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Maximizing product quality attributes by optimizing process parameters and performance attributes is a crucial aspect of bioprocess chromatography process design. Process parameters include but are not limited to bed height, eluate cut points, and elution pH. An under-characterized chromatography process parameter for protein A chromatography is process temperature. Here, we present a mechanistic understanding of the effects of temperature on the protein A purification of a monoclonal antibody (mAb) using a commercial chromatography resin for batch and continuous counter-current systems. A self-designed 3D-printed heating jacket controlled the 1 mL chromatography process temperature during the loading, wash, elution, and cleaning-in-place (CIP) steps. Batch loading experiments at 10, 20, and 30 °C demonstrated increased dynamic binding capacity (DBC) with temperature. The experimental data were fit to mechanistic and correlation-based models that predicted the optimal operating conditions over a range of temperatures. These model-based predictions optimized the development of a 3-column temperature-controlled periodic counter-current chromatography (TCPCC) and were validated experimentally. Operating a 3-column TCPCC at 30 °C led to a 47% increase in DBC relative to 20 °C batch chromatography. The DBC increase resulted in a two-fold increase in productivity relative to 20 °C batch. Increasing the number of columns to the TCPCC to optimize for increasing feed concentration resulted in further improvements to productivity. The feed-optimized TCPCC showed a respective two, three, and four-fold increase in productivity at feed concentrations of 1, 5, and 15 mg/mL mAb, respectively. The derived and experimentally validated temperature-dependent models offer a valuable tool for optimizing both batch and continuous chromatography systems under various operating conditions.
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http://dx.doi.org/10.1016/j.chroma.2024.465110 | DOI Listing |
Front Chem
December 2024
Chemistry Department, NanoStruc Research Group, Faculty of Science, Helwan University, Cairo, Egypt.
Introduction: This study investigates the synthesis of silver nanoparticles (Ag NPs) using Helianthemum lippii extract and evaluates their photoprotective, anti-hemolytic, antibacterial, and anti-inflammatory properties compared to various extract fractions, including total aqueous extract (AE), flavonoid monoglycosides (FMG), flavonoid diglycosides/triglycosides (FDG/FTG), tannins (TN), and anthocyanins (AC). Helianthemum lippii is rich in bioactive compounds such as caffeic acid, p-coumaric acid, and gallic acid, known for their therapeutic potential. This study aims to determine whether embedding these phytochemicals into Ag NPs enhances their biomedical applications compared to the natural extract fractions.
View Article and Find Full Text PDFEnviron Sci Process Impacts
December 2024
Department of Chemistry, University of Toronto, Canada.
Proton transfer reaction mass spectrometry (PTR-MS) is often employed to characterize gas-phase compounds in both indoor and outdoor environments. PTR-MS measurements are usually made without upstream chromatographic separation, so it can be challenging to differentiate between an ion of interest, its isomers, and fragmentation products from other species all detected at the same mass-to-charge ratio. These isomeric contributions and fragmentation interferences can confound the determination of accurate compound mixing ratios, the assignment of accurate chemical properties, and corresponding analyses of chemical fate.
View Article and Find Full Text PDFJ Pharm Biomed Anal
December 2024
State Key Laboratory for Quality Ensurance and Sustainable Use of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing 100700, China; Institute of Collaborative Innovation in Great Health, College of Biotechnology and Food Science, Tianjin Key Laboratory of Food Biotechnology, Tianjin University of Commerce, Tianjin 300134, China. Electronic address:
Huo-Xiang-Zheng-Qi Mixture is a renowned traditional Chinese medicine formula used to treat ailments associated with dampness pathogens. This study employed ultra-high-performance liquid chromatography coupled with quadrupole time-of-flight mass spectrometry to perform a comprehensive qualitative and quantitative analysis of the chemical compounds in Huo-Xiang-Zheng-Qi Mixture. A total of 155 compounds were identified, including 61 flavonoids and their glycosides, 36 phenylethanoid glycosides, 23 saponins, 14 coumarins, 9 organic acids, 1 amino acid, 2 nucleosides and purines, and 9 additional compounds.
View Article and Find Full Text PDFJ Chromatogr A
December 2024
Department of Biochemical Engineering, School of Chemical Engineering and Technology and Key Laboratory of Systems Bioengineering and Frontiers Science Center for Synthetic Biology (Ministry of Education), Tianjin University, Tianjin 300350, PR China. Electronic address:
Our previous studies on protein adsorption onto anion-exchangers of poly(ethylenimine) (PEI)-grafted Sepharose FF (PEI-Sepharose) proved their significantly improved performance over the commercial nongrafting anion-exchangers such as Q Sepharose FF, and it was found the protein adsorption behavior on PEI-Sepharose was more sensitive to counterions (Cl, SCN, HPO and SO). However, the complicated role of counterions has not been well interpreted due to their distinct chemical and physical characteristics. Thus, we have further studied the counterion effects by adding two halide ions (F and Br) to explore the effects of the three halide ions on bovine serum albumin adsorption and the results were compared with previous data.
View Article and Find Full Text PDFData Brief
December 2024
University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering, Pierottijeva 6, HR-10000 Zagreb, Croatia.
Large and complex karst catchments, like the one in Southern Dalmatia (Croatia) and Western Herzegovina (Bosnia and Herzegovina), are fragile environments requiring careful protection and sustainable water resources management. Understanding the processes that influence karst aquifer water chemistry is essential for the effective protection of water quality and quantity, ensuring sustainable resource availability and minimizing vulnerability to contamination. A hydrogeochemical dataset comprising over 30 groundwater (springs) and surface water samples, was collected in this cross-border catchment area from September 2013 to September 2020, accounting for seasonal variations.
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