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R. Lehmann · SciRah

Researcher profile · Semantic Scholar

R. Lehmann

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R. Lehmann — researcher profile on SciRah

h-index: 24
Works: 60
Citations: 1,455

Most-cited papers

Steroidal saponins from the roots of Asparagus racemosus.
P. Hayes, A. H. Jahidin, R. Lehmann, K. Penman +2 more
2008Phytochemistry127 citations
Semantic Scholar
Permeability studies of alkylamides and caffeic acid conjugates from echinacea using a Caco‐2 cell monolayer model
A. Matthias, J. Blanchfield, K. Penman, I. Toth +3 more
2004Journal of Clinical Pharmacy and Therapeutics96 citations Open access
Semantic Scholar
Echinacea alkamide disposition and pharmacokinetics in humans after tablet ingestion.
A. Matthias, R. Addison, K. Penman, R. Dickinson +2 more
2005Life Science88 citations
Semantic Scholar
Investigations into the antibacterial activities of phytotherapeutics against Helicobacter pylori and Campylobacter jejuni
C. Cwikla, K. Schmidt, A. Matthias, K. Bone +2 more
2010Phytotherapy Research86 citations Open access
Semantic Scholar
Structural revision of shatavarins I and IV, the major components from the roots of Asparagus racemosus
P. Hayes, A. H. Jahidin, R. Lehmann, K. Penman +2 more
200677 citations
Semantic Scholar
Echinacea alkylamides modulate induced immune responses in T-cells.
A. Matthias, L. Banbury, K. Bone, D. Leach +1 more
2008Fitoterapia76 citations
Semantic Scholar
Alkylamides from Echinacea Modulate Induced Immune Responses in Macrophages
A. Matthias, L. Banbury, L. Stevenson, K. M. Bone +2 more
2007Immunological Investigations67 citations
Semantic Scholar
Steroidal saponins from the roots of Trillium erectum (Beth root).
P. Hayes, R. Lehmann, K. Penman, W. Kitching +1 more
2009Phytochemistry58 citations
Semantic Scholar
Asparinins, asparosides, curillins, curillosides and shavatarins: structural clarification with the isolation of shatavarin V, a new steroidal saponin from the root of Asparagus racemosus
P. Hayes, A. H. Jahidin, R. Lehmann, K. Penman +2 more
200657 citations
Semantic Scholar
Pharmacognosy and chemotypes of passionflower (Passiflora incarnata L.).
H. Wohlmuth, K. Penman, T. Pearson, R. Lehmann
2010Biological and Pharmaceutical Bulletin56 citations Open access
Semantic Scholar
Cytotoxic activity of polyacetylenes and polyenes isolated from roots of Echinacea pallida
Andrea Chicca, F. Pellati, B. Adinolfi, A. Matthias +7 more
2008British Journal of Pharmacology54 citations Open access
Semantic Scholar
Pharmacokinetic and pharmacodynamic interactions of echinacea and policosanol with warfarin in healthy subjects.
M. I. M. Abdul, Xuemin Jiang, K. Williams, R. Day +6 more
2010British Journal of Clinical Pharmacology49 citations Open access
Semantic Scholar
Bilberry adulteration using the food dye amaranth.
K. Penman, C. W. Halstead, A. Matthias, J. D. De Voss +3 more
2006Journal of Agricultural and Food Chemistry43 citations
Semantic Scholar
Cytochrome P450 enzyme-mediated degradation of Echinacea alkylamides in human liver microsomes.
A. Matthias, E. M. Gillam, K. Penman, N. J. Matovic +3 more
2005Chemico-Biological Interactions42 citations
Semantic Scholar
Steroidal saponins from the roots of Smilax sp.: structure and bioactivity.
Victoria L. Challinor, P. Parsons, Sonet Chap, Eve F. White +3 more
2012Steroids41 citations
Semantic Scholar
Modulation of macrophage immune responses by Echinacea
L. Stevenson, A. Matthias, L. Banbury, K. Penman +3 more
2005Molecules40 citations Open access
Semantic Scholar
Sodium paeoniflorin sulfonate, a process derived artefact from paeoniflorin
P. Hayes, R. Lehmann, K. Penman, W. Kitching +1 more
200538 citations
Semantic Scholar
