Chemical
group
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Methyl  group + + + + + + + + + + + + + + + + + + + +
Methylene group + - - - - - - - - - + - + - + + - - + +
Aromatic  group - - + + + + + + + + + + - + + + + - - -
Amide
Group
- - - - - - - - - - - - + - + + - - + -
Alcohol + + + + + + + + + + + + + + + + + + + +
Ester + + - - - - - - - - - - - - - - + - - +
Ketone + - - - + + - + + - - - - + - - - - - +
Carboxylic acid + - + + + + + + - + - - - - - - - + - -
Cyclic group
Cyclic propane
- + - - - - - - + - + + - + + + + - + +
C-N Linkage + + + - + + + + + + + + + + + + + + + +
Combination and Overtone + + + + + + + + + + + + + + + - - + - +
Table 2: Infrared – spectroscopy analysis of Chemical groups of 20 Different Pestalotiopsis spp.