The retention factor is one of the most universally used parameters in chromatography. The errors associated with the conventional ways to determine the retention factor of compounds in liquid chromatography are studied and compared with those corresponding to new approaches. The later avoid the use of extra-column time and hold-up time values, which have proven to be tedious and ambiguous. Simulations and real data, used to examine the accuracy of four different approaches (two classic and two new), suggest that the new approaches could be considered more satisfactory than the classic ones.
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http://dx.doi.org/10.1016/j.chroma.2005.07.061 | DOI Listing |
J Clin Exp Hepatol
November 2024
Department of Nephrology, Post Graduate Institute of Medical Education and Research, Chandigarh, India.
Background: Renal impairment significantly affects morbidity and mortality rates of cirrhosis patients. Studies on glomerular filtration rate (eGFR) estimation did not include cirrhosis patients. These equations are erroneous and unreliable in cirrhosis due to sarcopenia.
View Article and Find Full Text PDFCurr Res Food Sci
December 2024
Veterinary Study Program, Faculty of Medicine, Universitas Padjadjaran, Bandung, Indonesia.
Terasi, a traditional Indonesian seafood product made from shrimp, undergoes fermentation facilitated by a consortium of microorganisms, including Lactic Acid Bacteria (LAB) and yeast, which contribute to its distinctive umami flavor. This study investigates the microbial dynamics and production of key metabolites, including γ-aminobutyric acid (GABA), during terasi fermentation. Total Plate Count (TPC) and High-Performance Liquid Chromatography (HPLC) were used to monitor changes in glutamate and GABA levels, with glutamate increasing from 105.
View Article and Find Full Text PDF3 Biotech
January 2025
Department of Traditional Chinese Medicine, Binzhou Medical University Hospital, Binzhou, 256603 Shandong China.
The etiology and pathogenesis of Alzheimer's disease (AD) are complex, and currently, no comprehensive treatment measures exist. In this study, we initially utilized ultra-high-performance liquid chromatography with quadrupole orbitrap mass spectrometry (UHPLC-QE-MS) to profile the bioactive constituents of SZLOL present in the bloodstream. Subsequent Y-maze experimental data demonstrated that SZLOL could ameliorate short-term memory deficits in APP/PS1 mice.
View Article and Find Full Text PDFJ Pharm Anal
November 2024
National Key Laboratory of Chinese Medicine Modernization, Tianjin University of Traditional Chinese Medicine, Tianjin, 301617, China.
In this study, 34 deep eutectic solvents (DESs) were successfully prepared for the extraction of proanthocyanidin from Rhodiolae Crenulatae Radix et Rhizomes. The extraction process was optimized using single factor exploration and Box-Behnken design-response surface analysis. The extraction rate was significantly improved when the molar ratio of choline chloride to 1,3-propanediol was 1:3.
View Article and Find Full Text PDFPrev Nutr Food Sci
December 2024
Department of Food Science and Biotechnology, BB21 Project Team, Kyungsung University, Busan 48434, Korea.
The objective of this study was to examine the lignan content and antioxidant activity of eight Korean sesame seed varieties. We analyzed the lignan content using two different techniques: (1) liquid chromatography coupled with tandem mass spectrometry, and (2) high-performance liquid chromatography coupled with ultraviolet detection. We identified that in sesame seeds, the sesamolin lignan occurs at the highest concentration (ranging between 4.
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