Microstructural characterization of chitosan and alginate films by microscopy techniques and texture image analysis

Physical evaluation of biodegradable films of calcium alginate plasticized with polyols

“…The SEM micrographs in Figure 4 revealed similar structures for all three types of film, confirming the astonishing transformation that took place during the immersion in the crosslinking solution during the 2 nd Stage. The crystals were washed out and the M-film, like the G-film and the X-film became more compact with a slightly striated cross section, typical of a strong film (Arzate-Vázquez et al, 2012). The Glass Transition Temperatures, T g , of the alginate pre-films and the calcium crosslinked films plasticized with glycerol, xylitol and mannitol, obtained by thermomechanical analyses, are given in Table 5.…”

Fotonic and Electron Microscopy Images for Quality Evaluation of Delignification of Agave Fibers

“…tics of GL, AF (area fraction) and E for cellulose and lig can be related with the intensity of fluorescence, while ity of the fluorescence and consequently with lignin or ce F kinetics an increment on the cellulose fluorescence inte on time were observed ( Figures 5A and 5B) indicating a h ibers, while the lignin fluorescence, as measured by GL s the reaction time proceeds; thus indicating a major delig e, image entropy, which is associated with the homogen 89 with rela-LC: . ased ssognin AF ellunsihigh and gnineity of the gray level of the images, [11,14] can be linked to fluorescence saturation of the images, as observed in Figure 5C, where the entropy values for cellulose decreased with the reaction time, while entropy values for lignin increased, indicating the elimination of lignin and the purification of cellulose on the fibers. This agreed with previous works, where has been assumed that the fluorescence of lignified materials is mainly attributable to the lignin content and its intensity is directly proportional with its concentration [3].…”

Physico-chemical, mechanical and electrical performance of bael fruit gum–chitosan IPN films

“…However, due to its solubility in the acidic pH of stomach, endeavors are aimed at derivatizing or crosslinking it for modifying drug release characteristics (Risbud, Hardikar, Bhat, & Bhonde, 2000;Sivakumar, Manjubala, & Panduranga, 2002). Attempts have been made to co-process various polysaccharides like chondroitin (Bhise, Dhumal, Chauhan, Paradkar, & Kadam, 2007), sodium citrate (Chen, Moschakis, & Nelson, 2004), sodium alginate (Arzate-Vázquez et al, 2012) with chitosan in order to modify the film forming ability of the former polymers. These films have been investigated for improving drug delivery in colo-rectal drug release dosage forms (Naidu et al, 2009), sustained release drug delivery systems (Kumar, Muzzarelli, Muzzarelli, Sashiwa, & Domb, 2004) and transdermal film formulations (Sivakumar et al, 2002).…”