The Nature Of The Chemical Constituents Of Incense Cedar Libocedrus Decurrens Torr Bark
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The Nature Of The Chemical Constituents Of Incense Cedar Libocedrus Decurrens Torr Bark
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Author : James Edward Smith
language : en
Publisher:
Release Date : 1952
The Nature Of The Chemical Constituents Of Incense Cedar Libocedrus Decurrens Torr Bark written by James Edward Smith and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1952 with Bark categories.
The purpose of this investigation was to determine the nature of the chemical constituents of incense cedar bark with the hope that such an endeavor would spur future research, development and use of a now neglected natural raw material. The bark from nine trees, which were separated into three age groups, was sampled from the bottom, middle and top sections. The age groups were 146-195 years, 261-285 years and 326-351 years. The nine samples were successively extracted with hexane, benzene, ethyl ether, hot water and 95 per cent ethanol to show the distribution and amounts of the extractives. The total extractive content varied between 13.70 per cent for the bottom sample of the oldest age group and 30.39 per cent for the top sample of the youngest age group. Similarly, the total extractive content of Port Orford cedar bark was found to range from 15.49 per cent to 25.69 per cent with the distribution corresponding closely to that of incense cedar. In both species, the greatest amount of extraneous material was removed with hot water and the variations between the total extractive content of the bottom and top samples were due primarily to the deviations in the amounts of this extract. The hexane extract was found to comprise 3.53 per cent of the ovendry unextracted bark. The components of the hexane extract and the yields based on the oven-dry weight of the hexane solubles were: volatile oil, 0.95 per cent; crystalline fatty ester, 5.83 per cent; free acids, 46.21 per cent; neutrals, 46.67 per cent; and undetermined, 0.34 per cent. Saponification of the crystalline fatty ester gave cerotic acid and an alcohol fraction equivalent to a mixture of behenyl and lignoceryl alcohols. The free acids were shown to contain 1.93 per cent resin acids, 1.11 per cent of a crystalline acid fraction equivalent to a mixture of behenic and lignoceric acids, and a fatty acid fraction, having a neutral equivalent of 435.8 and a Hanus iodine number of 41.2, which comprised 44.28 per cent of the hexane solubles. The neutral fraction contained 25.08 per cent combined acids, which had a neutral equivalent of 446.6 and a Hanus iodine number of 80.1, and 21.59 per cent unsaponifiables from which a crystalline phytosterol was isolated in a yield of 1.07 per cent of the hexane solubles. The yield of benzene soluble material was 2.46 per cent of the ovendry unextracted bark. The major components of this extract were resin acids, present in both the free and combined forms. The yield of free resin acids was 64.4 per cent of the benzene extract; the fraction melted at 181-182° C., had a neutral equivalent of 347.7 and was optically active. The combined resin acids comprised 7.8 per cent of the benzene solubles. They melted at 151-152° C., had a neutral equivalent of 358.0 and were optically active. The remainder of the benzene extract was found to contain 8.2 per cent free fatty acids, 10.8 per cent combined fatty acids and 8.2 per cent unsaponifiables. The tannin content of incense cedar bark ranged from 3.5 to 7.8 per cent, whereas that of Port Orford cedar varied between 4.2 and 7.0 per cent. These tannin yields are insufficient for economical commercial extraction. A crude carbohydrate material was obtained with hot water in a yield of approximately nine per cent of the oven-dry weight of unextracted bark. It contained 65.9 per cent reducing sugars, 24.0 per cent tannin and 10.2 per cent insolubles. The composition of the reducing sugars based on the crude carbohydrate material was: pentosans, 13.46 per cent; mannans, 3.09 per cent; galactans, 21.50 per cent; uronic anhydride, 1.87 per cent; and glucosans, 25.98 per cent. A composite sample of unextracted bark contained 14.93 per cent alcohol-benzene solubles; 3.04 per cent alcohol solubles, 7.47 per cent hot-water solubles, 37.06 per cent lignin, 36.40 per cent holocellulose, 8.51 per cent pentosans, 2.69 per cent methoxyl, 0.59 per cent acetyl, and 0.97 per cent ash.
Theses And Dissertations 1943 1959
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Author : Rodney K. Waldron
language : en
Publisher:
Release Date : 1960
Theses And Dissertations 1943 1959 written by Rodney K. Waldron and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1960 with Dissertations, Academic categories.
Bibliographic Series
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Author : Oregon. Library. Forest Research Laboratory
language : en
Publisher:
Release Date : 1960
Bibliographic Series written by Oregon. Library. Forest Research Laboratory and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1960 with Bibliography categories.
Bibliographic Series
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Author :
language : en
Publisher:
Release Date : 1957
Bibliographic Series written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1957 with Oregon categories.
Technical Association Of The Pulp And Paper Industry
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Author :
language : en
Publisher:
Release Date : 1965
Technical Association Of The Pulp And Paper Industry written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1965 with Paper industry categories.
Forestry Theses Accepted By Colleges And Universities In The United States
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Author :
language : en
Publisher:
Release Date : 1953
Forestry Theses Accepted By Colleges And Universities In The United States written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1953 with Dissertations, Academic categories.
Incense Cedar
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Author : Alexander Dunlop Lindsay
language : en
Publisher:
Release Date : 1932
Incense Cedar written by Alexander Dunlop Lindsay and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1932 with Incense cedar categories.
Technical Section Proceedings
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Author : Canadian Pulp and Paper Association. Technical Section
language : en
Publisher:
Release Date : 1966
Technical Section Proceedings written by Canadian Pulp and Paper Association. Technical Section and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1966 with Paper industry categories.
Annual meeting held after the end of the calendar year covered by the proceedings.
Bibliography Of Agriculture
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Author :
language : en
Publisher:
Release Date : 1975
Bibliography Of Agriculture written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975 with Agriculture categories.
The Poisoned Weed
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Author : Donald G. Crosby
language : en
Publisher: Oxford University Press
Release Date : 2004-04-01
The Poisoned Weed written by Donald G. Crosby and has been published by Oxford University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004-04-01 with Medical categories.
Over-two thirds of the U.S. population is allergic to poison oak, poison ivy, or a related plant. These and many other common plants in our homes, fields, and gardens are irritants that cause misery to many. But surprisingly, there has never been a general guide to help raise awareness of them--and to help avoid them. This new book reviews the history, occurrence, classification, toxicity, and health aspects of all the major allergenic and irritant species.