Direct Oligosaccharide Profiling Using Thin-Layer Chromatography Coupled with Ionic Liquid-Stabilized Nanomatrix-Assisted Laser Desorption-Ionization Mass Spectrometry.

The in-depth characterization of glycan structures is crucial to understanding their structure-function relationships and their effects on health and various diseases. Despite advances in rapid analysis, the utility of matrix-assisted laser desorption/ionization mass spectrometry (MALDI MS) is limited for complex mixtures of carbohydrates due to their low ionization efficiency and the difficulty in separating oligosaccharides because of their high structural similarity. In this study, we developed an ionic liquid (IL)-stabilized, nanomatrix-decorated, thin-layer chromatography (TLC)-MALDI MS method for simultaneous and rapid separation, detection, and identification of oligosaccharides to achieve efficient profiling. The IL demonstrated good dispersion and stabilization for the spin coating of dihydroxybenzoic acid-functionalized magnetic nanoparticles (DHB@MNPs) on the TLC plate with spot homogeneity, which contributed to the observed high reproducibility (<20% CV) and 12- and 28-fold signal enhancement. Although the TLC was not able to separate isomeric glycans, the DHB@MNPs generate diagnostic glycosidic and cross-ring cleavage ions, enabling on-spot structural elucidation of composition, sequence, branching, and linkage of glycans in each separated spot. Without chemical derivatization of glycan samples, glycan visualization by TLC and tandem MS, our integrated platform, allowed the identification of 25 oligosaccharides from human milk, and heatmap analysis revealed the variability in the oligosaccharide abundance in samples from individual donors at different lactation times, which may provide insight into the microbiota and immunity of infants. With the demonstrated simplicity of our sample preparation method along with the achieved separation and in-depth structural characterization, our approach can be used for the rapid screening of other oligosaccharide-rich samples.

Ginger (Zingiber officinale)-Mediated Green Synthesis of Silver-Doped Tin Oxide Nanoparticles and Evaluation of Its Antimicrobial Activity.

Green synthesis of nanoparticles using plant extract is a novel development that has gained significant attention because of its low cost, nontoxicity, and environmental friendliness. In the present study, silver-doped stannic oxide (Ag-doped SnO2) nanoparticle was synthesized by an eco-friendly green synthesis method. The synthesized samples were characterized using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), ultraviolet-visible spectroscopy (UV-vis), X-ray diffraction (XRD), and their antimicrobial activities were assessed against two bacteria Escherichia coli (E. coli) and Staphylococcus aureus (S. aurus) and two fungi Fusarium oxysporum (F. oxysporum) and Fusarium graminearum (F. graminearum) by using the disk diffusion method. Ag-doped SnO2 nanoparticles show a strong and broad absorption from UV-vis spectra when compared to pure SnO2 nanoparticles. FTIR spectral analysis revealed that the peak at 505.69 cm-1 was assigned to Sn-O and O-Sn-O stretching vibration of SnO2 nanoparticles. XRD analysis confirmed the formation of a tetragonal rutile structure with average particle size ranging from 10 to 17 nm. The antimicrobial result indicates that the Ag-doped SnO2 revealed significant antimicrobial activity against both bacterial and fungi strains with the zone of inhibition of 29 ± 0.54, 27 ± 0.05, 17 ± 0.05, and 15 ± 0.05 mm for S. aureus, E. coli, F. oxysporum , and F. graminearum, respectively. Thus, the studies suggested that Ag-doped SnO2 nanoparticles exhibit good activity against both Gram-negative and Gram-positive bacteria and fungi. This is because doping SnO2 nanoparticles with metallic elements such as Ag has been used to enhance their performance, confirming them as a good candidate for antimicrobial agents and the development of future therapeutic agents.

Pharmaceutical and drug delivery applications of chitosan biopolymer and its modified nanocomposite: A review.

