Capillary gas chromatography‐mass spectrometry of resin acids in tall oil rosin

Abstract

The resin acid composition of Finnish tall oil rosin was investigated by gas chromatography and mass spectrometry employing open tubular capillary columns. On a column coated with 1,4-butanediol succinate, 16 resin acids found in tall oil rosin samples were well resolved, and mass spectra could be recorded. All resin acids were confirmed to be of the pimaric and abietic types by gas chromatographymass spectrometry. Eight of the acids were not detected in the corresponding crude tall oils and evidently had been formed during the technical distillation process. The presence of 8,15-pimaradien-18-oic and 8,15-isopimaradien-18-oic acids in the rosin, but not in the crude tall oil, indicates that the pimanc type acids also undergo extensive isomerization during tall oil distillation. Additionally, three dihydroabietic acids and two acids with identical mass spectra, tentatively stereoisomers of 7,9(11)abietadien-18-oic acid, were formed during the distillation process.

Pyrolysis of Tall Oil-Derived Fatty and Resin Acid Mixtures

“…The composition of resin acids in TOR differed significantly from that in CTO, indicating various decomposition and isomerisation reactions during distillation [24]. For this reason, the amount of unidentified peaks (mainly various resin acid derivatives) was also relatively high (about 10% of the total peak areas, Table 1).…”

Studies on the Chemistry ofCedrus libaniA. Rich. - I. Wood Extractives ofCedrus libani

“…A wide ränge of data available in the literature, both GC and MS, were utilized for the determination of the composition of acidic fraction (Bardyshev and Bulgakov 1975;Bruun and Gasland 1960;Ekman 1979aEkman , 1980Ekman and Pensar 1971, 1973a, 1973bHafizoglu 1979;Holmbom 1977;Holmbom and Avela 1971a;Holmbom, Avela, and Pekkala 1974;Zeman and Scharmann 1972;Zinkel and Engler 1977;Zinkel, Zank, and Wesolowski 1971). The composition of acidic fraction was not found to differ considerably from those of pine and spruce (Assarsson and Äkerlund 1966;Hafizoglu 1983;Holmbom and Ekman 1978).…”

Colophony: Rosin in Unmodified and Modified Form

“…The neutral compounds in rosin are mainly diterpenoid alcohols and aldehydes and also hydrocarbons. Tall oil rosin also contains small amounts of fatty acids and alcohols (Holmbom et al 1974;Zinkel 1975;Soltes and Zinkel 1989). The major resin acid is abietic acid.…”