Investigations into the Antiadhesive Activity of Herbal Extracts Against Campylobacter jejuni
K. Bensch, Joe Tiralongo, K. Schmidt, A. Matthias +3 more
2011Phytotherapy Research36 citations
Semantic Scholar
Polyunsaturated alkyl amides from Echinacea: synthesis of diynes, enynes, and dienes.
Nicholas J. Matovic, P. Hayes, K. Penman, R. Lehmann +1 more
2011Journal of Organic Chemistry33 citations
Semantic Scholar
Bioavailability of Echinacea Constituents: Caco-2 Monolayers and Pharmacokinetics of the Alkylamides and Caffeic Acid Conjugates
A. Matthias, K. Penman, Nicholas J. Matovic, K. Bone +2 more
2005Molecules33 citations Open access
Semantic Scholar
Stereoselective synthesis, natural occurrence and CB(2) receptor binding affinities of alkylamides from herbal medicines such as Echinacea sp.
Nicholas J. Matovic, A. Matthias, J. Gertsch, Stefan Raduner +3 more
2007Organic and biomolecular chemistry32 citations
Semantic Scholar
Echinacea intake induces an immune response through altered expression of leucocyte hsp70, increased white cell counts and improved erythrocyte antioxidant defences
L. Agnew, S. P. Guffogg, A. Matthias, R. Lehmann +2 more
2005Journal of Clinical Pharmacy and Therapeutics32 citations Open access
Semantic Scholar
Comparison of Echinacea alkylamide pharmacokinetics between liquid and tablet preparations.
A. Matthias, R. Addison, L. Agnew, K. M. Bone +2 more
2007Phytomedicine30 citations
Semantic Scholar
Complete 1H and 13C assignments of the four major saponins from Dioscorea villosa (wild yam)
P. Hayes, Lynette K. Lambert, R. Lehmann, K. Penman +2 more
2007Magnetic resonance in chemistry : MRC24 citations
Semantic Scholar
Caco-2 Monolayer Permeability and Stability of Chamaelirium luteum (False Unicorn) Open-Chain Steroidal Saponins
Tegan P. Stockdale, Victoria L. Challinor, R. Lehmann, J. D. De Voss +1 more
2019ACS Omega19 citations Open access
Semantic Scholar
Structure and bioactivity of steroidal saponins isolated from the roots of Chamaelirium luteum (false unicorn).
Victoria L. Challinor, Julia M. U. Stuthe, P. Parsons, Lynette K. Lambert +3 more
2012Journal of Natural Products16 citations
Semantic Scholar
Revision of the absolute configurations of bethosides B and C and their aglycone.
Victoria L. Challinor, P. Hayes, P. Bernhardt, W. Kitching +2 more
2011Journal of Organic Chemistry14 citations
Semantic Scholar
The truth about false unicorn (Chamaelirium luteum): total synthesis of 23R,24S-chiograsterol B defines the structure and stereochemistry of the major saponins from this medicinal herb.
Nicholas J. Matovic, Julia M. U. Stuthe, Victoria L. Challinor, P. Bernhardt +3 more
2011Chemistry13 citations
Semantic Scholar
Metabolism of the major Echinacea alkylamide N‐isobutyldodeca‐2E,4E,8Z,10Z‐tetraenamide by human recombinant cytochrome P450 enzymes and human liver microsomes
F. Toselli, A. Matthias, K. Bone, E. M. Gillam +1 more
2010Phytotherapy Research13 citations Open access
Semantic Scholar
Structure and absolute configuration of helosides A and B, new saponins from Chamaelirium luteum.
Victoria L. Challinor, Julia M. U. Stuthe, P. Bernhardt, R. Lehmann +2 more
2011Journal of Natural Products12 citations
Semantic Scholar
Structure and absolute configuration of methyl (3R)-malonyl-(13S)-hydroxycheilanth-17-en-19-oate, a sesterterpene derivative from the roots of Aletris farinosa.
Victoria L. Challinor, Sonet Chap, R. Lehmann, P. Bernhardt +1 more
2013Journal of Natural Products11 citations
Semantic Scholar
Permeability studies of Kavalactones using a Caco‐2 cell monolayer model
A. Matthias, J. Blanchfield, K. Penman, K. M. Bone +2 more
2007Journal of Clinical Pharmacy and Therapeutics11 citations Open access
Semantic Scholar
Biosynthetic insights provided by unusual sesterterpenes from the medicinal herb Aletris farinosa
