title: Singlet oxygen generation enhanced by silver-pectin nanoparticles.
abstract: We demonstrate the potential application of silver-pectin nanoparticles on photodynamic therapy, on a solution-base platform. Photodynamic therapy is a medical technique which uses a combination of photosensitizing drugs and light to induce selective damage on the target tissue, by electronically excited and highly reactive singlet state of oxygen. Metal enhanced singlet oxygen generation in riboflavin water solution with silver-pectin nanoparticles was observed and quantified. Here 13 nm silver nanospheres enclosed by a pectin layer were synthesized and it interaction with riboflavin molecule was analyzed. Pectin, a complex carbohydrate found in plants primary cell walls, was used to increase the biocompatibility of the silver nanoparticles and to improve metal enhanced singlet oxygen generation (28.5 %) and metal-enhanced fluorescence (30.7 %) processes at room temperature. The singlet oxygen sensor fluorescent green reagent was used to quantify the enhancement of the riboflavin singlet oxygen production induced by the silver colloid. We report a 1.7-fold increase of riboflavin emission and a 1.8-fold enhancement of singlet oxygen production.
authors: Center for Natural and Exact Sciences, Federal University of Pernambuco, Cidade Universitária, Recife, PE, Brazil.
authors: Luciana S A
authors: LS
authors: de Melo
authors: Anderson S L
authors: AS
authors: Gomes
authors: Sybele
authors: S
authors: Saska
authors: Karina
authors: K
authors: Nigoghossian
authors: Younes
authors: Y
authors: Messaddeq
authors: Sidney J L
authors: SJ
authors: Ribeiro
authors: Renato E
authors: RE
authors: de Araujo
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D010368:Pectins / Q000737:chemistry*; D010778:Photochemotherapy; D017319:Photosensitizing Agents / Q000737:chemistry / Q000494:pharmacology*; D012256:Riboflavin / Q000737:chemistry / Q000494:pharmacology; D012834:Silver / Q000737:chemistry*; D026082:Singlet Oxygen / Q000378:metabolism*; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet
chemical_list: D001672:Biocompatible Materials; D017319:Photosensitizing Agents; D026082:Singlet Oxygen; D012834:Silver; D010368:Pectins; D012256:Riboflavin