Succinate vs tartrate
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Comparative Analysis of Succinate and Tartrate Salts
Pharmacokinetics of Solifenacin Tartrate vs. Solifenacin Succinate
Solifenacin, a muscarinic antagonist used to treat overactive bladder, is available in different salt forms, including tartrate and succinate. A study comparing the pharmacokinetics and safety of solifenacin tartrate and solifenacin succinate in healthy male volunteers found that both formulations exhibited similar pharmacokinetic properties. The mean AUClast values were 486.98 h·ng/mL for solifenacin tartrate and 469.07 h·ng/mL for solifenacin succinate, while the mean Cmax values were 14.66 ng/mL and 14.10 ng/mL, respectively. The 90% confidence intervals for AUClast and Cmax indicated bioequivalence between the two formulations. Both formulations were well-tolerated with no significant differences in safety profiles .
Structural and Thermal Behavior of Metoprolol Tartrate vs. Metoprolol Succinate
Metoprolol, a beta-blocker, is also available in tartrate and succinate salt forms. Studies on their solid-state structures reveal that despite molecular similarities, they exhibit different macroscopic behaviors. Metoprolol succinate (MS-m) shows a reversible anisotropic lattice expansion/contraction with temperature changes and quickly recrystallizes after melting. In contrast, metoprolol tartrate (MT-o) expands/contracts isotropically and forms an amorphous solid upon cooling, which takes several days to revert to its crystalline form Paoli2016Rossi2018. These differences are crucial for pharmaceutical applications, affecting the drug's stability and shelf life.
Toxicological Profiles of Succinate Tartrates
A subchronic oral toxicity study in rats administered with succinate tartrates (ST) showed no mortality or significant toxicological effects. The study observed a significant decrease in serum magnesium levels in females at higher doses but no other treatment-related changes in body weight, food consumption, or organ weights. The no-observed-adverse-effect level (NOAEL) was determined to be 0.5% ST, indicating a relatively safe profile for these compounds .
Environmental Impact of Succinate Tartrates
Succinate tartrates, used as water softening agents in commercial cleaning products, have been evaluated for their environmental safety. Toxicological studies on various freshwater and marine species revealed median effect concentrations ranging from 110 to >1000 mg/L. Chronic studies showed no observed effect concentrations between 16 to 560 mg/L. The studies also noted an inverse relationship between water hardness and toxicity, with low bioconcentration factors, suggesting minimal environmental impact .
Structural Dynamics in Layered Double Hydroxides
The structural and dynamic properties of tartrate and succinate anions intercalated in Zn2Al layered double hydroxides (LDHs) were investigated. Tartrate anions exhibited specific rotational and diffusion behaviors due to their hydroxyl groups, affecting the organization of water molecules in the interlayer domain. These differences in structural dynamics are significant for applications in materials science and catalysis Pisson2011Prévot1998.
Role in Escherichia coli Fermentation
In Escherichia coli, the TtdT antiporter is essential for the uptake of L-tartrate and the export of succinate during anaerobic fermentation. The TtdT gene, part of the ttdABT operon, is crucial for the bacterium's ability to grow on L-tartrate. Deletion of ttdT abolishes L-tartrate fermentation, highlighting the specific role of this transporter in the metabolic pathway .
Conclusion
Succinate and tartrate salts, while similar at the molecular level, exhibit distinct pharmacokinetic, structural, toxicological, and environmental properties. These differences are critical for their respective applications in pharmaceuticals, environmental safety, and materials science. Understanding these nuances helps in optimizing their use in various fields.
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Subchronic oral toxicity of succinate tartrates in rats.
No significant adverse effects were observed in rats at 0.5% succinate tartrate in drinking water for 91 days, with no mortality or toxicological signs observed.
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