Table 1. Linkage composition of the fractions (F1-F7) yielded by size-exclusion chromatography on Biogel P2 of the product mixture obtained from the incubation of 0.6% (w v−1) amylose V with 25 μg ml−1 of L. fermentum NCC 2970 GtfB.
Sample | DP | Chemical shift (%)a |
Methylation analysis (%)b |
||||
---|---|---|---|---|---|---|---|
(α1 → 4) | (α1 → 3) | Glcp (1 → | →3)-Glcp-(1 → | →4)-Glcp-(1 → | →3,4)-Glcp-(1 → | ||
F1 | >30 | 60 | 40 | 6 | 28 | 58 | 8 |
F2 | ~8–20 | 71 | 29 | 12 | 21 | 61 | 6 |
F3 | ~6–8 | 80 | 20 | 14 | 15 | 66 | 5 |
F4 | ~5–6 | 88 | 12 | 21 | 10 | 67 | 2 |
F5 | ~4–5 | 89 | 11 | 21 | 10 | 64 | 5 |
F6 | ~3 | 100 | 0 | ND | ND | ND | ND |
F7 | ~2 | 100 | 0 | ND | ND | ND | ND |
aThe data represent the ratios of integration of the peak areas of the (α1 → 4) linkage signal at 5.41 ppm and the (α1 → 3) linkage signal at 5.37 ppm in the 1H NMR spectra.
bThe linkage distribution data are shown in molar percentages based on GLC intensities.