Table 1.
Chemical groups, representative compounds and spectra wavenumbers found in all ATR-FTIR maize samples of embryos and endosperm of hybrid 1 (high vigour) and hybrid 2 (low-vigour) during the stress time by accelerated ageing.
| Chemical groups | Representatives | FT-IR (cm−1) | References |
|---|---|---|---|
| Proteins | 1655 (1654) | Schulz and Baranska (2007) | |
| Lipids/fatty acids | 1660/1750 (1654/1746) | Schulz and Baranska (2007) | |
| Disaccharides | Sucrose | 1126 (1118) | Schulz and Baranska (2007) |
| Polysaccharides | Cellulose | 1162 (1161) | Schulz and Baranska (2007) |
| Pectin | 1008/1055/1419/1745 (995/1048/1420/1746) | Schulz and Baranska (2007) | |
| Acyclic monoterpenes | Citronellal | 1116 (1118) | Schulz and Baranska (2007) |
| Citronellol | 1377 (1379) | Schulz and Baranska (2007) | |
| Geranyl acetate | 1227/1738 (1238/1746) | Schulz and Baranska (2007) | |
| Monocyclic monoterpenes | Terpinen-4-ol | 1050 (1048) | Schulz and Baranska (2007) |
| Bicyclic monoterpenes | 1,8-Cineol | 1374 (1379) | Schulz and Baranska (2007) |
| α-Pinene | 1658 (1654) | Schulz and Baranska (2007) | |
| Sabinene | 1653 (1654) | Schulz and Baranska (2007) | |
| Sesquiterpenes | α-Bisabolol | 1375 (1379) | Schulz and Baranska (2007) |
| Tetraterpenes | β-Carotene | 1454 (1460) | Schulz and Baranska (2007) |
| Lycopene | 1379 (1379) | Schulz and Baranska (2007) | |
| Akyl halide | C-X | 500-1400 (600/720/995) | Lopes and Fascio (2004) |
| Aril-alkyl-ether | C-O | 1020-1100/1220-1280 | Lopes and Fascio (2004) |
| (1048/1097/1238) | |||
| Aril-alkyl-amine | C-N | 1180-1280/1250-1360 | Lopes and Fascio (2004) |
| (1238/1301/1320) | |||
| Alkyl-ether | C-O | 1080-1150 (1097/1118) | Lopes and Fascio (2004) |
| Alkyl-amine | C-N | 1030–1230 | Lopes and Fascio (2004) |
| (1048/1097/1118/1161/1238) | |||
| Nitro group | NO2 | 1300-1380/1500-1570 | Lopes and Fascio (2004) |
| (1301/1320/1379/1544) | |||
| Alkane | CH3, CH2 | 1375/1465/2840-3000 | Lopes and Fascio (2004) |
| (1379/1460/2856/2925/3009) | |||
| Alckene | C=C | 1620-1680/3000-3100 (1654/3009) | Lopes and Fascio (2004) |
| Aril-ketone | C=O | 1630-1700 (1654) | Lopes and Fascio (2004) |
| Alkyl-ketone | C=O | 1700-1770 (1711/1746) | Lopes and Fascio (2004) |
| Tertiary amide | C=O | 1630-1700 (1654) | Lopes and Fascio (2004) |
| Carboxylic acid | O-H | 2500-3200 (2856/2925/3009) | Lopes and Fascio (2004) |
| Oleophynes | C=C | 680-1000/1630-1680 (995/1654) | Lopes and Fascio (2004) |
| Ester | C=O | 1670-1750 (1711/1746) | Lopes and Fascio (2004) |
| Aromatic | C-H | 3000-3100 (3009) | Lopes and Fascio (2004) |
| Unknown | 1420 | Lopes and Fascio (2004) | |
| Alkynea | C≡C | 2100-2260 (2103/2146) | Lopes and Fascio (2004) |
| Amineb | N-H | 3200-3600 (3200) | Lopes and Fascio (2004) |
| Benzenec | C-H | 690-710/735-770/800-860 (704/763/8611111) | Lopes and Fascio (2004) |
a,b,cChemical groups found in all samples of endosperm during the stress time (0,12, 24, 48 and 72 h) by accelerated ageing independently of seed vigour. bChemical group found in samples of maize embryo of lower vigor (H2_T12 and H2_T72) and cChemical group found in samples of maize embryo of high vigour (H1_T24).