title: Multifunctional nanogels with dual temperature and pH responsiveness.
abstract: Over the last 10 years, the development of intelligent biomaterials for medical and pharmaceutical applications has attracted growing interest by combining interdisciplinary efforts. Between them nanogels represent one of the most attractive carriers for innovative drug delivery systems. In the present investigation new variants of multi-responsive nanogels have been synthesized by crosslinking poly(itaconic anhydride-co-3,9-divinyl-2,4,8,10-tetraoxaspiro [5.5] undecane) copolymer (having different molar ratios between comonomers) with 1,12-dodecandiol. The new structures were obtained by using modification of itaconic anhydride moieties in the copolymer. This is a convenient method for the preparation of a network with increased functionality, which further may ensure new strategies for coupling various bioactive compounds, especially owing to the behavior of the used copolymers, which present dual pH and temperature sensitive characteristics. The chemical structure of the new compounds was confirmed by FTIR and1H RMN spectra. Also, the evaluation of thermal stability by thermogravimetric analysis sustains the covalent bonds occurring between the copolymer and diol. The dual responsiveness of the nanogel structures to temperature and pH was put into evidence by DLS studies. This feature can be used for the development of drug delivery systems, which can mimic biological response behavior to a certain extent. The new synthesized nanogels were tested as drug delivery systems by using diclofenac as a model drug. The results obtained from in vitro and in vivo investigation confirm the bioactivity of the nanogel networks.
authors.affiliation: "PETRU PONI" Institute of Macromolecular Chemistry Grigore Ghica Voda Alley 41A, RO - 700487 Iasi, Romania.
authors.forename: Loredana Elena
authors.initials: LE
authors.lastname: Nita
authors.affiliation: "PETRU PONI" Institute of Macromolecular Chemistry Grigore Ghica Voda Alley 41A, RO - 700487 Iasi, Romania. Electronic address: achiriac1@yahoo.com.
authors.forename: Aurica P
authors.initials: AP
authors.lastname: Chiriac
authors.affiliation: "PETRU PONI" Institute of Macromolecular Chemistry Grigore Ghica Voda Alley 41A, RO - 700487 Iasi, Romania.
authors.forename: Alina
authors.initials: A
authors.lastname: Diaconu
authors.affiliation: "PETRU PONI" Institute of Macromolecular Chemistry Grigore Ghica Voda Alley 41A, RO - 700487 Iasi, Romania.
authors.forename: Nita
authors.initials: N
authors.lastname: Tudorachi
authors.affiliation: "Gr .T. Popa" University of Medicine and Pharmacy University Street 16, 700115 Iasi, Romania.
authors.forename: Liliana
authors.initials: L
authors.lastname: Mititelu-Tartau
mesh_terms: D000473:Alkanes / Q000737:chemistry; D001672:Biocompatible Materials / Q000737:chemistry; D004337:Drug Carriers / Q000737:chemistry; D016503:Drug Delivery Systems / Q000379:methods; D006863:Hydrogen-Ion Concentration; D000080385:Nanogels; D011092:Polyethylene Glycols / Q000737:chemistry*; D011094:Polyethyleneimine / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry; D013696:Temperature
chemical_list: D000473:Alkanes; D001672:Biocompatible Materials; D004337:Drug Carriers; D000080385:Nanogels; D011108:Polymers; C413692:polyethylene glycol polyethyleneimine nanogel; D011092:Polyethylene Glycols; D011094:Polyethyleneimine; C022884:undecane
keywords: 1,12-Dodecandiol; Dual responsiveness; In vitro and in vivo tests; Nanogel network; Poly(itaconic anhydride-co-3,9-divinyl-2,4,8,10-tetraoxaspiro[5.5] undecane)