Die Abhängigkeit der chemischen Zusammensetzung des Holzes einiger indischer Holzarten von seiner Lage innerhalb des Stammes

Narayanamurti, D.; Das, N. R.

doi:10.1007/bf02604959

Cited by 10 publications

(7 citation statements)

References 2 publications

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“…Results presented in the table give clear indications on the general distribution of wood extractives and the results are also in good agreement with those of Narayanamurti and Das (1955).…”

Section: Extract Contents Distribution In the Wood And Fractionationsupporting

confidence: 82%

“…Heartwood, specially outer heartwood, exhibited considerably higher amounts of volatile oils in comparison with sapwood (Narayanamurti and Das 1955). Heartwood, specially outer heartwood, exhibited considerably higher amounts of volatile oils in comparison with sapwood (Narayanamurti and Das 1955).…”

Section: A Content Of Extractivesmentioning

confidence: 92%

“…Investigations of Narayanamurti and Das (1955) gave also the distribution of extractives in the different parts of wood from stump to the top of the stem. General picture of results revealed that the highest amounts were found in outer heartwood and at the stump; in inner heartwood it was lesser and in sapwood the least.…”

Section: A Content Of Extractivesmentioning

confidence: 99%

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Studies on the Chemistry ofCedrus libaniA. Rich. - I. Wood Extractives ofCedrus libani

Hafızoğlu¹

1987

Holzforschung

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Lipophilic extractives of cedar wood were studied by gas chromatography -mass spectrometry. Extract content of the heartwood was observed to be considerably higher than that of the sapwood. The extractives comprise a monoterpene alcohol, ketones, sesquiterpene hydrocarbons, sesquiterpene alcohols, sesquiterpene ketones, diterpene hydrocarbons, fatty alcohols, phytosterols, and fatty and resin acids. Oxygenated sesquiterpenes, phytosterols and fatty acids are the main groups of components. A sesquiterpene alcohol, possibly himachalol, is the major constituent of extractives. Other important constituents dominating in the wood extractives are ß-sitosterol, oleic and linoleic acids. The presence of resin acids in cedar which does not naturally contain resin canals in the wood is of special importance in wood chemistry and forestry science.

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Section: Extract Contents Distribution In the Wood And Fractionationsupporting

confidence: 82%

Section: A Content Of Extractivesmentioning

confidence: 92%

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Studies on the Chemistry ofCedrus libaniA. Rich. - I. Wood Extractives ofCedrus libani

Hafızoğlu¹

1987

Holzforschung

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“…Narayanamurti and Das, 1955;Pettersen, 1984), with cellulose C cel consisting of 44% carbon and lignin C lig consisting of 66% carbon. As such it follows that the proportion of carbon mass of cellulose in the total wood mass is: P cel = 0.70 * 0.44 = 0.31 and the carbon mass of lignin from the total wood mass is P lig = 0.30 * 0.66 = 0.20, respectively.…”

Section: Influence Of Varying Wood Compositions In Tree-rings During mentioning

confidence: 99%

“…heartwood and sapwood and that the lignin-tocellulose ratio varies not only across one ring, i.e. in late wood as compared to early wood but also radially across the trunk (Narayanamurti and Das, 1955). Presently the different temporal intra-annual origins of photoassimilates for cellulose and lignin are ignored which may sometimes record different seasonal weather events.…”

Section: Introductionmentioning

confidence: 97%

A remarkable relationship of the stable carbon isotopic compositions of wood and cellulose in tree-rings of the tropical species Cariniana micrantha (Ducke) from Brazil

et al. 2015

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The stable isotopes of carbon were analysed in total wood and cellulose from the tree-rings of the tropical wood species Cariniana micrantha (Ducke). The aim was to examine the isotopic relationship between total wood and its cellulose over the last two and a half centuries. Although the correlation for the whole time period is very high (r = 0.96) it is remarkable that different sub-periods deviate strongly from this close relationship. Consequently, a good correlation from the subset of a longer isotopic record cannot necessarily prove its validity for the whole record. The study indicates that changes of the carbon isotopes of cellulose and of total wood show sometimes during short sub-periods different isotope patterns presumably caused by different environmental effects. Thorough calculations indicate that strong variations within the isotopic record especially changes of the isotopic level along a chronology lead to high correlations between δ 13 C wood and δ 13 C cel . Contrary thereto subsections with low isotopic variability lead to low correlations. The results imply that long term trends provide similar patterns. Therefore, if long term trends are of interest such as e.g. in climate reconstruction then total wood can be analysed in favour of cellulose, thus saving a tremendous amount of work. However, if short term aspects from a longer record are of interest, cellulose and total wood may sometimes provide different information. In addition it is hypothesized that during intervals of low isotopic variability the proportions of the various wood components may change relative to each other, leading for certain time intervals to different isotope patterns.

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Stable Isotope Signatures of Wood, its Constituents and Methods of Cellulose Extraction

et al. 2022

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In this chapter, we give some basic information on the chemical and isotopic properties of wood constituents and describe their relative contribution to the isotopic signature of wood. Based on these considerations we review studies that have compared stable isotope signals of wood with those of corresponding cellulose. We exemplify how relationships of wood-based tree-ring stable isotope sequences with climate can be affected by varying proportions of wood constituents like cellulose, lignin and extractives. A majority of benchmarking studies suggests that cellulose extraction may not be necessary. However, based upon existing research, a general statement cannot be made on the necessity of cellulose extraction. Changes in wood composition can particularly influence environmental signal strength during periods of low isotope variability. Cellulose extraction removes any effects from changing wood composition. We present the three established chemical approaches of extraction, outline how to test the purity of isolated cellulose and present user-friendly efficient experimental setups allowing to simultaneously process hundreds of samples in one batch. Further, we briefly address the analysis of stable isotopes of lignin methoxyl groups because of easy sample preparation and its potential additional value for studies on fossil wood.

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Die Abhängigkeit der chemischen Zusammensetzung des Holzes einiger indischer Holzarten von seiner Lage innerhalb des Stammes

Cited by 10 publications

References 2 publications

Studies on the Chemistry ofCedrus libaniA. Rich. - I. Wood Extractives ofCedrus libani

Studies on the Chemistry ofCedrus libaniA. Rich. - I. Wood Extractives ofCedrus libani

A remarkable relationship of the stable carbon isotopic compositions of wood and cellulose in tree-rings of the tropical species Cariniana micrantha (Ducke) from Brazil

Stable Isotope Signatures of Wood, its Constituents and Methods of Cellulose Extraction

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