@article{LettauWarsinkeKatterleetal.2006,
  author    = {Lettau, Kristian and Warsinke, Axel and Katterle, Martin and Danielsson, Bengt and Scheller, Frieder W.},
  title     = {A bifunctional molecularly imprinted polymer (MIP): analysis of binding and catalysis by a thermistor},
  doi       = {10.1002/anie.200601796},
  year      = {2006},
  abstract  = {Binding or catalysis? Both can be distinguished with a molecularly imprinted polymer (MIP) by the different patterns of heat generation. The catalytically active sites, like in the corresponding enzyme, generate a steady-state temperature increase. Thus, enzyme-like catalysis and antibody-analogue binding are analyzed simultaneously in a bifunctional MIP for the first time (see scheme).},
  language  = {en}
}
@article{LettauGajovicEichelmannKwaketal.2004,
  author    = {Lettau, Kristian and Gajovic-Eichelmann, N. and Kwak, Young-Keun and Scheller, Frieder W. and Warsinke, Axel},
  title     = {Hydroxylasen und katalytische Polymere f{\"u}r Biochips},
  year      = {2004},
  language  = {de}
}
@article{SchellerTiepnerWarsinke2004,
  author    = {Scheller, Frieder W. and Tiepner, K. and Warsinke, Axel},
  title     = {Anwendung von Biosensoren in der Lebensmittelanalytik},
  isbn      = {3-89947-120-2},
  year      = {2004},
  language  = {de}
}
@article{LiuWollenbergerHalameketal.2005,
  author    = {Liu, Songqin and Wollenberger, Ursula and Halamek, Jan and Leupold, Eik and St{\"o}cklein, Walter F. M. and Warsinke, Axel and Scheller, Frieder W.},
  title     = {Affinity interaction betwen phenylboronic acid-carrying self-assembled monolayers and FAD or HRP},
  year      = {2005},
  abstract  = {A method is provided for the recognition of glycated molecules based on their binding affinities to boronate- carrying monolayers. The affinity interaction of flavin adenine dinucleotide (FAD) and horseradish peroxidase (HRP) with phenylboronic acid monolayers on gold was investigated by using voltammetric and microgravimetric methods. Conjugates of 3-aminopherrylboronic acid and 3,3'-dithiodipropionic acid di(N-hydroxysuccinimide ester) or 11-mercaptoundecanoic acid were prepared and self-assembled on gold surfaces to generate monolayers. FAD is bound to this modified sur-face and recognized by a pair of redox peaks with a formal potential of -0.433 V in a 0.1 m phosphate buffer solution, pH 6.5. Upon addition of a sugar to the buffer, the bound FAD could be replaced, indicating that the binding is reversible. Voltammetric, mass measurements, and photometric activity assays show that the HRP can also be bound to the interface. This binding is reversible, and HRP can be replaced by sorbitol or removed in acidic solution. The effects of pH, incubation time, and concentration of H2O2 were studied by comparing the catalytic reduction of H2O2 in the presence of the electron-donor thionine. The catalytic current of the HRP-loaded electrode was proportional to HRP concentrations in the incubation solution in the range between 5 mu g mL(-1) and 0.4 mg mL(-1) with a linear slope of 3.34 mu A mL mg(-1) and a correlation coefficient of 0.9945},
  language  = {en}
}
@article{MakCheungTrauetal.2005,
  author    = {Mak, Wing Cheung and Cheung, Kwan Yee and Trau, Dieter and Warsinke, Axel and Scheller, Frieder W. and Renneberg, Reinhard},
  title     = {Electrochemical bioassay utilizing encapsulated electrochemical active microcrystal biolabels},
  issn      = {0003-2700},
  year      = {2005},
  abstract  = {A new approach to perform electrochemical immunoassay based on the utilization of encapsulated microcrystal was developed. The microcrystal labels create a "supernova effect" upon exposure to a desired releasing agent. The microcrystal cores dissolve, and large amounts of signal-generating molecules diffuse across the capsule wall into the outer environment. Layer-by-Layer (LbL) technology was employed for the encapsulation of electrochemical signal- generating microcrystals (ferrocene microcrystals). The encapsulated microcrystals were conjugated with antibody molecules through the adsorption process. The biofunctionalized microcrystals were utilized as a probe for immunoassays. The microcrystal-based label system provided a high-signal molecule to antibody (SIP) ratio of 10(4)-10(5). Microcrystal biolabels with different antibody surface coverage (1.60-5.05 mg m(-2)) were subjected to a solid-phase immunoassay for the detection of mouse immunoglobulin G (M-IgG) molecules. The microcrystal-based immunoassay for the detection of M-IgG performed with microcrystals having antibody surface coverage of 5.05 mg m(-2) showed a sensitivity of 3.93 nA g(- 1) L-1 with a detection limit of 2.82 g L-1},