Victoria L. Challinor, Ryne C. Johnston, P. V. Bernhardt, R. Lehmann +2 more
2015Chemical Science10 citations Open access
Semantic Scholar
RP-HPLC detection of a sulphiting-induced artefact from paeoniflorin in dried roots of Paeonia lactiflora.
P. Hayes, R. Lehmann, K. Penman, K. Bone +2 more
2006Phytochemical Analysis10 citations
Semantic Scholar
Acute immune modulatory effects of bioavailable Echinacea alkamides
A. Matthias, P. Connellan, D. Thompson, K. Bone +1 more
20084 citations
Semantic Scholar
Asparinins, Asparosides, Curillins, Curillosides and Shavatarins: Structural Clarification with the Isolation of Shatavarin V, a New Steroidal Saponin from the Root of Asparagus racemosus.
P. Hayes, A. H. Jahidin, R. Lehmann, K. Penman +2 more
20073 citations
Semantic Scholar
Comparison of alkamide pharmacokinetics between equivalent liquid and tablet echinacea preparations
R. Lehmann, A. Matthias, K. Watson, K. Bone
20063 citations
Semantic Scholar
Authentication of skullcap (Scutellaria lateriflora L.) – a commonly adulterated medicinal plant
H. Wohlmuth, B. Aulton, K. Penman, R. Lehmann +1 more
20092 citations
Semantic Scholar
Bioavailability of Echinacea alkamides in human breast milk
A. Matthias, H. Merika, R. Addison, K. Bone +1 more
20082 citations
Semantic Scholar
Enhanced antioxidant effect of a herbal-nutrient complex including ascorbic acid and Polygonum cuspidatum extract(containing resveratrol)
C. Andrews, A. Matthias, L. Agnew, N. B. Reinke +3 more
20072 citations
Semantic Scholar
Fringe Tree (Chionanthus virginicus L.) Stem Bark Offers a Sustainable Alternative to Root Bark
K. Penman, K. Bone, R. Lehmann
20081 citations
Semantic Scholar
Metabolism of Echinacea alkamides by human recombinant P450 enzymes
F. Toselli, A. Matthias, K. Bone, E. M. Gillam +1 more
20081 citations
Semantic Scholar
NMR studies found that a commercially supplied standard reference purported to be Withanolide D was instead Withanolide A
K. Penman, K. Bone, P. Hayes, J. D. De Voss +6 more
20071 citations
Semantic Scholar
Anti-adhesive Activity of Herbal Extracts Against Campylobacter jejuni
K. Bensch, J. Tiralongo, A. Matthias, K. Bone +2 more
20100 citations
Semantic Scholar
Effects of echinacea supplementation on alkylamide pharmacokinetics
L. Agnew, R. Addison, A. Matthias, K. Bone +2 more
20100 citations
Semantic Scholar
Echinacea induced hsp70 alterations in leukocytes
L. Agnew, A. Matthias, C. Shipp, K. Kauter +3 more
20100 citations
Semantic Scholar
Investigations into the antibacterial activities of herbal medicines against Helicobacter pylori and Campylobacter jejuni
C. Cwikla, K. Schmidt, A. Matthias, K. Bone +2 more
20080 citations
Semantic Scholar
Echinacea in Health: Risks and Benefits
A. Matthias, R. Lehmann, K. Bone
20080 citations
Semantic Scholar
Cytotoxic effects of polyacetylenes from E. pallida on human cancer cell lines and their bioavailability through Caco-2 cell monolayers
A. Chicca, F. Pellati, A. Matthias, B. Adinolfi +4 more
20070 citations Open access
Semantic Scholar
Swertisin chemotype of passionflower (Passiflora incarnata L.)
H. Wohlmuth, K. Penman, T. Pearson, R. Lehmann
20070 citations
Semantic Scholar

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A. Matthias×28
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K. Bone×22
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K. Penman×21
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J. D. De Voss×16
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W. Kitching — researcher profile on SciRah

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Victoria L. Challinor×8

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A. H. Jahidin — researcher profile on SciRah