| |{{:2-isobutyl-3-methoxypyrazine.jpg|2-isobutyl-3-methoxypyrazine}} \\ 2-isobutyl-3-methoxypyrazine \\ /(green bell pepper)// |{{:pyrazine_2meo3isopropyl.png|2-isopropyl-3-methoxypyrazine}} \\ 2-isopropyl-3-methoxypyrazine \\ //(green pea earthy)// |{{geosmin.jpg|geosmin}} \\ (-)-geosmin \\ //(earth-like)// | | |{{:2-isobutyl-3-methoxypyrazine.jpg|2-isobutyl-3-methoxypyrazine}} \\ 2-isobutyl-3-methoxypyrazine \\ //(green bell pepper)// |{{:pyrazine_2meo3isopropyl.png|2-isopropyl-3-methoxypyrazine}} \\ 2-isopropyl-3-methoxypyrazine \\ //(green pea earthy)// |{{geosmin.jpg|geosmin}} \\ (-)-geosmin \\ //(earth-like)// | |
| Headspace samples revealed that potent odorants of raw spinach are (Z)-3-hexenal, methanethiol, (Z)-1,5-octadien-3-one, dimethyl trisulphide, octanal, 2-isopropyl- and 2-sec-butyl-3-methoxypyrazine. Boiled spinach contained dimethyl sulphide, methanethiol, dimethyl trisulphide, methional and 2-acetyl-1-pyrroline as the most important odorants. After drying and storage of raw spinach, methylpropanal, 2- and 3-methylbutanal and propanal were identified as the odorants with higher odour activity values. (Z)-1,5-octadien-3-one and methional, in a concentration ratio of about 1 : 100, are responsible for the fishy off-flavour of dry spinach stored at lower temperatures under nitrogen. A hay-like flavour was caused by oxidative degradation of furan fatty acids, yielding 3-methyl-2,4-nonanedione. \\ | Headspace samples revealed that potent odorants of raw spinach are (Z)-3-hexenal, methanethiol, (Z)-1,5-octadien-3-one, dimethyl trisulphide, octanal, 2-isopropyl- and 2-sec-butyl-3-methoxypyrazine. Boiled spinach contained dimethyl sulphide, methanethiol, dimethyl trisulphide, methional and 2-acetyl-1-pyrroline as the most important odorants. After drying and storage of raw spinach, methylpropanal, 2- and 3-methylbutanal and propanal were identified as the odorants with higher odour activity values. (Z)-1,5-octadien-3-one and methional, in a concentration ratio of about 1 : 100, are responsible for the fishy off-flavour of dry spinach stored at lower temperatures under nitrogen. A hay-like flavour was caused by oxidative degradation of furan fatty acids, yielding 3-methyl-2,4-nonanedione. \\ |
