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Isolation and characterization of exopolysaccharides from kombucha samples of different origins
Int J Biol Macromol. 2024 Apr 5:131377. doi: 10.1016/j.ijbiomac.2024.131377. Online ahead of print.ABSTRACTKombucha is prepared by fermenting sugared green or black tea with a symbiotic culture of bacteria and yeast (SCOBY). Some of the bacteria within the SCOBY are known to form exopolysaccharides (EPS) from sucrose. However, it is yet unknown whether EPS are formed in kombucha, and if so, which specific EPS are present. Therefore, different kombucha samples were prepared by fermentation of green and black tea with SCOBYs from different manufacturers. Subsequently, the EPS were isolated and characterized by using various ...
Source: International Journal of Biological Macromolecules - April 7, 2024 Category: Biochemistry Authors: Verena Hassler Nele Brand Daniel Wefers Source Type: research

Assessment of Culture Systems to Produce Bacterial Cellulose with a Kombucha Consortium
Appl Biochem Biotechnol. 2024 Apr 1. doi: 10.1007/s12010-024-04929-z. Online ahead of print.ABSTRACTBacterial cellulose (BC) is an emerging material for high-end applications due to its biocompatibility and physicochemical characteristics. However, the scale-up production of this material is still expensive, with the culture medium constituting one-third of the total cost. Herein, four different media (yeast nitrogen base, YNB; Murashige and Skoog, MSO; black tea; and NPK fertilizer solution) were compared while using sucrose as an additional carbon source. The yields of BC were best for YNB and fertilizer with 0.37 and 0....
Source: Applied Biochemistry and Biotechnology - April 1, 2024 Category: Biochemistry Authors: Maribel Hern ández-Guerrero Diego Gomez-Maldonado Jorge Guti érrez-Castañeda Sergio Revah Jos é Campos-Terán Gabriel Vigueras-Ram írez Source Type: research

Sensors, Vol. 24, Pages 1974: Mid-Infrared Photothermal Spectroscopy for the Detection of Caffeine in Beverages
In this study, we propose an alternative technique for caffeine analysis that relies on mid-infrared laser-based photothermal spectroscopy (PTS). PTS exploits the high-power output of the quantum cascade laser (QCL) sources to enhance the sensitivity of the mid-IR measurement. The laser-induced thermal gradient in the sample scales with the analytes&rsquo; absorption coefficient and concentration, thus allowing for both qualitative and quantitative assessment. We evaluated the performance of our experimental PTS spectrometer, incorporating a tunable QCL and a Mach&ndash;Zehnder interferometer, for detecting...
Source: Sensors - March 20, 2024 Category: Biotechnology Authors: Giovanna Ricchiuti Lisa Riedlsperger Alicja Dabrowska Erwin Rosenberg Liam O ’Faolain Bernhard Lendl Tags: Article Source Type: research

Effects of coffee and tea on postprandial cardiometabolic risk factors in healthy individuals: a randomized crossover trial
CONCLUSIONS: Green tea ingestion can lower the elevation of serum TG and TC levels after high-fat or high-cholesterol diets. Our findings have far-reaching implications given the widespread use of coffee and tea and the current concern over cardiometabolic risk factors.PMID:38494692 | DOI:10.6133/apjcn.202403_33(1).0011 (Source: Asia Pacific Journal of Clinical Nutrition)
Source: Asia Pacific Journal of Clinical Nutrition - March 18, 2024 Category: Nutrition Authors: Chunmei Zhang Jiayu Zhang Duo Li Xiaojie Hu Source Type: research