TY  - JOUR
A1  - Elbers, Gereon
A1  - Zang, Thorsten
A1  - Buck, Manfred
T1  - Ruß-Immissionsmessungen im Einflußbereich des Kraftfahrzeugverkehrs
JF  - Staub, Reinhaltung der Luft : air quality control. 50 (1990)
Y1  - 1990
SN  - 0039-0771
SP  - 93
ER  - 
TY  - JOUR
A1  - Elbers, Gereon
A1  - Bauer, H. D.
A1  - Buck, Manfred
A1  - Dahmann, D.
T1  - Rußmessungen am Arbeitsplatz und in der Außenluft - Vergleich zweier Meßmethoden  / H.D. Bauer, M. Buck, D. Dahmann, G. Elbers, H.-H. Fricke
JF  - Staub, Reinhaltung der Luft : air quality control. 54 (1994)
Y1  - 1994
SN  - 0039-0771
SP  - 55
ER  - 
TY  - JOUR
A1  - Elbers, Gereon
A1  - Nieren, Monika
A1  - Hoffmann, Katharina
A1  - Gäb, Martina
T1  - Schnellerfassung der Wirkung von Luftschadstoffen auf Pflanzen mit der Nahinfrarotspektroskopie (NIRS). Untersuchung Ammoniak exponierter Gräser und Kräuter  / Nieren, Monika ; Hoffmann, Katharina ; Gäb, Martina ; Ooyen, Sven van ; Köllner, Barbara ; Elbe
JF  - Immissionsschutz. 13 (2008), H. 2
Y1  - 2008
SN  - 1430-9262
SP  - 82
EP  - 90
ER  - 
TY  - JOUR
A1  - Elbers, Gereon
A1  - Buck, Manfred
T1  - Soot Concentration in Ambient Air / M. Buck, G. Elbers
JF  - Erdöl & Kohle, Erdgas, Petrochemie : EKEP. 45 (1992)
Y1  - 1992
SN  - 0014-0058
SP  - 219
ER  - 
TY  - CHAP
A1  - Hoffmann, Katharina
A1  - Nieren, Monika
A1  - Gäb, Martina
A1  - Kasper, Anna
A1  - Elbers, Gereon
T1  - The potential of near infrared spectroscopy (NIRS) for the environmental biomonitoring of plants
T2  - International conference on Life Sciences and Technology
N2  - In the current environmental condition, the increase in pollution of the air, water, and soil indirectly will induce plants stress and decrease vegetation growth rate. These issues pay more attention to be solved by scientists worldwide. The higher level of chemical pollutants also induced the gradual changes in plants metabolism and decreased enzymatic activity. Importantly, environmental biomonitoring may play a pivotal contribution to prevent biodiversity degradation and plants stress due to pollutant exposure. Several previous studies have been done to monitor the effect of environmental changes on plants growth. Among that, Near Infrared spectroscopy (NIRS) offers an alternative way to observe the significant alteration of plant physiology caused by environmental damage related to pollution. Impairment of photosynthesis, nutrient and oxidative imbalances, and mutagenesis.
Y1  - 2019
U6  - http://dx.doi.org/10.1088/1755-1315/276/1/012009
SN  - 1755-1315
N1  - IOP Conference Series: Earth and Environmental Science : 276
VL  - 276
IS  - 012009
SP  - 1
EP  - 3
ER  - 
TY  - JOUR
A1  - Block, Franziska
A1  - May, Alexander
A1  - Wetzel, Katharina
A1  - Adels, Klaudia
A1  - Elbers, Gereon
A1  - Schulze, Margit
A1  - Monakhova, Yulia
T1  - What is the best spectroscopic method for simultaneous analysis of organic acids and (poly)saccharides in biological matrices: Example of Aloe vera extracts?
JF  - Talanta Open
N2  - Several species of (poly)saccharides and organic acids can be found often simultaneously in various biological matrices, e.g., fruits, plant materials, and biological fluids. The analysis of such matrices sometimes represents a challenging task. Using Aloe vera (A. vera) plant materials as an example, the performance of several spectro-scopic methods (80 MHz benchtop NMR, NIR, ATR-FTIR and UV–vis) for the simultaneous analysis of quality parameters of this plant material was compared. The determined parameters include (poly)saccharides such as aloverose, fructose and glucose as well as organic acids (malic, lactic, citric, isocitric, acetic, fumaric, benzoic and sorbic acids). 500 MHz NMR and high-performance liquid chromatography (HPLC) were used as the reference methods.

UV–vis data can be used only for identification of added preservatives (benzoic and sorbic acids) and drying agent (maltodextrin) and semiquantitative analysis of malic acid. NIR and MIR spectroscopies combined with multivariate regression can deliver more informative overview of A. vera extracts being able to additionally quantify glucose, aloverose, citric, isocitric, malic, lactic acids and fructose. Low-field NMR measurements can be used for the quantification of aloverose, glucose, malic, lactic, acetic, and benzoic acids. The benchtop NMR method was successfully validated in terms of robustness, stability, precision, reproducibility and limit of detection (LOD) and quantification (LOQ), respectively. All spectroscopic techniques are useful for the screening of (poly)saccharides and organic acids in plant extracts and should be applied according to its availability as well as information and confidence required for the specific analytical goal. Benchtop NMR spectroscopy seems to be the most feasible solution for quality control of A. vera products.
KW  - Spectroscopy
KW  - (Poly)saccharides
KW  - Organic acids
KW  - Aloe vera
KW  - qNMR
Y1  - 2023
U6  - http://dx.doi.org/10.1016/j.talo.2023.100220
SN  - 2666-8319
VL  - 7
IS  - Art. No. 100220
SP  - 1
EP  - 9
PB  - Elsevier
CY  - Amsterdam
ER  -