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Density functional theory calculations on the cyclization of di-t-butyl 2-(2-aminophenyl)-2-methyl malonate (1) to t-butyl 3-methyloxindole-3-carboxylate (2) reveal that acetic acid-assisted protonation of the carbonyl oxygen atom reduces the activation Gibbs free energy significantly lower than methanol-assisted pathways. Experimental data confirm that reaction concentration plays a pivotal role in oxindole formation. Experimental results also indicate distinct reaction mechanisms at low and high concentrations. Achieving high enantioselectivity for chiral compound 2 in high-concentration reactions requires discovering a novel chiral acid.

Alkaline hydrolysis of the crude resin glycoside fraction from the leaves and stems of Ipomoea lacunosa L. (Convolvulaceae) yielded organic acid and glycosidic acid fractions. The organic acid fraction included n-decanoic and n-dodecanoic acids. Acidic hydrolysis of the glycosidic acid fraction yielded 3 monosaccharides (d-glucose, d-fucose, and l-rhamnose) and 2 known hydroxyl fatty acids (11S-hydroxytetradecanoic and 11S-hydroxyhexadecanoic acids). Treatment of the glycosidic acid fraction with trimethylsilyldiazomethane (in hexane) afforded 1 new glycosidic acid methyl ester (lacunosinic acid J methyl ester) and 6 known glycosidic acid methyl esters. Eight new resin glycosides (lacunosins V-XII) were isolated from the leaves and stems, along with 2 known resin glycosides. Their structures were determined using spectroscopic and chemical analyses. Three types of resin glycosides were identified: those with 18-membered macrolactone, those with 19-membered macrolactone, and those with non-macrolactone structures. All these compounds contained n-decanoic and n-dodecanoic acids as the organic acid components. Nine of the isolated resin glycosides were tested for cytotoxic activity against HL-60 human promyelocytic leukemia cells. One compound exhibited activity with an IC₅₀ value of 44.5 μM, while 3 compounds demonstrated moderate activity, with inhibition rates ranging from 53.5 to 68.7% at a concentration of 200 μM. In contrast, the remaining 5 compounds showed negligible effects even at 200 μM.

Cell-penetrating peptides (CPPs) hold great potential as tools for drug delivery systems (DDSs). Numerous research groups have developed novel CPPs with enhanced functionality and safety. This review highlights recent advancements in CPP research by my research group and our collaborators. We have designed novel CPPs incorporating unnatural amino acids, explored their applications in DDSs, and elucidated their functional mechanisms.

Therapeutic drug monitoring (TDM) is crucial for enhancing the effectiveness of pharmacological treatments. This study developed two types of two-dimensional (2D) chromatography systems. The primary column used a poly(N-isopropylacrylamide) (PNIPAAm) hydrogel-modified bead-packed column, while the secondary column employed either an octadecyl silyl (ODS) column or a PNIPAAm-terminally-modified column. The primary PNIPAAm-hydrogel-modified column effectively separated serum proteins and drugs, while the secondary ODS column exhibited a sharp peak owing to the drug concentration at the front of the column when an aqueous mobile phase was used. However, drug elution was slow, and the mobile phase required an organic solvent. By contrast, the column packed with PNIPAAm-terminally-modified beads reduced the analysis time, and organic solvent was unnecessary. These findings indicate that the developed two-column 2D chromatography system is advantageous for TDM. This system allows for the analysis of serum-drug samples without the need for sample preparation methods, such as deproteination. Moreover, drug concentration can be determined in a short analysis timeframe without organic solvents in the mobile phase.

This paper describes the first total synthesis and absolute configuration revision of biofloranate F, a biflorane-type diterpenoid isolated from the soft coral Lemnalia bournei. The synthesis involved an intramolecular Diels-Alder (IMDA) reaction to form the cis-fused decalin core. A key step was an Evans asymmetric alkylation to introduce an asymmetric center with high stereocontrol while guiding the stereoselectivity of subsequent steps, including the pivotal IMDA reaction. Although the spectroscopic data of the initially synthesized product matched those of the natural compound, its specific rotation was opposite. This discrepancy prompted us to synthesize its enantiomer, which exhibited identical characteristics to those of the natural product. Consequently, the absolute configuration of biofloranate F was unequivocally revised to 5S, 6R, 9S, 10R, and 11S.

This study investigates the influence of needleless versus needle-based electrospinning methods on the fiber diameter of polyamide 6 (PA6) nanofibers under comparable conditions, with an emphasis on potential pharmaceutical applications. Additionally, it examines how varying solvent systems impact fiber diameter specifically in needleless electrospinning. In this study, it was found that fibers produced by the needleless method were thicker compared to those produced by the needle-based method, a trend attributable to the specific solution characteristics and parameter settings unique to this study. Notably, a 2 : 1 acetic acid : formic acid solvent mixture yielded the largest fiber diameters among the solvent systems assessed for needleless electrospinning. These results underscore the potential of PA6 nanofibers in pharmaceutical applications, suggesting that further optimization of electrospinning conditions could enhance their suitability. The study also discusses the implications of scale-up production using needleless technology, highlighting its viability for industrial applications over single-needle electrospinning.

The wearing of medical gowns during anticancer drug preparation is recommended for the prevention of drug exposure. Non-breathable and breathable gowns (gown- and gown+, respectively) are both available. However, anticancer drugs may permeate "gown+." In the present study, water, hydrophilic and lipophilic dyes, and aqueous solutions of several model chemicals with different physical properties (pyridoxine, antipyrine, ethyl p-hydroxybenzoate, and butyl p-hydroxybenzoate) were applied to four types of gowns and their chemical permeabilities were measured. The permeability of gowns to vaporized ethanol was also investigated because several volatile anticancer drugs are currently used in the treatment of cancer. The results obtained showed that the hydrophilic chemical, pyridoxine, did not permeate any of the gowns tested. Furthermore, gowns became more permeable as the lipophilicity of chemicals increased. No significant changes were observed in the chemical permeability between "gown-" and "gown+," suggesting that the protective efficacy of the gowns against permeation by anticancer drugs was similar regardless of breathability. On the contrary, "gown + " was permeable to vaporized ethanol, whereas "gown-" was not. The present study demonstrates the need for safety measures in lipophilic or volatile anticancer drug handling and the importance of developing medical gowns that are highly resistant to chemical permeation.

In the present study, magnetic-calcined bamboo composite adsorbents (MCBC200, MCBC400, MCBC600, MCBC800, and MCBC1000) were prepared, and their physicochemical characteristics (scanning electron microscope images, differential thermogravimetric analysis, Fourier transform-IR, specific surface area, surface functional groups, and point of zero charge [pH_pzc]) were evaluated. Furthermore, the adsorption capacity of methylene blue (MB, cationic dye) using the prepared adsorbents was assessed. The value of pH_pzc and the specific surface area of MCBC400 were 7.8 and 50.6 m²/g, respectively. The amounts of acidic or basic functional groups of MCBC400 were relatively greater than those of the other adsorbents. The amount of MB adsorbed onto MCBC400 (31.9 mg/g) was higher than that onto other adsorbents. The adsorption of MB using MCBC400 was evaluated in relation to various parameters, including coexistence, solution pH, adsorption temperature, and contact time. The results followed the Langmuir isotherm model and a pseudo-second-order model with correlation coefficients of 0.980-1.000 and 0.996, respectively. MB was selectively adsorbed by MCBC400 in a binary solution system containing anionic dyes. Finally, one of the adsorption mechanisms was determined by analyzing the elemental distribution and the binding energy before and after the adsorption of MB. The current findings provide important information for removing MB with MCBC400 from the aqueous phase.