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Table 8 Functional groups and chemical bonds of polysaccharides from 6 jujube species

From: A method for tracing the six geographical indication (GI) jujube species by crude polysaccharide characterization

Functional groups or chemical bonds by IR

ZBP

ZJP

ZTP

ZHP

ZYP

ZMP

Typical absorption peaks of polysaccharides (3200–3600 cm−1)

√

√

√

√

√

√

Existence of a sugar ring (2920–2935 cm−1)

√

√

√

√

√

√

Existence of uronic acid (C=O stretching vibration and O–H bending vibration) (1500–1740 cm−1 and 1050–1260 cm−1)

√

√

√

√

√

√

Bound water (1635–1640 cm−1)

√

√

√

√

√

√

C–H bending vibration (1455–1460 cm−1)

√

√

√

 × 

 × 

√

C=O symmetric stretching vibration (1335–1340 cm−1)

√

√

√

√

√

√

C–O stretching vibration (1070–1450 cm−1)

√

√

√

√

√

√

Existence of a pyranose sugar (910–920 cm−1)

√

√

√

√

√

√

β-Configuration of pyranose sugar units (864–900 cm−1)

√

√

√

√

√

√