  language  = {en}
}
@article{SchellerWarsinkePfeifferetal.2004,
  author    = {Scheller, Frieder W. and Warsinke, Axel and Pfeiffer, Dorothea and Czeponik, J.},
  title     = {Biosensorik / Bioanalytik},
  isbn      = {3-87081-372-5},
  year      = {2004},
  language  = {de}
}
@article{LettauWarsinkeLaschewskyetal.2004,
  author    = {Lettau, Kristian and Warsinke, Axel and Laschewsky, Andr{\´e} and Mosbach, K. and Yilmaz, E. and Scheller, Frieder W.},
  title     = {An esterolytic imprinted polymer prepared via a silica-supported transition state analogue},
  year      = {2004},
  abstract  = {In this work we describe a new preparation method for an esterolytic imprinted polymer with catalytic sites on the surface. A template was prepared by immobilizing a transition state analogue (phosphoramidic acid derivative) of an esterolytic reaction within porous silica particles. Polymerization within the pores was carried out using 4- vinylimidazole as a functional monomer and divinylbenzene as a cross-linker. The polymer was released by dissolution of the silica support with hydrofluoric acid and catalytic properties were studied by incubation with three different 4- nitrophenylesters and spectrophotometric determination of the released 4-nitrophenol. For 4-nitrophenyl acetate an activity of 211 nmol min(-1) mg(-1) and a K-m value of 2.2 mmol L-1 was obtained},
  language  = {en}
}
@article{PieperFuerstKleuserStoeckleinetal.2004,
  author    = {Pieper-F{\"u}rst, U. and Kleuser, U. and St{\"o}cklein, Walter F. M. and Warsinke, Axel and Scheller, Frieder W.},
  title     = {Detection of subicomolar concentrations of human matrix metalloproteinase-2 by an optical biosensor},
  year      = {2004},
  abstract  = {We describe in this paper the development of a one-step sandwich assay for the highly sensitive and fast detection of human matrix metalloproteinase (MMP)-2 (EC 3.4.24.24), using surface plasmon resonance (SPR). For the assay, two ligands were selected: monoclonal anti-MMP-2 antibody Ab-2 and the tissue inhibitor of metalloproteinases (TIMP)-2. They were chosen on the basis of (1) their affinities to MMP-2, (2) the efficiency of immobilization to the sensor chip, (3) the efficiency of adsorption to colloidal gold, and (4) the stability of these protein-coated gold particles. The assay included mixing of MMP-2 with antibody Ab-2 adsorbed to colloidal gold with a diameter of about 20 rim and injection into the flowcell of the SPR instrument containing immobilized TIMP-2. By using colloidal gold particles an amplification factor of 114 and a detection limit of 0.5 pM for MMP-2 were obtained. The precision of the assay was high even at low analyte concentrations, the standard deviation being 8.3\% for five determinations of 1 pM MMP- 2. No significant binding was observed with the structurally related MMP-9. The assay is far more sensitive and faster than commonly used methods for MMP-2 detection. As TIMP-bound MMP-2 is not detected by this method, the assay can be applied for measuring free MMP-2, reflecting the imbalance of free and inhibitor-bound enzyme in various pathological situations. (C) 2004 Elsevier Inc. All rights reserved},
  language  = {en}
}
@article{StoellnerSchellerWarsinke2002,
  author    = {Stoellner, Daniela and Scheller, Frieder W. and Warsinke, Axel},
  title     = {Activation of cellulose membranes with 1,1{\"i}-carbonyldiimidazole or 1-cyano-4-4-dimethylaminopyridinium tetrafluoroborate as a basis for the development of immunosensors},
  year      = {2002},
  language  = {en}
}
@article{StoeckleinWarsinkeScheller1997,
  author    = {St{\"o}cklein, Walter F. M. and Warsinke, Axel and Scheller, Frieder W.},
  title     = {Organic solvent modified enzyme-liked immunoassay for the detection of triazine herbicides},
  year      = {1997},
  language  = {en}
