bluuebunny/crossref_metadata_2025_split huggingface dataset:
Biological synthesis and characterization of zinc oxide nanoparticles (ZnONPs) from Anisomeles malabarica
Authors: Sekar Alagan , Murugan Palaniyapillai Jothi , Paularokiadoss Francisxavier 
Published: March 2024

AbstractIn nanotechnology, the economic and ecological friendly synthesis of novel nanoparticles of natural structures particularly extracts of plant parts has come to be a rising field. The leaf extract of Anisomeles malabarica was used as a novel reducing agent to make zinc oxide nanoparticles (ZnONPs) from zinc acetate dihydrate. This study has been employed for two different concentrations of plant extract (1 and 3mL) as starting precursors. The formation of NPs was studied using X‐ray diffraction, UV‐visible, and Fourier transformed infrared spectroscopy. The size distribution and morphology of the synthesised nanoparticles were studied using scanning electron microscopy. The peak at 350 nm in the UV‐Vis spectra indicates its high excitation binding strength. The AFM study aimed to determine the shape and size distribution of nanoparticles, while FTIR studies confirmed the existence of biomolecules.
Preparation of injectable free‐HRP‐mediated and self‐catalyzed gelatin‐tyramine hydrogel for biomedical applications
Authors: Nguyen Ngoc Hao , Bui Quynh Anh , Dang Le Hang , Nguyen Dinh Trung , Tran Ngoc Quyen 
Published: March 2024

AbstractApproaches of synthesizing injectable hydrogels have drawn significant attention in several fields including drug delivery, tissue adhesion, and wound healing. Among them, injectable horseradish peroxidase‐mediated hydrogels have emerged as a prospective candidate in the development of biomedical materials. In the study, we prepared a hematin‐gelatin‐tyramine (HGT) polymer which could be exploited to prepare an injectable hydrogel in absence of Horseradish peroxidase (HRP). The chemical structure of HGT was characterized by UV‐Vis, 1H‐NMR spectroscopies. The HGT hydrogel could be formed in situ rapidly in presence of a small amount of H2O2 (3‐15 mM). Besides, HGT can catalyze pyrogallol and guaiacol like the enzyme HRP, and HGT has good biodegradability. Further studies on the biocompatibility of hydrogels will be investigated towards tissue regeneration.
Chemical constituents of marine sponge Ianthella basta (Pallas, 1766)
Authors: Hang Dan Thi Thuy , Thung Do Cong , Trang Do Thi , Yen Pham Hai , Cuc Nguyen Thi , Dung Duong Thi , Tai Bui Huu , Nhiem Nguyen Xuan , Van Kiem Phan 
Published: March 2024

AbstractPhytochemical study on the methanol extract of the elephant ear sponge Ianthella basta (Pallas, 1766) led to the isolation of one new (named lanthebastanoside A, 1) and nine known compounds, holothurin A2 (2), desulfoechinoside A (3), echinoside B (4), holothurin A (5), holothurin B (6), adenine (7), adenosine (8), thymidine (9), and thymine (10). The chemical structures of compounds 1‐6 were elucidated by extensive spectroscopic analyses including HR‐ESI‐MS, 1D and 2D NMR, and by comparison of the spectral data with those of previously reported data. Compounds 7‐10 were identified by 1H NMR data and comparing their retention times with authentic samples by HPLC analysis. This is the first report of compounds 2‐6 from marine sponge.
DFT investigations on conformational analysis, solvation effects, reactivity studies, chemical descriptors and docking of two anti‐cancerous drugs, Lenvatinib and Regorafenib
Authors: Al‐Otaibi Jamelah S. , Ullah Zakir , Mary Y. Sheena , Mary Y. Shyma , Soman Sreejit , Thirunavukkarasu M. , Kwon Hyung Wook 
Published: March 2024

