Table 2.
Folate content (μg ± SD 100 g−1) in dried faba beans during conventional industrial canning
| Fresh weight |
Dry weight |
|||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Processing step | DM | H4folate | 5-CH3–H4folate | 10-HCO–PteGlu | 5-HCO–H4folate | Sum as PteGlu ± SD | H4Folate | 5-CH3–H4folate | 10-HCO–PteGlu | 5-HCO–H4-folate | Sum as PteGlu ± SD | % relative content as PteGlu (DM)1 |
| Raw | 91 ± 0.1 | 18 ± 0.5 | 61 ± 6.4 | 10 ± 0.6 | 61 ± 4.1 | 142 ± 10 | 20 ± 0.6 | 67 ± 7.1 | 11 ± 0.7 | 67 ± 4.5 | 157 ± 6.9B | 100 |
| Soaked | 47 ± 1.1 | 10 ± 0.4 | 44 ± 1.7 | 2 ± 0.1 | 32 ± 2.7 | 85 ± 4.1 | 21 ± 0.9 | 95 ± 3.6 | 5 ± 0.2 | 70 ± 5.7 | 181 ± 8.8A | 115 |
| Blanched | 44 ± 0.3 | 5 ± 0.2 | 45 ± 2.3 | 3 ± 0.3 | 27 ± 2.9 | 76 ± 0.5 | 10 ± 0.5 | 103 ± 3.7 | 6 ± 0.8 | 60 ± 3.8 | 171 ± 1.2A,B | 109 |
| Autoclaved | 27 ± 0.2 | 3 ± 0.6 | 18 ± 1.6 | 1 ± 0.1 | 14 ± 2.2 | 35 ± 3.5 | 12 ± 2.1 | 68 ± 6.0 | 5 ± 0.5 | 51 ± 8.2 | 129 ± 12.8C | 81 |
| Canning medium2 | 2 ± 0.2 | 14 ± 1.7 | 3 ± 0.4 | 3 ± 0.9 | 21 ± 1.5 | |||||||
Individual folate values are means of duplicate trials and duplicate analyses (n = 2). The sum of folates was calculated from individual folate forms using the conversion factors 445.4 for tetrahydrofolate (H4folate), 459.5 for 5-methyl-tetrahydrofolate (5-CH3–H4folate), 469.4 for 10-formyl folic acid (10-HCO–PteGlu), and 473.5 for 5-formyl-tetrahydrofolate (5-HCO–H4folate). Different superscripts within the same column represent significant differences (P < 0.05). DM, dry matter.
1
The relative content was calculated for the sum of PteGlu on dry weight basis.
2
Drained weight of beans was 290 ± 5 g and of canning medium 100 ± 5 g.