A glass slide was dip-coated in 15% w/v maltodextrin solutions and dried at 80 °C in a convection oven for 15 h to obtain smooth surfaces of maltodextrins DE6 and DE21. Droplets of deionized water were then deposited onto the surfaces at 25 °C and the contact angle formed between the droplet and the material was determined using image analysis; essentially the boundary formed by the droplet is recognized and the contour is approximated to obtain the contact angle from
the slope of this curve where it intersects the baseline (Fig. 14 insert). A contact angle less than 90° is said to indicate “wetting behavior”, and a contact angle greater than 90° indicates “non-wetting behavior” [12]. Results from the measurements are shown in Fig. 14.