Table 2.

Summary of FT-IR band frequencies found in plants exposed to NPs and other contaminants (Dokken and Davis, 2007; Lammers et al., 2009; Rico et al., 2015).

Frequency (cm-1)	Literature freq. (cm-1)	Functional group	Molecule/tissue component	From
3100–2800	3100–3000	C–H aromatic	–	Lammers et al., 2009
	3000–2800	C–H aliphatic	–	Lammers et al., 2009
	2960–2940	CH3 asymmetric	Lipids	Dokken and Davis, 2007
	2930–2910	CH2 asymmetric	Lipids	Dokken and Davis, 2007
	2885–2860	CH3 symmetric	Lipids	Dokken and Davis, 2007
	2860–2840	CH2 symmetric	Lipids	Dokken and Davis, 2007
1790–1720	1790–1744	C=O	Carboxyl ester, lipids, esterified pectins	Rico et al., 2015
	1749	COOH	Carboxylate COOH, pectin	Lammers et al., 2009
	1742, 1732	C=O	Ester carbonyls, polysaccharides	Lammers et al., 2009
	1740	C=O (alkyl)	Lipids, esterified pectins	Dokken and Davis, 2007
1700–1500	1664–1648	C=O, C–N	Protein	Rico et al., 2015
	1650	C=O, C–N	Protein	Dokken and Davis, 2007
	1635	Aromatic C=C	Lignin	Dokken and Davis, 2007
	1632	Aromatic C=C	Lignin	Rico et al., 2015
	1630–1605	COOH	Carboxylate COOH, pectin	Lammers et al., 2009
	1568–1536	N–H, C–N	Protein	Rico et al., 2015
	1550	N–H, C–N	Protein	Dokken and Davis, 2007
1300–1180	1250–1240	Asymmetric C–O–H	Cellulose, hemicellulose	Dokken and Davis, 2007
	1248–1216	Asymmetric C–O–H	Cellulose, hemicellulose	Rico et al., 2015
1200–900	1200–900	–	Carbohydrate	Dokken and Davis, 2007
	1150–1060	C–O–C (ether)	Lignin	Lammers et al., 2009
	1150–980	C–O	Starch	Lammers et al., 2009
	1130–1050, 1370	-	Cellulose	Lammers et al., 2009
	1072–1040	C–O	Cellulose, hemicellulose	Rico et al., 2015
	1024–992	-	Carbohydrate	Rico et al., 2015
	928–912	-	Carbohydrate	Rico et al., 2015

Changes in the regions of bands from radish sprouts were compared with data shown in this table.