Due to their improved structural and functional properties as well as biocompatibility, biodegradability, and nontoxicity, chitosan and its nanoparticles are currently grasping the interest of researchers. Although numerous attempts have been made to apply chitosan and its derivatives to biological applications, few have reported in achieving its pharmacological and drug delivery. The goal of the current work is to provide a summary of the chitosan biopolymer's physical, chemical, and biological properties as well as its synthesis of nanoparticles and characterization of its modified nanocomposites. The drug delivery method and pharmaceutical applications of chitosan biopolymer and its modified nanocomposites are examined in further detail in this research. We will introduce also about the most current publications in this field of study as well as its recent expansion.

Time to recovery and its predictors among COVID-19 positive patients admitted to treatment centers of Southwestern Ethiopian hospitals. A multicenter retrospective cohort study.

Background: Nowadays, coronavirus disease is a leading cause of death. Therefore, the study aimed to assess the time to recovery and its predictors among Covid-19 positive patients. Methods: A hospital-based retrospective cohort study was conducted among 300 COVID-19 patients admitted to Southwestern Ethiopian hospital COVID-19 treatment centers from August 7, 2020 to February 7, 2022. Kaplan Meier was used to estimate the survival time and the Log-rank test was used to compare the survival time between groups of categorical variables. The multivariable survival regression model was used to identify a significant predictor of time to recovery among COVID-19 patients at a P value â©½ 0.05 with a 95% CI. Result: In this study, 92% of patients admitted to Jimma University COVID-19 treatment center and Mettu Karl Comprehensive Specialized Hospital COVID-19 treatment center were recovered from COVID-19 after a maximum of 33 days of follow-up. The overall incidence density was 11.99/100 PD (person day) with a 95% CI of [11.273, 12.719] per 100 PD after a total of 3452 PD observations. The median time of recovery from COVID-19 was 10 days. Age (AHR = 1.945, 95% CI: 1.157, 3.268), hypertension (AHR = 1.856, 95% CI, 1.30, 2.63), diabetes (AHR = 1.406, 95% CI, 1.05, 1.84), being critical (0.298, 2039, 0.434), cancer (AHR = 3.050, 95% CI, 1.172, 7.943), and tuberculosis (AHR = 2.487, 95% CI, 1.504, 4.110) were found to be independent predictors of time to recovery of COVID-19 patients. Conclusion: A total of 92% of patients were recovered within 10 days of the median time. Age, hypertension, diabetes mellitus, tuberculosis, severity of the case, cancer, and the presence of acute kidney injury were predictors of recovery time of COVID-19 patients. Therefore, healthcare providers should give strict follow-up and priority to elderly patients with chronic illnesses and those under supportive care.

Chitin and chitosan production from shrimp shells using ammonium-based ionic liquids.

Ammonium-based ionic liquids (ILs): diisopropylethylammonium acetate ([DIPEA][Ac]), diisopropylethylammonium propanoate ([DIPEA][P]) and dimethylbutylammonium acetate ([DMBA][Ac]) are used for the extraction of chitin from shrimp shells. The extracted chitins were characterized by FT-IR, TGA, XRD, SEM and 1H NMR. The yield of chitin, with moderate molecular weights, can be as high as 13.4% (mass of extracted chitin/mass of shrimp shells) when the extraction was operated at 110 °C for 24 h. The extracted chitin can be further converted into chitosan and the product has 93% degree of deacetylation. The experimental results reveal that the ILs play a remarkable role in the extraction of chitin from shrimp shells with high selectivity. These ammonium-based ILs can be a promising green solvent to extract chitin from wasted shrimp shells and then converted into chitosan.

Treatment of Coffee Husk with Ammonium-Based Ionic Liquids: Lignin Extraction, Degradation, and Characterization.

Four ammonium-based ionic liquids were synthesized for the selective extraction and degradation of lignin from coffee husk. The extracted lignin samples were characterized by Fourier transform infrared, gel permeation chromatography, gas chromatography-mass spectrometry, UV-vis, 1H and 13C NMR, heteronuclear single-quantum coherence-NMR, thermogravimetric analysis, X-ray diffraction, and field emission scanning electron microscopy analyses. The analyzed results confirmed that these ionic liquids are able to effectively extract and decompose the lignin to smaller molecules from the biomass. Experimental results show that a significantly high yield, 71.2% of the original lignin, has been achieved. This processing method is an efficient, economical, and environmentally friendly green route for producing high-added-value lignin from wasted coffee husk.