NDLI: Extractives of muirapiranga (Brosimun sp.) and its effects on the vibrational properties of wood

Content Provider	Springer Nature Link
Author	Minato, Kazuya Konaka, Yuji Bremaud, Iris Suzuki, Shiro Obataya, Eiichi
Copyright Year	2009
Abstract	The potential of muirapiranga (Brosimun sp.) as a substitute material for violin bows was estimated in terms of vibrational properties, and the influence of extractives on the vibrational properties was examined. The loss tangent of muirapiranga was somewhat higher and the specific dynamic Young’s modulus was rather lower than the respective values for pernambuco, which is regarded as the best material for violin bows. Therefore, muirapiranga is a poorer bow material in terms of vibrational properties. Impregnation of crude extractives from muirapiranga decreased the loss tangent of other wood specimens. The main compounds of the extractives were identified as xanthyletin and luvangetin. Impregnations of isolated xanthyletin and commercially available methoxsalen, which was tested as an analogue of luvangetin, markedly decreased the loss tangent of other wood specimens. Methoxsalen and xanthyletin differ from conventional loss tangent-decreasing substances, namely protosappanin B and hematoxylin, in terms of water insolubility and the absence of hydroxyl groups. From the similarity in molecular characteristics of loss tangent-decreasing substances found so far, restriction of molecular motion due to an impregnated substance in the wood matrix is suggested as one loss tangent-decreasing mechanism.
Starting Page	41
Ending Page	46
Page Count	6
File Format	PDF
ISSN	14350211
Journal	Journal of Wood Science
Volume Number	56
Issue Number	1
e-ISSN	16114663
Language	English
Publisher	Springer Japan
Publisher Date	2009-09-17
Publisher Place	Japan
Access Restriction	Subscribed
Subject Keyword	Muirapiranga Vibrational property Extractive Characterization and Evaluation of Materials Materials Science Wood Science & Technology
Content Type	Text
Resource Type	Article
Subject	Biomaterials Forestry

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