Table 39.
Reduction in the total content of total glycoalkaloids (TGA) in S. tuberosum tubers as a result of peeling (as part of a commercial or experimental processing)
| Studya | Peeling method | Number of cultivars | Analytical method | TGA initial content in unpeeled tuber (mg/kg) | TGA content in peeled tuber (mg/kg) | Reduction in TGA content (%) |
|---|---|---|---|---|---|---|
| Sizer et al. (1980) | Hand peeling (1–2 mm)b | 1 | Non‐aqueous titration | 42.3 (fw) | 23.7 (fw) | 44% |
| Hellenäs et al. (1995) | Manual peelingb | 1 | HPLC‐UV | Cultivar ‘Magnum Bonum’: 336 (fw) | 243 (fw) | 30% |
| Panovská et al. (1997) | Manual peelingb | 7 | HPLC‐UV | 178 (fw) Mean of 7 cultivars | 82 (fw) Mean of 7 cultivars | 54% Mean of 7 cultivars |
| Ostrý et al. (2010) | Hand peeling (1 mm)b | 3d | HPTLC |
56–215 (fw) Across cultivars |
47–177 (fw) Across cultivars |
44% Across cultivars |
| Rytel et al. (2018) | Manual peelingb | 2 (coloured‐fleshed) | HPLC‐UV |
Cultivar ‘Valfi’: 269 (dw) ‘Blaue Elise’: 238 (dw) |
Cultivar ‘Valfi’: 97 (dw) ‘Blaue Elise’: 63 (dw) |
69% Mean of 2 cultivars |
| Rytel et al. (2005) | n.r. (taken from a French fries production line)c | 2 | HPLC‐UV |
Cultivar ‘Santana’: 209 (dw)e ‘Innowator’: 186 (dw)e |
Cultivar ‘Santana’: 127 (dw)e ‘Innowator’: 141 (dw)e |
32% Mean of 2 cultivars |
| Pęksa et al. (2006) | n.r. (taken from a chip processing line)c | 2 | HPLC‐UV |
Cultivar ‘Karlena’: 129 (dw) ‘Saturna’: 165 (dw) |
Cultivar ‘Karlena’: 101 (dw) ‘Saturna’: 118 (dw) |
25% Mean of 2 cultivars |
| Tajner‐Czopek et al. (2008) | n.r. | 3 | HPLC‐UV |
17.4 (fw) Mean of 3 cultivars |
7,4 (fw) Mean of 3 cultivars |
58% Mean of 3 cultivars |
| Mäder et al. (2009) | Steam‐peelingc | 1 | HPTLC | 294 (dw)f | 67 (dw)f | 77% |
| Tajner‐Czopek et al. (2012) | n.r. | 2 (coloured‐fleshed) | HPLC‐UV |
Cultivar ‘Rosalinde’: 248 (dw)e ‘Blue Congo’: 274 (dw)e |
Cultivar ‘Rosalinde’: 199 (dw)e ‘Blue Congo’: 219 (dw)e |
20% Mean of 2 cultivars |
| Rytel (2012a) | Laboratory carborundum peelerc | 1 | HPLC‐UV |
254 (dw) Mean of 4 batches |
175 (dw) Mean of 4 batches |
31% Mean of 4 batches |
| Rytel (2012b) | Steam‐peelingc | 1 | HPLC‐UV | 160 (dw)f | 81 (dw)f | 50% |
| Rytel (2012c) | Laboratory carborundum peelerc | 3 | HPLC‐UV |
225 (dw) Mean of 3 cultivars |
147 (dw) Mean of 3 cultivars |
35% Mean of 3 cultivars |
| Rytel (2013) | Laboratory carborundum peelerc | 1 | HPLC‐UV |
249 (dw)f Mean of 2 batches |
169 (dw)f Mean of 2 batches |
32% Mean of 2 batches |
| Rytel et al. (2013) | n.r. | 4 (coloured‐fleshed | HPLC‐UV |
250 (dw) Mean of 4 cultivars |
69 (dw) Mean of 4 cultivars |
72% Mean of 4 cultivars |
| Tajner‐Czopek et al. (2014) | Mechanical peelerc | 4 (coloured‐fleshed) | HPLC‐UV |
50 (fw) Mean of 4 cultivars |
25 (fw) Mean of 4 cultivars |
50% Mean of 4 cultivars |
| Rytel et al. (2015) | Carborundum peeler and manual selectionc | 3 | HPLC‐UV |
282 (dw) Mean of 3 cultivars |
196 (dw) Mean of 3 cultivars |
31% Mean of 3 cultivars |
TGA: total glycoalkaloids; dw: dry weight; fw: fresh weight; n.r.: not reported; LC: liquid chromatography; UV: ultraviolet; MS: mass spectrometry; MS/MS: tandem MS; HR: high resolution; HP: high performance; HPTLC: high‐performance thin layer chromatography.
Study year is in this case the year of publication.
Househod‐like peeling.
Industrial‐like peeling.
A total of 20 samples was tested.
Results were presented in figures, for α‐solanine and α‐chaconine.
Results were presented for α‐solanine and α‐chaconine.