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Antioxidant activity of chitooligosaccharides upon two biological systems: Eryt...
Fernandes, João C.; Eaton, Peter; Nascimento, Henrique; Gião, Maria S.; Ramos, Óscar S.; Belo, Luís; Santos-Silva, Alice; Pintado, Manuela E.Most of the reports to date on the antioxidant capacity of chitosans and chitooligosaccharides (COS) are based on strictly chemical methods. When studying antioxidants with potential in vivo applications, the method used to evaluate the antioxidant activity should be representative of the conditions in which the antioxidant might have a protective effect. In this work we evaluate the antioxidant activity of two...
Study of the antibacterial effects of chitosans on bacillus cereus (and its spo...
Fernandes, João C.; Eaton, Peter; Gomes, Ana M.; Pintado, Manuela E.; Malcata, F. XavierBacillus cereus is a Gram-positive, spore-forming bacterium that is widely distributed in nature. Its intrinsic thermal resistance coupled with the extraordinary resistance against common food preservation techniques makes it one of the most frequent food-poisoning microorganisms causing both intoxications and infections. In order to control B. cereus growth/sporulation, and hence minimize the aforementioned ha...
Atomic force microscopy study of the antibacterial effects of chitosans on Esch...
Eaton, Peter; Fernandes, João C.; Pereira, Eulália; Pintado, Manuela E.; Malcata, F. XavierChitosan has been reported to be a non-toxic, biodegradable antibacterial agent. The aim of this work was to elucidate the relationship between the molecular weight of chitosan and its antimicrobial activity upon two model microorganisms, one Gram-positive (Staphylococcus aureus) and one Gramnegative (Escherichia coli). Atomic force microscopy (AFM) imaging was used to obtain high-resolution images of the effec...
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