title: Markers, Reactions, and Interactions during the Aging of Pinus Resin Assessed by Raman Spectroscopy.
abstract: The resin extracted from the species of the Pinus genus (Pinaceae family) is a widely used material. Primarily, resins are made up of two types of diterpenoids: abietanes and pimaranes. Their composition changes with aging, affecting their chemical and physical properties; however, the chemical changes that occur during aging are not yet fully known. Understanding the evolution of pimaranes and abietanes and the chemical composition of the aged resins is essential to make the most of this substance and of its derivatives. A systematic study of the aging of Pinus resin with Raman complemented with infrared (IR) spectroscopy was carried out. This study provided new information about the interactions among the constituting molecules in resins aged over many years. In particular the formation of intermolecular hydrogen bonds in aged samples was detected for the first time, and the formation of acid anhydrides from the reaction between pimaranes was demonstrated. Furthermore, Raman and IR spectra band assignments are proposed, and the specific markers of the main compounds of the resin are tagged. This will facilitate the qualitative analysis of resin compounds.
authors.affiliation: Department Enginyeria Química, EPSEVG, Universitat Politècnica de Catalunya , Avinguda Víctor Balaguer s/n, 08800 Vilanova i la Geltrú, Barcelona, Spain.
authors.forename: Victoria
authors.initials: V
authors.lastname: Beltran
authors.affiliation: Department Enginyeria Química, EPSEVG, Universitat Politècnica de Catalunya , Avinguda Víctor Balaguer s/n, 08800 Vilanova i la Geltrú, Barcelona, Spain.
authors.forename: Nati
authors.identifier: 0000-0003-2266-2390
authors.initials: N
authors.lastname: Salvadó
authors.affiliation: Department Enginyeria Química, EPSEVG, Universitat Politècnica de Catalunya , Avinguda Víctor Balaguer s/n, 08800 Vilanova i la Geltrú, Barcelona, Spain.
authors.forename: Salvador
authors.initials: S
authors.lastname: Butí
authors.affiliation: Diamond Light Source , Harwell Campus, Chilton-Didcot OX11 0DE Oxon, U.K.
authors.forename: Gianfelice
authors.initials: G
authors.lastname: Cinque
authors.affiliation: Department Física, Universitat Politècnica de Catalunya , Campus del Baix Llobregat, c. Esteve Terradas 8, 08860 Castelldefels, Barcelona, Spain.
authors.forename: Trinitat
authors.initials: T
authors.lastname: Pradell
mesh_terms: D000375:Aging; D004224:Diterpenes / Q000737:chemistry* / Q000302:isolation & purification* / Q000378:metabolism; D015394:Molecular Structure; D028223:Pinus / Q000737:chemistry*; D012116:Resins, Plant / Q000032:analysis / Q000737:chemistry* / Q000378:metabolism; D013055:Spectrophotometry, Infrared; D013059:Spectrum Analysis, Raman
chemical_list: D004224:Diterpenes; D012116:Resins, Plant