Refine
Institute
- Fachbereich Chemie und Biotechnologie (20) (remove)
Has Fulltext
- yes (20) (remove)
Document Type
- Article (14)
- Bachelor Thesis (3)
- Conference Proceeding (1)
- Diploma Thesis (1)
- Report (1)
Keywords
- Bacillaceae (2)
- Biotechnological application (2)
- Subtilases (2)
- Subtilisin (2)
- (Poly)saccharides (1)
- Algal Turf Scrubber (1)
- Algal–bacterial bioflm (1)
- Alkalihalobacillus okhensis (1)
- Aloe vera (1)
- Biofuel (1)
- Biogas (1)
- Biological hydrogen (1)
- Biorefinery (1)
- Broad pH spectrum (1)
- Butanol (1)
- Carrier solvents (1)
- Chondroitin sulfate (1)
- Circular bioeconomy (1)
- Clostridium acetobutylicum (1)
- Dark fermentation (1)
- Dietary supplements (1)
- Electronic cigarettes (1)
- Free-base nicotine (1)
- Glucosamine (1)
- Halotolerant protease (1)
- High-field NMR (1)
- Hydrolysis (1)
- Lignocellulose (1)
- Low field NMR (1)
- Methane (1)
- Organic acids (1)
- Organic waste (1)
- Polysaccharides (1)
- Pretreatment (1)
- Spectroscopy (1)
- Streptomyces griseus (1)
- Streptomyces lividans (1)
- Weak organic acids (1)
- Wärmeübertragung (1)
- acetoin (1)
- acetoin reductase (1)
- alcoholic beverages (1)
- bio-methane (1)
- biosensors (1)
- bubble column (1)
- capacitive field-effect sensors (1)
- detergent protease (1)
- halotolerant protease (1)
- high-alkaline subtilisin (1)
- methanation (1)
- oxidative stable protease (1)
- plug flow reactor (1)
- power-to-gas (1)
- qNMR (1)
- recombinant expression (1)
- α-aminoacylase (1)
- ε-lysine acylase (1)
Zugriffsart
- weltweit (14)
With the prevalence of glucosamine- and chondroitin-containing dietary supplements for people with osteoarthritis in the marketplace, it is important to have an accurate and reproducible analytical method for the quantitation of these compounds in finished products. NMR spectroscopic method based both on low- (80 MHz) and high- (500–600 MHz) field NMR instrumentation was established, compared and validated for the determination of chondroitin sulfate and glucosamine in dietary supplements. The proposed method was applied for analysis of 20 different dietary supplements. In the majority of cases, quantification results obtained on the low-field NMR spectrometer are similar to those obtained with high-field 500–600 MHz NMR devices. Validation results in terms of accuracy, precision, reproducibility, limit of detection and recovery demonstrated that the developed method is fit for purpose for the marketed products. The NMR method was extended to the analysis of methylsulfonylmethane, adulterant maltodextrin, acetate and inorganic ions. Low-field NMR can be a quicker and cheaper alternative to more expensive high-field NMR measurements for quality control of the investigated dietary supplements. High-field NMR instrumentation can be more favorable for samples with complex composition due to better resolution, simultaneously giving the possibility of analysis of inorganic species such as potassium and chloride.