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Table 4 Monitoring macromolecular changes in C. pyrenoidosa by FTIR analysis

From: A novel nanoemulsion-based microalgal growth medium for enhanced biomass production

Wavenumber range (cm−1)

Assignments

Functional groups

Peak (cm−1)

1064–880

Carbohydrate

965

1090–1030

P = O or Si–O

Nucleic acids

1089

1150–1000

C–O/v Si–-O

Polysaccharides/siloxane (carbohydrate peak/siloxane shoulder at 1200 cm−1)

1072

1263

C–O

Ester

1260

1275

C–O–H

Carbohydrates, proteins, DNA, and RNA

1266

1398–1370

CH3, CH2, C–O

Proteins, carboxylic groups

1394

1456–1450

CH2, CH3

Lipid, protein

1456

1550–1640

N–H bending

Amide

1558

1655–1638

C = O

Protein (amide I)

1652–1653

1745–1734

C = O of esters

Membrane lipids, fatty acids

1744

2875–2850

CH2, CH3

Lipids

2852

2930–2920

CH2

Lipids

2922,2924