Figure 2.

Composition of building block units in amylopectin. (a) The size distribution of building blocks from mung bean cotyledon amylopectin was determined by HPAEC-PAD and obtained by α-amylolysis and successive β-amylolysis. Groups of building blocks and DP of the peaks are indicated. Group 1 contains Glc, maltose and maltotriose, Groups 2–6 are branched dextrins, of which individual peaks of Groups 5 and 6 are not resolved by HPAEC. (b) The relative number of branched building blocks of the respective groups. The PAD response was calibrated to quantitative amounts for each DP. (c) The principal structures of the branched building blocks with A- or B-chains indicated for groups 2 and 3. Group 5 contains building blocks with 5–7 chains and group 6 has ≥8 chains. The multitude of possible structures of building blocks increases rapidly with the number of chains. Red lines between the building blocks symbolize the inter-block segments.