Oxidation of alcohols by TBHP in the presence of sub-stoichiometric amounts of MnO2

Genetically engineered secretory horseradish peroxidase is a sensitive, stable, and affordable non-lytic reporter gene system for real-time promoter activity management

A light-producing secretory protein that is collectible through the supernatant of a culture medium is essential in a cell-based reporter gene system and allows for real-time monitoring of upstream events of a promoter. Compared to other secretory luciferases, Cypridina luciferase (CLuc) coupled with vargulin emits the brightest signal; however, the signal half-life suffers constantly from the fast oxidation process of the substrate, resulting in a rapid signal depletion, which makes the detection signal short and unstable. In this study, we aimed to develop a new reporter gene system with a more stable signal and lower cost, whilst retaining sensitivity comparable to the CLuc reporter gene system. To this end, we genetically engineered horseradish peroxidase (HRP) to be secreted with mammalian cells. The secreted form HRP (sHRP) was then used as a proof-of-concept of real-time cell signaling management. First, we made sure that HRP retained its enzymatic function with our genetic engineering process and confirmed that it was collectable and suitable for side-by-side comparison with CLuc. sHRP showed comparable sensitivity, 7 to 80 times more signal half-life compared to CLuc, and precisely reported NF-κB-regulated promoter in response to stimulation with TNF-α. sHRP was not affected by multiple cell culturing media and was calculated to be at least 9 times cheaper than the CLuc reporter gene system. Thus, sHRP offers new insight into the reporter gene system for drug screening and intracellular signaling management and provides a precise, sustainable and affordable operating environment.

Mild Aerobic Oxidation of Secondary Alcohols with Water Tolerant Cu(I) Catalyst

Green, aerobic oxidation of secondary alcohols to ketones poses a significant synthetic challenge. To address this, we have developed a highly active (DPA)CuI/ABNO catalyst system capable of aerobically oxidizing a wide range of secondary alcohols, including benzylic and aliphatic derivatives, yielding the corresponding ketones with high yields. The unique feature of this Cu(I) catalyst is its high stability, even in the presence of water. We also prepared CuI from waste copper sources to enhance the system's sustainability.

A green chemistry approach for oxidation of alcohols using novel bioactive cobalt composite immobilized on polysulfone fibrous network nanoparticles as a catalyst

In this study, cobalt composite immobilized on polysulfone fibrous network nanoparticles (CCPSF NPs) were synthesized in a controllable and one-step way under microwave-assisted conditions. The structure of CCPSF NPs was characterized by SEM images (for morphology and size distribution), TGA (for thermal stability), BET technique (for the specific surface area), FT-IR spectroscopy (for relation group characterization), and XRD patterns (for crystal size). The oxidation of the primary and secondary alcohols to aldehyde and ketone was investigated using synthesized CCPSF NPs under solvent-free microwave-assisted conditions, and high oxidizing activity was observed. In addition to oxidation properties, the anticancer activity of the synthesized CCPSF NPs in breast cancer was evaluated by the MTT method , and significant results were obtained.

C. Ribeiro A, Kolobova E, M. D. R. S. Martins L, A. C. Carabineiro S, German D, Pichugina D, Jiang C, J. L. Pombeiro A, Bogdanchikova N, Cortés Corberán V, Pestryakov A. Supported Gold Nanoparticles as Catalysts in Peroxidative and Aerobic Oxidation of 1-Phenylethanol under Mild Conditions

The efficiency of Au/TiO₂ based catalysts in 1-phenylethanol oxidation was investigated. The role of support modifiers (La₂O₃ or CeO₂), influence of gold loading (0.5% or 4%) and redox pretreatment atmosphere, catalyst recyclability, effect of oxidant: tert-butyl hydroperoxide (TBHP) or O₂, as well as the optimization of experimental parameters of the reaction conditions in the oxidation of this alcohol were studied and compared with previous studies on 1-octanol oxidation. Samples were characterized by temperature-programmed oxygen desorption (O₂-TPD) method. X-ray photoelectron spectroscopy (XPS) measurements were carried out for used catalysts to find out the reason for deactivation in 1-phenylethanol oxidation. The best catalytic characteristics were shown by catalysts modified with La₂O₃, regardless of the alcohol and the type of oxidant. When O₂ was used, the catalysts with 0.5% Au, after oxidative pretreatment, showed the highest activity in both reactions. The most active catalysts in 1-phenylethanol oxidation with TBHP were those with 4% Au and the H₂ treatment, while under the same reaction conditions, 0.5% Au and O₂ treatment were beneficial in 1-octanol oxidation. Despite the different chemical nature of the substrates, it seems likely that Au⁺(Au^δ+) act as the active sites in both oxidative reactions. Density functional theory (DFT) simulations confirmed that the gold cationic sites play an essential role in 1-phenylethanol adsorption.