}
@article{GajovicWarsinkeScheller1997,
  author    = {Gajovic, Nenad and Warsinke, Axel and Scheller, Frieder W.},
  title     = {Comparsion of two enzyme sequences for a novel L-malate biosensor},
  year      = {1997},
  language  = {en}
}
@article{KleinjungBeierWarsinkeetal.1997,
  author    = {Kleinjung, Frank and Beier, Frank F. and Warsinke, Axel and Scheller, Frieder W.},
  title     = {Fibre-optic genosensor for specific determination of femtomolar DNA oligomers},
  year      = {1997},
  language  = {en}
}
@article{GajovicWarsinkeScheller1995,
  author    = {Gajovic, Nenad and Warsinke, Axel and Scheller, Frieder W.},
  title     = {A novel multienzyme electrode for the determination of citrate},
  year      = {1995},
  language  = {en}
}
@article{StoeckleinWarsinkeMicheeletal.1998,
  author    = {St{\"o}cklein, Walter F. M. and Warsinke, Axel and Micheel, Burkhard and H{\"o}hne, Wolfgang and Woller, Jochen and Kempter, Gerhard and Scheller, Frieder W.},
  title     = {Characterization of a monoclonal antibody and its Fab fragment against diphenylurea hapten with BIA},
  isbn      = {3-8154-3540-4},
  year      = {1998},
  language  = {en}
}
@article{WarsinkeStancikMacholanetal.1998,
  author    = {Warsinke, Axel and Stancik, L. and Machol{\´a}n, L. and Pfeiffer, Dorothea and Scheller, Frieder W.},
  title     = {Biosensors for food analysis : application of biosensors to food requirements},
  isbn      = {0-85404-750-6},
  year      = {1998},
  language  = {en}
}
@article{StoeckleinWarsinkeMicheeletal.1997,
  author    = {St{\"o}cklein, Walter F. M. and Warsinke, Axel and Micheel, Burkhard and H{\"o}hne, Wolfgang and Woller, Jochen and Kempter, Gerhard and Scheller, Frieder W.},
  title     = {Detection of diphenylurea derivatives with biospecific interaction analysis (BIA) : Kinetic investigations},
  year      = {1997},
  language  = {en}
}
@article{WarsinkeBenkertScheller1996,
  author    = {Warsinke, Axel and Benkert, Alexander and Scheller, Frieder W.},
  title     = {Biomolecular modules for creatinine determination},
  year      = {1996},
  language  = {en}
}
@article{HalamekWollenbergerStoeckleinetal.2007,
  author    = {Hal{\´a}mek, Jan and Wollenberger, Ursula and St{\"o}cklein, Walter F. M. and Warsinke, Axel and Scheller, Frieder W.},
  title     = {Signal amplification in immunoassays using labeling via boronic acid binding to the sugar moiety of immunoglobulin G : proof of concept for glycated hemoglobin},
  issn      = {0003-2719},
  doi       = {10.1080/00032710701327096},
  year      = {2007},
  abstract  = {A novel electrochemical immunoassay based on the multiple affinity labeling of the indicator antibody with an electro-active tag is presented. The concept is illustrated for the determination of the glycated hemoglobin HbA1c in hemoglobin samples. Hemoglobin is adsorbed to the surfactant-modified surface of a piezoelectric quartz crystal. Whereas the quartz crystal nanobalance is used to validate the total Hb binding, the HbA1c on the sensor surface is recognized by an antibody and quantified electrochemically after the sugar moieties of the antibody have been labeled in-situ with ferroceneboronic acid. The sensitivity of this sensor is about threefold higher than the sensitivity of a hemoglobin sensor, where the ferroceneboronic acid is bound directly to HbA1c.},
  language  = {en}
}
@article{StoeckleinWarsinkeMicheeletal.1998,
  author    = {St{\"o}cklein, Walter F. M. and Warsinke, Axel and Micheel, Burkhard and Kempter, Gerhard and H{\"o}hne, Wolfgang and Scheller, Frieder W.},
  title     = {Diphenylurea hapten sensing with a monoclonal antibody and its Fab fragment : kinetic and thermodynamic investigations},
  year      = {1998},
  language  = {en}
}
@article{HuangWarsinkeKuwanaetal.1998,
  author    = {Huang, T. and Warsinke, Axel and Kuwana, T. and Scheller, Frieder W.},
  title     = {The determination of L-phenylalanine based on a novel NADH-detecting biosensor},
  year      = {1998},
  language  = {en}
}
@article{GajovicWarsinkeScheller1998,
  author    = {Gajovic, Nenad and Warsinke, Axel and Scheller, Frieder W.},
  title     = {A bienzyme electrode for L-malate based on a novel and general design},
  year      = {1998},
  language  = {en}
}
