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Scientia Silvae Sinicae ›› 2023, Vol. 59 ›› Issue (11): 103-117.doi: 10.11707/j.1001-7488.LYKX20220166

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VOCs Composition and Odor Characteristics of Main Plantation Wood in China

Lihua Qi,Xianwu Zou*,Bin Lü,Yuejin Fu,Lina Tang,Liming Zhu,Qian Chen,Bo Liu,Botao Li   

  1. National Center of Inspection and Testing for Wood-Based Panels and Wood-Bamboo Products Research Institute of Wood Industry, Chinese Academy of Forestry Beijing 100091
  • Received:2022-03-23 Online:2023-11-25 Published:2023-12-08
  • Contact: Xianwu Zou

Abstract:

Objective: In order to screen suitable wood raw materials for the production of low odor wooden household materials, and to provide the treatment object and basis, the volatile organic compounds(VOCs) composition and odor substance characteristics of main plantation wood in China were studied and determined in this paper. Method: The VOCs compositions of bark/heart wood/sapwood of five main plantations in China, including Populus cathayana, Eucalyptus sp., Cunninghamia lanceolata, Pinus massoniana and Cinnamomum camphora, were analyzed qualitatively and quantitatively by headspace solid phase microextraction (HS-SPME) combined with gas chromatography-mass spectrometry (GC-MS). At the same time, the odor types and odor intensity of main odor substances in each part of wood were characterized according to the combined sniffing instrument Result: The VOCs components of Populus cathayana, Eucalyptus sp., Cunninghamia lanceolata, Pinus massoniana and Cinnamomum camphora include terpenes, alcohols, ketones, acids, aldehydes, esters, phenols and furan heterocyclic compounds. VOCs are mainly distributed in the heart wood/sapwood of Cinnamomum camphora, Pinus massoniana, and in the heart wood of Cunninghamia lanceolata and Eucalyptus sp. Linalool and safrole are the specific and rich components in Cinnamomum camphora. α-pinene riched in pine heart wood/sapwood also exists in a small amount in Cinnamomum camphora. α-cedrene and β-cadinene are the two largest components in heart wood of Cunninghamia lanceolata. Correspondingly, δ-cadinene and α-muurolene are the two largest components in heart wood of Eucalyptus sp. In addition to a small amount of salicylaldehyde, benzaldehyde and furan components in the bark, the VOCs content in the heart wood/sapwood of Populus cathayana is very small. Wood odor mainly comes from terpenes, alcohols, ketones, aldehydes and esters in wood VOCs. Linalool, safrole, eugenol and β-caryophyllene are the main odor characteristic substance of Cinnamomum camphora. In Pinus massoniana, α-pinene is rich and had the typical aroma of rosin and turpentine. However, the odour intensity of β-caryophyllene, with lower mass concentration, is equal to that of α-pinene. The odor substances in cunninghamia lanceolata and Eucalyptus sp. are concentrated in their heart wood, and the odor intensity of α-muurolene is the highest. Furthermore, the same VOC component shows different odor characteristic when its content is different. And different people have different senses when smelling the same wood, including Eucalyptus sp., Cunninghamia lanceolata, Pinus massoniana and Cinnamomum camphora. Conclusion: The sapwood of Eucalyptus sp., Cunninghamia lanceolata, and the heart wood/sapwood of Populus cathayana are the best choice for the preparation of low total volatile organic compounds (TVOC) and low odor wooden household products.

Key words: plantation wood, volatile organic compounds, odor, GCMS-olfactory analysis

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