Volatile Organic Compounds Analysis Of22Garden Plants And Analytic Hierarchy Process Evaluation

In order to investigate the constituents and compounds of volatile organic compounds (VOCs) from differernt families and genera garden plants and provide a theorotic basis for landscape design, we collected VOCs from21woody plants and flowers of4woody plants(22garden plants in total) in Jiangsu and Zhejiang area under natural state using dynamic headspace air-circulation method, and identified the main constituents and compounds with thermal desorption system gas chromatography/mass spectrometer (TDS-GC-MS) technique, meanwhile using Analytic Hierarchy Process (AHP) to establish a evaluation system based on plant VOCs. The main results were as follows:1. Differences in plants and organs make the variances in the composition of VOCs. The flowers mainly release alcohols, terpenes, esters and alkanes, such as3,7-dimethyl-1-octanol, ocimene,(Z)-3-Hexen-1-ol, acetate and1-Tridecene, among which3,7-dimethyl-1-octanol covers a great part. Leaves mainly release terpenes, aldehydes and alcohols, such as a-Pinene, decanal and (Z)-3-hexene-ol, among which decanal accounts for a higher proportion.2. Seven species contain Cedrus deodara, Sabina chinensis, Podocarpus macrophyllus, Liquidambar formosana, Erythrina crista-galli, Acer cinnamomifolium, Jasminum mesnyi with a higher relative compounds in terpenes, in which a-pinene,D-limonene and ocimene accounting a large proportion, Loropetalum chinense, Acer palmatum, Acer ginnala, Acer buergerianum, Acer yanjuechi, Acer pubinerve, Acer davidii, Forsythia viridissima, Osmanthus fragrans, Ligustrum lucidum, Ligustrum sinense with a higher relative compounds esters, plants with higher alcohol relative compounds are Alibizia julibrissin, Acer davidii, mainly release (Z)-2-hexene-1-ol,2-etheyl-1-hexanol.3. Three needles mainly release terpenoid compounds, relative compounds respectively are75.07%,76.17%and35.14%. Whereas18broaleaf release complex compounds containing alcohols, aldehydes and esters etc. Some broaleaf plants release more aromatic compounds and aliphatic hydrocarbons, such as aldehydes in Loropetalum chinense (33.42%), alcohol in Sophora japonica (49.28%), esters in Osmanthus fragrans (69.67%), terpenoids relatively lower in others, such as Albizia julibrissin (14.48%), Sophora japonica (7.51%), Osmanthus fragrans (4.90%).4. Terpenoids released from flowers of Albizia julibrissin and Wisteria sinensis were higher, respectively58.50%and67.69%, including ocimene and trans-ocimene, alcohols in Sophora japonica and Sophora japonica var. pendula relatively were higher(41.87%and31.69%), such as7-Tetradecanol,3,7-dimethyl-l-octanlo, esters in Wisteria sinensis is relatively high, such as (Z)-3-Hexen-1-ol, acetate (15.54%).5. Plant VOCs released from22landscape plants were evaluated using AHP method. Reasult indicating that VOCs released from leaves of21species and flowers of4species all have a high value to health. Leaves scores from individual plant ranking as, Sabina chinensis, Liquidambar formosana, Cedrus deodara, Acer cinnamomifolium, Acer yanjuechi, Jasminum mesnyi, Acer pubinerve, Podocarpus macrophyllus, Acer davidii, Acer buergerianum, Erythrina crista-galli, Ligustrum lucidum, Ligustrum sinense, Acer palmatum, Albizia julibrissin, Forsythia viridissima, Loropetalum chinense, Acer ginnala, Sophora japonica var. pendula, Sophora japonica, Osmanthus fragrans. Flowers as Albizia julibrissin, Wisteria sinensis, Sophora japonica, Sophora japonica var. pendula. The AHP evaluation illuminate that plants which release higher terpenes, alcohols and esters will contribute to ecological construction and human’s health.