np5b00916_si_001.pdf (412.7 kB)
Terpenoid Oligomers of Dammar Resin
journal contribution
posted on 2016-03-16, 17:09 authored by Ilaria Bonaduce, Francesca Di Girolamo, Iacopo Corsi, Ilaria Degano, Maria
Rosaria Tinè, Maria
Perla ColombiniDammar is a triterpenoid resin containing
a volatile fraction,
a monomeric fraction, and a high-molecular weight fraction. Although
the low-molecular-weight components comprising sesquiterpenoids and
triterpenoids have been extensively studied, the nature of the macromolecular
components is still not fully understood, and different and sometimes
contradictory theories have been proposed. The aim of this paper is
to clarify the nature of the macromolecular components of dammar resin.
A multianalytical approach was adopted based on thermoanalytical–thermogravimetric
analysis (TGA), and thermogravimetric analysis coupled with Fourier
transform infrared spectroscopy (TGA/FTIR)and mass spectrometric
techniques–direct exposure mass spectrometry (DE/MS), pyrolysis
coupled to gas chromatography and mass spectrometry (Py/GC/MS), flow
injection analysis electrospray ionization mass spectrometry (FIA/ESI/MS),
and gas chromatography/mass spectrometry (GC/MS). The data indicate
that the oligomeric fraction comprises triterpenoids bound through
ester bonds, and that these triterpenoids are the same as those found
in the free terpenoid fraction. The oligomeric fraction also includes
triterpenoids containing carbonyl moieties, such as formyl groups,
thus suggesting that these are involved in the esters in their corresponding
enolic form.