title: Langmuir-Blodgett films of a novel cellulose derivative with dihydrophytyl group: the ability to anchor beta-carotene molecules.
abstract: A novel cellulose derivative, 6-O-dihydrophytylcellulose (DHPC), was first synthesized via a ring-opening polymerization and allowed to self-assemble onto an air-water interface. Langmuir-Blodgett (LB) films were characterized with atomic force microscope (AFM), UV-vis spectroscopy, and Fourier transform infrared spectroscopy. The surface pressure-area (pi-A) isotherms for DHPC and beta-carotene (betaC) mixture indicated strong interaction between these compounds to pack well. Thus, DHPC has the ability to anchor betaC in the monolayer. It was proved that a betaC-DHPC monolayer was transferred successfully onto a substrate, yielding Y-type LB films by UV spectroscopic analysis. The transmission and reflection-absorption IR spectra (RAS) indicated that the dihydrophytyl chains had almost trans-zigzag conformation and were oriented nearly perpendicular to the substrate. AFM section analysis revealed the thickness per layer to be 2.32 nm. Consequently, DHPC was found to be an appropriate matrix to fabricate the mixed LB films containing betaC.
authors.affiliation: Division of Forest and Biomaterials Science, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan. k_sakaki@kais.kyoto-u.ac.jp
authors.forename: Keita
authors.initials: K
authors.lastname: Sakakibara
authors.forename: Shinsuke
authors.initials: S
authors.lastname: Ifuku
authors.forename: Yoshinobu
authors.initials: Y
authors.lastname: Tsujii
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kamitakahara
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Takano
authors.forename: Fumiaki
authors.initials: F
authors.lastname: Nakatsubo
mesh_terms: D002236:Carbohydrate Conformation; D002482:Cellulose / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000737:chemistry*; D008567:Membranes, Artificial; D018625:Microscopy, Atomic Force / Q000379:methods; D010836:Phytol / Q000031:analogs & derivatives* / Q000737:chemistry; D012680:Sensitivity and Specificity; D013499:Surface Properties; D019207:beta Carotene / Q000737:chemistry*
chemical_list: C512886:6-O-dihydrophytylcellulose; D008567:Membranes, Artificial; D019207:beta Carotene; D010836:Phytol; C045825:3,7,11,15-tetramethyl-1-hexadecanol; D002482:Cellulose