Analysis of Odor-Active Compounds from Pinus massoniana as Materials in Landscape Design Based on GC-MS-O Technology
[Objective]Identifying the compositions and odor characteristics of odor-active compounds emissions from Pinus massoniana woods,and analyzing sources and release mechanisms will be helpful to provide guidance for the construction of the odor database and scientific utilization of Pinus massoniana woods as materials in landscape design.[Method]Emission characteristics of odor-active compounds from heartwoods and sapwoods with different moisture contents were researched via gas chromatography-mass spectrometry-olfactometry in this paper.[Result]In total,25 substances were successfully identified.The main odorants were α-pinene(dense pine wood),camphene(mint,pungent),limonene(fresh,lemon),longifolene(cooling)and(+)-cycloisosativene(fresh).The main components of odor compounds from Pinus massoniana woods were terpenoids,alcohols,hydrocarbons and aldehydes.Terpenoids accounted for 90.99％-96.58％of the total odorants,followed by alcohols and hydrocarbons.The odour attributes of Pinus massoniana timbers were mainly mint-camphor,fresh floral and woody aromas,accompanied by fruity and sweet fragrance,and occasionally presented a weak of almond and leather-mixture aroma.With the decrease of moisture content,the total mass concentrations and odor intensities firstly increased and then decreased.The species,concentrations and intensities of odor-active compounds from sapwoods were higher than those from heartwoods.For example,when the moisture content was 30％,concentrations and intensities of odor-active compounds from sapwoods were 6.76 times and 1.77 times of those from heartwoods,respectively.Terpenoids,alcohols,hydrocarbons and aldehydes also existed in sapwoods,whereas only terpenoids and hydrocarbons were detected stably in heartwoods,occasionally followed by a few of alcohols emissions.The concentration of compound monomer was correlated with wood moisture content,and the result for the same substance was different due to the diversity of heartwood and sapwood.In general,there was a positive correlation between the concentration and odor intensity of the same compound monomer,which was related to compound specie,wood location and wood moisture content.[Conclusion]The odour attributes were mainly mint-camphor,fresh floral and woody aromas,modified by fruit and sweet smell,which had relax and happy effect on psychological feeling.Therefore,as the important landscape material,Pinus massoniana wood has a positive effect on the use's mental and physical health,and is proper for use in most urban parks,children's parks,and healing landscapes.
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