Production and Recovery of Pyruvic Acid: Recent Advances

Reproducible Green Syntheses Using Hybrid Sol-Gel Catalysts

Referring to selected examples of reproducible green syntheses using hybrid sol-gel catalysts of the SiliaCat series from different doctoral theses and research works published between 2015 and early 2024, this study briefly illustrates how said catalysts have been applied in a number of green synthetic methods of significant industrial relevance. This shows evidence that the nanochemistry "bottom-up" sol-gel approach based on catalytic species entrapped in organically modified silicas as effective and versatile heterogeneous catalysts developed between the late 1990s and 2010 has succeeded. Subsequent developments will show how the use of said materials in automated syntheses, supplying data to machine learning algorithms actually leads to faster and cheaper optimization of the reaction conditions. Said progress ultimately will further accelerate industrial uptake of heterogeneous catalysis under flow in the fine chemical industry whose reluctance to change processes was due to the need to replace financially amortized (and expensive) production plants.

Analysis of carboxylic acids of Crambe cordifolia Steven

Crambe cordifolia Steven is a perennial herb and contains many biologically active substances, including amino acids, quercetin and glycosides of kaempferol. In continuation of the investigation of these plant compounds, it is advisable to study the qualitative composition and quantitative contents of carboxylic acids. Using a HPLC method the quantitative content of the following organic acids was identified and determined: pyruvic (40.66 mg/g), isocitric (12.88 mg/g), citric (8.71 mg/g), succinic (38.03 mg/g) and malic (0.75 mg/g). Among fatty acids the saturated and unsaturated acids were determined by the GC/MS method. The content of polyunsaturated fatty acids of the total fatty acids was 56.97%, saturated – 38.53% and monounsaturated – 4.50%. Linolenic and palmitic acids dominated among the determined 7 fatty acids, their content was 9.68 mg/g (47.87%) and 4.88 mg/g (24.14%). The results of the study show that Crambe cordifolia Steven leaves is a source of carboxylic acids.

Investigating the inotropic effect of pyruvic acid on the isolated rat heart and its underlying mechanism

Pyruvic acid is important organic chemical intermediates that plays a role in cardiomyocyte pathophysiology and therapy. This study sought to explore the inotropic effects of pyruvic acid on the function of the isolated rat hearts and investigate its underlying mechanism. Pyruvic acid produced a greater negative inotropic effect compared to HCl and sodium pyruvate in a concentration-dependent pattern in the hearts. The role of low dose of pyruvic acid on heart function was regulated by pyruvic acid molecules and high dose pyruvic acid may be influenced by pyruvic acid molecules and pH. K_v channels may be involved in the pyruvic acid-induced negative inotropic effect. Finally, pyruvic acid markedly increased the level of LDH and CK and reduced the level of Ca²⁺Mg²⁺-ATPase and Na⁺K⁺-ATPase. These results suggest that pyruvic acid may modulate cardiac function at physiological or low doses but can cause damage to cardiomyocytes at high doses.