Pectin Rhamnogalacturonan II: On the “Small Stem with Four Branches” in the Primary Cell Walls of Plants

Figure 2

Size-exclusion chromatographic (SEC) fractionations of dialyzed Endo-PG-II-digested presaponified cold water-extracted pectins (WEPs), cold-potassium-oxalate extracted pectins (OEPs), hot dilute (0.05 M) hydrochloric-acid-extracted pectins(HEPs), and cold dilute (0.05 M) sodium-hydroxide-extracted pectins (OHEPs) from citrus peel CWM, showing in molecular weight decreasing order; rhamnogalacturonan I (fraction I), rhamnogalacturonan II dimer (fraction II₁) and/or monomer (fraction II₂), and oligogalacturonide (fraction III) populations. Neutral sugars (∘); uronic acids (●).

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