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Dietary fibers are a major source of short-chain fatty acids (SCFAs) in the body, and the fermentation products of SCFAs induced by intestinal microbiota affect energy metabolism. Apart from serving as an energy source in the intestines, SCFAs also inhibit autophagy, nucleotide-binding oligomerization domain-containing protein, LRR, and pyrin domain-containing protein 3 inflammasome. SCFAs provide numerous therapeutic benefits through their influence on cognitive functioning and neurodegenerative diseases (NDD) pathophysiology. Additionally, NDDs are associated with abnormalities in the gut microbiota, including an increased load of pathogens and opportunistic microbes. SCFAs maintain the healthy mitochondrial function and stimulate the maturation of microglia, which consequently suppresses the progression of NDD and cognitive decline by regulating inflammation and oxidative stress. Basically, SCFAs function as cofactors for the host's mitochondrial enzymes and are being studied for their ability to reverse the alteration in the gut microbiota seen in many NDDs and cardiac diseases. In the present review, the focus is on the detrimental and beneficial roles of SCFAs in NDD, emphasizing the effects of SCFA on following phenomenon: (1) alteration in gut microbiota profile associated with NDD, (2) the molecular mechanism of metabolic regulation by SCFA's, and its co-relation with NDD, (3) use of mitochondrial antioxidants as a strategy for maintaining microbiota diversity in the gut, and (4) the future direction of metabolism and neurodegeneration in the gut–brain axis. In addition, the interplay between gut microbiota, SCFAs, epithelial barrier, and neuroimmune signaling in neurodegeneration has been reviewed. The current systematic review and meta-analysis indicate that dietary fermentation of nondigestible fibers leads to the production of short chain fatty acids (SCFAs) by gut microbiota. Moreover, they directly act on the central nervous system and inhibit the progression of different neurodegenerative diseases such as Parkinson disease, Alzheimer disease, and multiple sclerosis. SCFAs act by triggering cellular antioxidants and inhibiting inflammation. The properties of SCFAs depend on the G protein–coupled receptors, histone deacetylases and peroxisome proliferator-activated receptor gamma, and regulatory T-cell activation. [Display omitted] [ABSTRACT FROM AUTHOR]

• Single-layered 2D nanosheets of α-ZrP were obtained through exfoliation. • Free amine groups were covalently attached to the single-layered α-ZrP nanosheets. • AF-ZrP shows an extraordinarily high adsorption capacity for Pb2+ and Congo red dye. • Non-linear regression methods are more accurate compared to linear methods. This paper reports a facile route for preparing single-layered and crystalline 2D nanosheets of α-zirconium phosphate (α-ZrP), which were further functionalized through covalent attachment of amino organosilane on its exfoliated surfaces (AF-ZrP) to enhance their sorption capacity for Pb2+ and Congo red removal. Two possible surface arrangements of NH 2 groups were observed: one as free amine groups without bonding and the other as protonated or hydrogen-bonded amine groups. AF-ZrP exhibits extraordinary adsorption capacities of 1640 and 1213 mg g−1 for removing Pb2+ ions and CR dye. Further, linear and non-linear regression methods have been studied and compared for fitting four adsorption isotherm models and two kinetics models. Non-linear Freundlich isotherm and non-linear pseudo-second order kinetic models prove the most suitable. The high adsorption capacity, easy regeneration, and reusability rendered AF-ZrP a suitable adsorbent for removing Pb2+ ions and Congo red (CR) dye at industrial scale. [ABSTRACT FROM AUTHOR]

Electrolytic water splitting is the most effective approach for the production of oxygen and hydrogen as it uses water as a feedstock which is non-toxic, green, and inexpensive. Hydrogen generation by electrolysis of water is an important process for the production of renewable energy resources. The high cost, less abundance, poor stability, and carbon monoxide poisoning of currently used noble metals as electrocatalyst is the bottleneck of this technology. These limitations can be conquered by using transition metal phosphates. In particular, cobalt phosphate-based materials show favorable performance and stability for electrolytic water splitting. Furthermore, cobalt phosphates in combination with semiconductors act as a co-catalyst in solar water oxidation. The variable oxidation state of cobalt is beneficial for fast electron transfer. The phosphate group due to its unique lattice structure helps in the adsorption and dissociation of water on the surface of the electrode. This review will provide a brief outline of the structure and activity relation between cobalt phosphate-based materials. The electrocatalytic applications of these materials in water oxidation, hydrogen generation, and overall water splitting have also been discussed. The role of cobalt phosphate-based materials in water splitting using solar radiation is thoroughly explained. In the end, a diverse range of synthesis methods, challenges, and future prospects have been presented. [ABSTRACT FROM AUTHOR]

