2. Material and methods
2.1. Materials
Agarose 6B beads were from Amersham Biosciences. Soluble starch potato, dinitrosalicylicacid, sodium periodate, sodium bohohydride were from Sigma-Aldrich.Ethylendiamine was from Fluka, and glutaraldehyde 25% was from Vetec. The sweet
potatoes used were obtained at the local market.