Download Natural Products of Woody Plants: Chemicals Extraneous to by W. E. Hillis (auth.), John W. Rowe (eds.) PDF

By W. E. Hillis (auth.), John W. Rowe (eds.)

Wood as present in timber and trees used to be of basic significance to historical people of their fight to regulate their atmosphere. next evolution throughout the Bronze and Iron a long time as much as our current technologically complicated society has hardly ever lowered the significance of wooden. this present day, its function as a resource of paper items, furnishings, construction fabrics, and gasoline continues to be of significant importance. wooden comprises a mix of polymers, also known as lignocellulose. The cellulose micro fibrils encompass an immensely powerful, linear polymer of glucose. they're linked to smaller, extra complicated polymers composed of assorted sugars known as hemicelluloses. those polysaccharides are embedded in an amorphous phenylpropane polymer, lignin, making a remarkably robust com­ posite constitution, the lignocellulosic mobilephone wall. wooden additionally comprises fabrics which are mostly extraneous to this lignocellulosic mobilephone wall. those extracellular components can variety from below 1070 to approximately 35% of the dry weight of the wooden, however the ordinary variety is two% -10%. between those elements are the mineral ingredients, salts of calcium, potassium, sodium, and different metals, quite these found in the soil the place the tree is starting to be. many of the extraneous parts of wooden are too insoluble to be ex­ tracted by means of inert solvents and stay to provide extractive-free wooden its colour; quite often those are high-molecular-weight polyphenolics.

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Extra resources for Natural Products of Woody Plants: Chemicals Extraneous to the Lignocellulosic Cell Wall

Example text

In 1924 surveys conducted by the New Zealand government indicated that there were sufficient resources to meet global demands for well over 100 years. However, its replacement by synthetic resins resulted in only 228 kg being exported in 1982. Kauri provided the basis for high-quality varnishes, and the lower-quality grades were used for the manufacture of linoleum together with pine rosin. Manila resins [sometimes called copal (5)] have been obtained by tapping the bark of Agathis alba (Araucariaceae) growing in Indonesia, the Philippines, and New Guinea, and have been used in recent times.

Paul Karrer Gold Medal, University of Zurich (1986). Alcon Award in Ophthalmology (1986). Research Achievement, American Society of Pharmacognosy (1985). Remsen Award, American Chemical Society (1981). Centenary Medal, British Chemical Society (1979). Chemical Society of Japan Award (1979). Ernst Gunther Award, American Chemical Society (1978). Research interests include isolation and structural and bioorganic studies of bioactive compounds; retinal proteins; spectroscopy. WILLIAM R. NES (deceased, 1989) W.

Kauri provided the basis for high-quality varnishes, and the lower-quality grades were used for the manufacture of linoleum together with pine rosin. Manila resins [sometimes called copal (5)] have been obtained by tapping the bark of Agathis alba (Araucariaceae) growing in Indonesia, the Philippines, and New Guinea, and have been used in recent times. Mastic and sandarac, which are soluble in alcohol, were formerly used as varnishes, particularly in the Middle Ages, for the protection of oil and watercolor paintings or for coating metals.

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