Zobrazeno 1 - 10
of 28
pro vyhledávání: '"Jyrki Loponen"'
Autor:
Karel D. Klika, Ammar Saleem, Jari Sinkkonen, Marja Kähkönen, Jyrki Loponen, Petri Tähtinen, Kalevi Pihlaja
Publikováno v:
ARKIVOC, Vol 2004, Iss 7, Pp 83-105 (2004)
Externí odkaz:
https://doaj.org/article/af6d4765b0ce4a3e971af687bf52c6d4
Publikováno v:
Journal of Chemical Ecology. 34:57-64
In ecological studies, phlorotannins have conventionally been quantified as a group with similar functionality. Since this group consists of oligo- and polymers, the quantification of their pooled contents alone may not sufficiently describe the vari
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4cb3142ff219621270b383e9b13e6417
https://doi.org/10.1007/s10886-007-9410-2
https://doi.org/10.1007/s10886-007-9410-2
Publikováno v:
Biology and Fertility of Soils. 44:547-556
The aim of this study was to monitor the concentration of some plant secondary metabolites, such as low- and high-molecular-weight phenolics, condensed tannins (proanthocyanidins), and sesqui-, di- and triterpenes, in litter (L), fermentation (F) and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b03300d530990bce389326f37bef3952
https://doi.org/10.1007/s00374-007-0234-6
https://doi.org/10.1007/s00374-007-0234-6
Publikováno v:
Phytochemical Analysis. 18:378-386
Mountain birch leaves contain large amounts of structurally variable polymeric proanthocyanidins. Their isolation procedure was enhanced by the addition of liquid–liquid extractions prior to column chromatography over Sephadex LH-20. Isolated polym
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e84dc1d46d3c49ddcfabc1517e8353c6
https://doi.org/10.1002/pca.992
https://doi.org/10.1002/pca.992
Publikováno v:
Soil Biology and Biochemistry. 38:1364-1374
Tannins are polyphenolic compounds that may influence litter decomposition, humus formation, nutrient (especially N) cycling and ultimately, plant nutrition and growth. The aim of this study was to determine the response of C and N transformations in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::41ec79d4332ea04d25dee18e6cf02a8a
https://doi.org/10.1016/j.soilbio.2005.10.013
https://doi.org/10.1016/j.soilbio.2005.10.013
Autor:
Jyrki Loponen, Kalevi Pihlaja, Hideyuki Matsumura, Yoshihisa Kohno, Lauri Kapari, Maarit Karonen, Svetlana Ossipova, Yasuko Sakai, Vladimir Ossipov, Chikako Mikami, Takeshi Izuta
Publikováno v:
Journal of Chemical Ecology. 32:1445-1458
Proanthocyanidins (PAs) or condensed tannins are a major group of phenolic compounds in the leaves of birch trees and many other woody and herbaceous plants. These compounds constitute a significant allocation of carbon in leaves and are involved in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::82b1e9626ecc56e16812986ff3d76906
https://doi.org/10.1007/s10886-006-9061-8
https://doi.org/10.1007/s10886-006-9061-8
Publikováno v:
Soil Biology and Biochemistry. 37:1309-1318
The aim of this study was to compare the effects of silver birch (Betula pendula Roth) and Norway spruce (Picea abies (L.) Karst.) on soil C and N transformations and on the characteristics of organic matter. Soil samples were taken from the humus la
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::be8a68430f34f3fd3d20f1648c944981
https://doi.org/10.1016/j.soilbio.2004.12.002
https://doi.org/10.1016/j.soilbio.2004.12.002
Publikováno v:
Analytica Chimica Acta. 522:105-112
Three procyanidin fractions, one with shorter oligomers, one with longer oligomers and one with polymers, were obtained from Pinus sylvestris L. bark extract. Procyanidins were analyzed using reversed-phase and normal-phase high-performance liquid ch
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::46e8d6b6b8092e95af5ccb0f0569b771
https://doi.org/10.1016/j.aca.2004.06.041
https://doi.org/10.1016/j.aca.2004.06.041
Autor:
Petri Tähtinen, Jyrki Loponen, Marja P Kähkönen, Kalevi Pihlaja, Jari Sinkkonen, Karel D. Klika, Ammar Saleem
Publikováno v:
ARKIVOC, Vol 2004, Iss 7, Pp 83-105 (2004)
Tri-O-galloyl-2,4-chebuloyl-β-D-glucopyranoside (chebulinic acid, 1) and its novel thrice- hydrolyzed derivative, 2,4-chebuloyl-β-D-glucopyranoside (galloyl-free chebulinic acid, 2), together with ellagic (3) and gallic acids (4), ethyl gallate (5)
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2cdd04458a5e1f74fcd4e371303345f0
https://www.arkat-usa.org/arkivoc-journal/browse-arkivoc/ark.5550190.0005.708
https://www.arkat-usa.org/arkivoc-journal/browse-arkivoc/ark.5550190.0005.708
Publikováno v:
European Food Research and Technology. 214:505-510
Four cultivars of red beetroot (Beta vulgaris) were evaluated with respect to their betalain and phenolic contents. The compounds were analysed using HPLC and identified by HPLC-DAD, HPLC-ESI-MS and NMR techniques. Betalains (vulgaxanthins I and II,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7c9f99f41c96765f2dd45e4e1e1e299c
https://doi.org/10.1007/s00217-001-0478-6
https://doi.org/10.1007/s00217-001-0478-6