[Display omitted] • Efficient conversion of CO 2 is crucial for eco-friendly and sustainable catalysis. • Cycloaddition of CO 2 with small member ring generates important organic compounds. • Metal phosphonates are the rising star for highly efficient catalysis. • The ultrahigh stability of metal phosphonates provides a versatile platform. The efficient conversion of CO 2 into valuable products at ambient conditions is crucial for eco-friendly and sustainable catalysis. Designing a competent and novel catalytic system demands profitable utilization of CO 2 to alleviate the global warming caused by the unrestricted use of fossil fuels, industrialization, and other human activities. Metal phosphonates are the rising star for highly efficient catalysis. Several studies prove their potential for CO 2 cycloaddition, but relevant research is relatively scarce. This review demonstrates recent achievements of metal phosphonates research, from a wide range of synthesis approaches for incorporating different organic functionalities and controlling porosity to their application as heterogeneous catalysts for the chemical conversion of CO 2. A systematic study of their catalytic performance, the mechanism for CO 2 coupling with aziridines and epoxides, and challenges and prospects will be explained. [ABSTRACT FROM AUTHOR]

Consumption of Cassia occidentalis (CO) seeds, a ubiquitously distributed weed plant, is responsible for a pathological condition known as hepato-myo-encephalopathy (HME). The toxicity of CO seeds is largely attributed to the presence of anthraquinones (AQs). Here, we report that Emodin, a CO anthraquinone, inhibits the enzymatic activity of NADPH-Quinone reductase, which is an intracellular enzyme fundamentally involved in the detoxification of quinone containing compounds. Emodin binds to the active site of the enzyme and acts as a competitive inhibitor with respect to 2, 6-Dichlorophenolindophenol, a known substrate of NADPH-Quinone reductase. Moreover, our in-vitro study further revealed that Emodin was cytotoxic to primary rat hepatocytes. Image 1 • Emodin, Aloe-emodin and Rhein are the anthraquinones present in Cassia occidentalis. • Emodin showed the highest binding energy with reduced nicotinamide adenine dinucleotide phosphate-Quinone reductase enzyme. • Binding interactions of Emodin with the enzyme was almost similar to 2, 6-dichlorophenolindophenol. • Emodin reduced the specific activity of the enzyme by acting as a competitive inhibitor. • Emodin reduced the viability of rat primary hepatocytes at 50 μM concentration. [ABSTRACT FROM AUTHOR]

Consumption of edible oils contaminated with Argemone oil (AO) leads to a clinical condition called “Epidemic dropsy”. Earlier studies have reported that metabolism and oxidative stress primarily contributes to AO toxicity, however, the involvement of immune system has not been assessed so far. Therefore, the present study was undertaken to systematically assess the effect of AO exposure on the function of immune system in Balb/c mice. The repeated exposure of AO for 28 days caused prominent regression of spleen and thymus; severe inflammatory changes in spleen depicted by the loss of distinct follicles, increased megakaryocyte infiltration, and enhanced expression levels of inflammatory markers (iNOS & COX-2). At the functional level, AO exposure significantly abrogated the mixed lymphocyte reaction and mitogen-stimulated lymphoproliferative activity of T and B cells, which is reflective of profound lymphocyte dysfunction upon antigen exposure. In concordance with the loss in functional activity of lymphocytes in AO exposed animals, it was found the AO altered the relative percentage of CD3 + , CD4 + , and CD28  +  T cells. Further, there was a marked decrease in the relative distribution of cells with prominent MHC I and CD1d expression in AO exposed splenocytes. Moreover, reduced levels of immune stimulatory cytokines (TNF-α, IFN-γ, IL-2, IL-4, and IL-6), and increased levels of immunosuppressive cytokine IL-10 were detected in the serum of AO treated mice. Along with T and B cells, AO exposure also affected the phenotype and activation status of macrophages suggesting the inclination towards “alternative activation of macrophages”. Altogether, these functional changes in the immune cells are contributing factors in AO induced immunosuppression. [ABSTRACT FROM AUTHOR]