@article{StoellnerStoeckleinSchelleretal.2002,
  author    = {St{\"o}llner, Daniela and St{\"o}cklein, Walter F. M. and Scheller, Frieder W. and Warsinke, Axel},
  title     = {Membrane-immobilized haptoglobin as affinity matrix for a hemoglobin-A1c-immunosensor},
  year      = {2002},
  language  = {en}
}
@article{SchellerWollenbergerWarsinkeetal.2001,
  author    = {Scheller, Frieder W. and Wollenberger, Ursula and Warsinke, Axel and Lisdat, Fred},
  title     = {Research and development in biosensors},
  year      = {2001},
  language  = {en}
}
@article{WarsinkeBenkertScheller2000,
  author    = {Warsinke, Axel and Benkert, Alexander and Scheller, Frieder W.},
  title     = {Electrochemical immunoassays},
  year      = {2000},
  language  = {en}
}
@article{GajovicBinyaminWarsinkeetal.2000,
  author    = {Gajovic, Nenad and Binyamin, Gary and Warsinke, Axel and Scheller, Frieder W. and Heller, A.},
  title     = {Operation of a miniature redox hydrogel-based pyruvate sensor in undiluted deoxygenated calf serum},
  year      = {2000},
  language  = {en}
}
@article{ChenWarsinkeGajovicetal.2000,
  author    = {Chen, Ziping and Warsinke, Axel and Gajovic, Nenad and Große, St. and Hu, J. and Kleber, H.-P. and Scheller, Frieder W.},
  title     = {A D-carnitine dehydrogenase electrode for the assessment of enantiomeric purity of L-carnitine preparations},
  year      = {2000},
  language  = {en}
}
@phdthesis{BenkertSchellerSchoessleretal.2000,
  author    = {Benkert, Alexander and Scheller, Frieder W. and Sch{\"o}ssler, W. and Micheel, Burkhard and Warsinke, Axel},
  title     = {Size exclusion redox-labeled immunoassay (SERI) : a new format for homogeneous amperometric creatinine determination},
  year      = {2000},
  language  = {en}
}
@article{StoeckleinBehrsingScharteetal.2000,
  author    = {St{\"o}cklein, Walter F. M. and Behrsing, Olaf and Scharte, Gudrun and Micheel, Burkhard and Benkert, Alexander and Sch{\"o}ssler, W. and Warsinke, Axel and Scheller, Frieder W.},
  title     = {Enzyme kinetic assays with surface plasmon resonance (BIAcore) based on competition between enzyme and creatinine antibody},
  year      = {2000},
  language  = {en}
}
@article{StoeckleinRohdeScharteetal.2000,
  author    = {St{\"o}cklein, Walter F. M. and Rohde, M. and Scharte, Gudrun and Behrsing, Olaf and Warsinke, Axel and Micheel, Burkhard and Scheller, Frieder W.},
  title     = {Sensitive detection of triazine and phenylurea pesticides in pure organic solvent by enzyme linked immunsorbent assay (ELISA): stabilities, solubilities and sensitives},
  year      = {2000},
  language  = {en}
}
@article{HuangWarsinkeKoroljovaSkorobogatkoetal.1999,
  author    = {Huang, T. and Warsinke, Axel and Koroljova-Skorobogatko, O. V. and Makower, Alexander and Kuwana, T. and Scheller, Frieder W.},
  title     = {A bienzyme carbon paste electrode for the sensitive detection of NADPH and the measurement of glucose-6- phosphate dehydrogenase},
  year      = {1999},
  language  = {en}
}
@article{GajovicHabermuellerWarsinkeetal.1999,
  author    = {Gajovic, Nenad and Haberm{\"u}ller, K. and Warsinke, Axel and Schuhmann, W. and Scheller, Frieder W.},
  title     = {A pyruvate oxidase electrode based on an electrochemically deposited redox polymer},
  year      = {1999},
  language  = {en}
}
@article{GajovicWarsinkeHuangetal.1999,
  author    = {Gajovic, Nenad and Warsinke, Axel and Huang, T. and Schulmeister, Thomas and Scheller, Frieder W.},
  title     = {Characterization and mathematical modelling of a novel bienzyme electrode for L-malate with cofactor recycling},
  year      = {1999},
  language  = {en}
}
@article{SchellerBauerMakoweretal.2002,
  author    = {Scheller, Frieder W. and Bauer, Christian G. and Makower, Alexander and Wollenberger, Ursula and Warsinke, Axel and Bier, Frank Fabian},
  title     = {Immunoassays using enzymatic amplification electrodes},
  isbn      = {0-7484-0791-X},
  year      = {2002},
  language  = {en}
}
@article{SchellerBauerMarkoweretal.2001,
  author    = {Scheller, Frieder W. and Bauer, Christian G. and Markower, Alexander and Wollenberger, Ursula and Warsinke, Axel and Bier, Frank Fabian},
  title     = {Coupling of immunoassays with enzymatic recycling electrodes},
  year      = {2001},
  language  = {en}
}