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Table 6 Comparative summary of monosaccharides in the onion epidermal wall (mol%)

From: Saccharide analysis of onion outer epidermal walls

Column HPAEC-PAD   GC/MS  
A B C D   E F G
mTFA/S Chl + mTFA/S Dri + mTFA/S Chl/Dris + mTFA/S Average TMS Methyl alditols Col E&F MERGED
Glc 25 35 17 20 24 2 44 23
GalA/GlcA 49 43 58 58 52 75 7 51
Gal 14 11 14 12 12 17 27 14
Xyl 5 5 4 4 5 3 9 5
Rha 3 2 3 2 2 1 3 2
Ara 2 2 3 2 2 1 4 2
Fuc 1 1 1 1 1
Man 2 2 2 2 2 2 6 3
Total 100 100 100 100 100 100 100 100
  1. mol%, determined using 'total µg/mg' values for each experiment. Column G merges the GalA/GlcA µg/mg amount with the methyl alditol amounts. mTFA/S, methanolysis followed by TFA and Saeman’s hydrolysis; Chl + mTFA/S, chloroform pretreated peel, methanolysis followed by TFA and Saeman’s hydrolysis; Dri + mTFA/S, Driselase digested, methanolysis followed by TFA and Saeman's hydrolysis; Chl/Dri + mTFA/S, chloroform pretreat, Driselase digested, methanolysis followed by TFA and Saeman’s hydrolysis