogen-bonded
  2331.52 cm–1: Amine salts NH Medium to strong-stretching tertiary amine salts  
  3454.8 cm–1: Amines NH Weak- Stretching Secondary amines  
  3627.4 cm–1: Silicon compounds OH Medium-Stretching Broad peak