https://fuldok.hebis.de/xmlui/handle/fuldok/12 2026-05-01T21:06:54Z 2026-05-01T21:06:54Z Herold, Marius Morick, Sören Oliver, Hensel Grupa, Uwe https://fuldok.hebis.de/xmlui/handle/fuldok/819 2025-10-30T11:27:12Z 2021-05-18T00:00:00Z

Influence of Raw Meat Content on 3D-Printing and Rheological Properties Herold, Marius; Morick, Sören; Oliver, Hensel; Grupa, Uwe The aim of this study was to investigate the influence of raw chicken meat content on the rheological properties and 3D printability of minced meat mixtures using different concentrations of raw and cooked chicken meat. The meat mass contained yolk, crushed ice, lean raw meat and cooked meat with a high concentration of connective tissue. The concentrations of raw meat added to cooked meat as a percentage of the total weight of meat were 0; 30; 40; 50; 60; 70 and 100. To determine the rheological properties, amplitude sweep and frequency sweep were carried out with a Rheostress RS 300 (Thermo Fisher Scientific Inc.). Cubes were printed, and the printability and optical impression were evaluated using grades from 1-5. The results showed that rheological properties had a strong influence on the printability of meat mass and it is necessary for G’ (storage modulus) at the LVR (linear viscoelastic region) to be higher than 7000 Pa. The complex viscosity | η* | should be higher than 170 Pa, at a shear stress τ = 10 Pa, and a frequency f = 10 Hz used to guarantee sufficient solidity.

2021-05-18T00:00:00Z Braun-Münker, Myriam Anton, Callum-James Ecker, Felix https://fuldok.hebis.de/xmlui/handle/fuldok/810 2025-10-30T11:27:38Z 2023-10-19T00:00:00Z

Thin-layer chromatography quantification of ibuprofen using digital imaging Braun-Münker, Myriam; Anton, Callum-James; Ecker, Felix Ibuprofen is a pharmaceutical that is commonly used to reduce inflammation and to treat headaches. A thin-layer chromato-graphic method combined with simple and inexpensive digital imaging is proposed for the determination and quantification of ibuprofen. The recommendations of the standard pharmacopoeia were followed with the addition of a minimal spotting method as a local calibration curve (n = 3) and comparison with a spotted sample. Images were acquired using a smartphone and then converted to greyscale using Fiji, an open-source image analysis software. The peak area and density of each spot was then calculated using a densitometric principle. To analyse the present image data, several images were taken with different filters. Using a calibration curve ranging in the range of 3 to 5 mg/mL, linearity could be determined across the subjected images (R2 ranging from 0.984 to 0.996), with a mean accuracy of 99.9 ± 2.20% and RSD of 2.20%. The method studied, using smartphone imaging and open-source software (Fiji), offered a simple and inexpensive application for the quantification of ibuprofen in pharmaceuticals, applicable to preliminary studies and curricula.

2023-10-19T00:00:00Z Birringer, Marc Siems, Karsten Maxones, Alexander Frank, Jan Lorkowski, Stefan https://fuldok.hebis.de/xmlui/handle/fuldok/513 2025-10-29T16:44:24Z 2018-01-26T00:00:00Z

Natural 6-hydroxy-chromanols and -chromenols: structural diversity, biosynthetic pathways and health implications Birringer, Marc; Siems, Karsten; Maxones, Alexander; Frank, Jan; Lorkowski, Stefan We present the first comprehensive and systematic review on the structurally diverse toco-chromanols and -chromenols found in photosynthetic organisms, including marine organisms, and as metabolic intermediates in animals. The focus of this work is on the structural diversity of chromanols and chromenols that result from various side chain modifications. We describe more than 230 structures that derive from a 6-hydroxy-chromanol- and 6-hydroxy-chromenol core, respectively, and comprise di-, sesqui-, mono- and hemiterpenes. We assort the compounds into a structure–activity relationship with special emphasis on anti-inflammatory and anti-carcinogenic activities of the congeners. This review covers the literature published from 1970 to 2017.

2018-01-26T00:00:00Z