Lipophilic Extractives in Heartwood of European Larch (Larix decidua Mill.)

Zule, Janja; Čufar, Katarina; Tišler, Vesna

doi:10.5552/drind.2015.1442

Cited by 8 publications

(15 citation statements)

References 10 publications

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“…and to determine their variability in longitudinal direction within a tree and between two trees selected for analyses. This article is the continuation of the previously published work (Zule et al, 2015), where lipophilic extractive compounds of the same samples were characterized.…”

Section: Introduction 1 Uvodmentioning

confidence: 74%

“…The most signifi cant fi nding in the case of larch heartwood was that chemical structure of hydrophilic extractive fraction changed towards the top of both examined trees, which was not the case with lipophilic fraction of the same tissues (Zule et al, 2015). While the fl avonoids taxifolin and dihydrokaempferol predominated in the majority of heartwood, lignans appeared at the top in abundant concentrations with secoisolariciresinol as the main phenolic compound.…”

Section: Determination Of the Composition Of Ethanol Extracts Relatedmentioning

confidence: 97%

“…About 5 g of each freezedried powdered sample was weighed into a metal extraction cell and sequentially extracted fi rst with hexane (V-50 ml) to remove lipophilic fraction (Zule et al, 2015) and afterwards with 95 % ethanol (V-50 ml) to isolate hydrophilic extractive portion. The temperature of the fi rst extraction step was 90 ºC, pressure 13.8 MPa and extraction time 10 minutes (2 static cycles with static time of 5 minutes).…”

Section: Extraction 23 Ekstrakcijamentioning

confidence: 99%

“…In contrast to lipophilic compounds in resin canals and parenchyma cells of sapwood (Zule et al, 2015), they mainly originate from the transition zone between heartwood and sapwood. Their concentrations are the highest at the boundary, after which they gradually decrease in radial direction towards the pith.…”

Section: Introduction 1 Uvodmentioning

confidence: 99%

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Hydrophilic Extractives in Heartwood of European Larch (Larix decidua Mill.)

Zule¹,

Čufar

Tišler

2017

Drvna ind.

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• The heartwood of two European larch trees was examined for the content of hydrophilic extractives. Ethanol was used as a solvent for extractions of adequately pretreated samples, while gas chromatography with fl ame ionisation detection (GC-FID), gas chromatography coupled to mass spectrometry (GC-MS SAŽETAK • U radu su prikazani rezultati istraživanja hidrofi lnih ekstraktivnih tvari u srži dvaju stabala europskog ariša. Kao otapalo za ekstrakciju prethodno adekvatno obrađenih uzoraka upotrijebljen je etanol, a za kemijske analize primijenjene su plinska kromatografi ja s plameno-ionizacijskim detektorom (GC-FID), plinska kromatografi ja povezana s masenom spektrometrijom (GC-MS) i tekućinska kromatografi ja visoke djelotvornosti (HPLC-SEC). U uzorcima su identifi cirani i kvantitativno procijenjeni različiti fenolni spojevi kao što su fl avonoidi i lignani. Taksifolin i dihidrokamferol najzastupljeniji su

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Section: Introduction 1 Uvodmentioning

confidence: 74%

Section: Determination Of the Composition Of Ethanol Extracts Relatedmentioning

confidence: 97%

Section: Extraction 23 Ekstrakcijamentioning

confidence: 99%

Section: Introduction 1 Uvodmentioning

confidence: 99%

See 2 more Smart Citations

Hydrophilic Extractives in Heartwood of European Larch (Larix decidua Mill.)

Zule¹,

Čufar

Tišler

2017

Drvna ind.

Self Cite

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“…The genus Larix species (larch) are an important European resource for durable wood (Hillis, 1987). The extractives in larch belong to the molecular families of terpenoids, flavonoids, lignans, fatty acids, and galactans (Zule et al, 2015;Zule et al, 2017). Like all conifers, larch trees contain high amounts of oleoresin, produced by specialized epithelial cells surrounding resin canals and ray parenchyma cells.…”

Section: Introductionmentioning

confidence: 99%

Understanding the Formation of Heartwood in Larch Using Synchrotron Infrared Imaging Combined With Multivariate Analysis and Atomic Force Microscope Infrared Spectroscopy

et al. 2020

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Formation of extractive-rich heartwood is a process in live trees that make them and the wood obtained from them more resistant to fungal degradation. Despite the importance of this natural mechanism, little is known about the deposition pathways and cellular level distribution of extractives. Here we follow heartwood formation in Larix gmelinii var. Japonica by use of synchrotron infrared images analyzed by the unmixing method Multivariate Curve Resolution-Alternating Least Squares (MCR-ALS). A subset of the specimens was also analyzed using atomic force microscopy infrared spectroscopy. The main spectral changes observed in the transition zone when going from sapwood to heartwood was a decrease in the intensity of a peak at approximately 1660 cm-1 and an increase in a peak at approximately 1640 cm-1. There are several possible interpretations of this observation. One possibility that is supported by the MCR-ALS unmixing is that heartwood formation in larch is a type II or Juglans-type of heartwood formation, where phenolic precursors to extractives accumulate in the sapwood rays. They are then oxidized and/or condensed in the transition zone and spread to the neighboring cells in the heartwood.

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