Total protein was 6.5%[8]. Two chitinases, designated RRC-A and RRC-B, were isolated from radish roots. Both compounds had a molecular weight of 25 kDa[9]. N-Bromosuccinimide and di-Etpyrocarbonate inhibited the activities of both chitinases.
Arabinogalactan proteins (AGPs) were isolated from primary and mature roots of the radish. These were composed mainly of L-arabinose and D-galactose. Structures of the carbohydrate moieties of the root were essentially similar to those isolated from seeds and mature leaves in that they consisted of consecutive (1→3)-linked β-D-galactosyl backbone chains having side chains (1→6)-linked β-Dgalactosyl residues, to which α-L-arabinofuranosyl residues were attached in the outer regions. One prominent feature of the primary root AGPs was that they contained appreciable amounts of L-fucose[10].