AbstractTwo anticancer drugs, lenvatinib (LNTB) and regorafenib (RGFB) are evaluated for their solvent effects, wavefunction reactivity properties and different chemical descriptors by means of theoretical methods. Potential energy surface scan studies about all possible rotable bonds are performed and lowest energy conformations of LNTB and RGFB are for the torsion angles C25‐C24‐C29‐N9 and C25‐N10‐C15‐C21. Reactive sites are O and N, H atoms, giving nucleophilic and electrophilic attacks for both the molecules. Solvation free energies are calculated in different solvents and all solvents are suitble except heptane. Electron densities of LNTB and RGFB show that closed‐shell interactions are in different regions. The intramolecular hydrogen bonds of the compounds LNTB and RGFB are found at O2‐H38, Cl1‐H37 & O5‐H47 and F2‐H38, N11‐H45, O7‐H35 & O7‐H37, respectively. Due to anticancer activities, LNTB and RGFB are docked with different proteins which give binding affinities from ‐8.4 to ‐10.5 for RGFB and ‐7.9 to ‐10.1 kcal/mol for LNTB.
A review of silver‐dopped graphene oxide nanocomposite: Synthesis and multifunctional applications
Authors: Thinh Doan Ba , Dat Nguyen Minh , Tuyen Nguyen Ngoc Kim , Tai Le Tan , Hai Nguyen Duy , Tinh Ninh Thi , Huong Le Minh , Do Dat Tran , Huong Quach Thi Thanh , Nam Nguyen Thanh Hoai , Oanh Doan Thi Yen , Phong Mai Thanh , Hieu Nguyen Huu 
Published: March 2024

AbstractIn recent years, the applications of nanomaterials are getting more common in commercial products. Amongst them, silver nanoparticles (AgNPs) are the most well‐known nanomaterials for their outstanding antibacterial properties and potential applications in the biomedical field. The agglomeration of AgNPs due to their high surface energy has diminished the actual antibacterial applications of these plasmonic nanoparticles. To tackle this problem, the AgNPs are grafted onto graphene oxide (GO) sheets (Ag/GO) to minimize the agglomeration of AgNPs and enhance the extraordinary antibacterial characteristics of AgNPs thanks to several outstanding features of GO. Ag/GO composite also exhibits other properties such as good optical sensitivity to trace heavy metal ions, adsorption affinity, and catalytic activity for the removal of organic compounds. With all the possibilities, Ag/GO can be considered a multifunctional nanocomposite that can be applied in various fields such as biomedical treatment and environmental remedy.
Enhancing radical scavenging activity of Cordyceps militaris extract by gamma irradiation
Authors: Quynh Tran Minh 
Published: March 2024

AbstractNowadays, irradiation treatment has been well‐known as an effective tool to eliminate the pathogenic and spoilage microorganisms existing in foods and food ingredients in order to ensure their hygiene and extend their shelf‐life. In the present study, the dried fruiting bodies of Cordyceps militaris were irradiated under gamma source at Hanoi Irradiation Center, then extracted to collect crude polysaccharides and to evaluate the effects of gamma ray on antioxidant properties and functional groups of bioactive components in the extract (CME). Our preliminary results showed the antioxidant ability of CME, which is presented by DPPH radical scavenging activity, increased with concentration and radiation dose. The concentration required to induce 50 % antioxidant activity or median inhibition concentration (IC50) of CME decreased with radiation dose, and the smallest SC50 obtained with the CME irradiated at 15 kGy. These results suggested that the antioxidant capacity of CME can be much improved by irradiation. However, gamma radiation insignificantly affected the functional groups of CME as analyzed with Fourier transform infrared (FT‐IR) spectroscopy although the intensities of some characteristic peaks were distorted by high dose radiation.
Phenolic glycosides from the peels of durian fruits Durio zibethinus L.
Authors: Cuong Dang Viet , Hanh Tran Thi Hong , Huong Nguyen Thi , Huong Pham Thi Mai , Quang Tran Hong 
Published: March 2024

AbstractIn the present study, six phenolic glycosides, including one new durianol F (1) and five known compounds, durianol A (2), syringaresinol glucoside (3), 4‐O‐β‐glucopyranosyl sinapic acid methyl ester (4), quercetin‐3‐glucopyranoside (5), and quercetin‐3‐rhamnopyranoside (6) were isolated from a methanol extract of the peels of durian fruits (Durio zibethinus). Their chemical structures were elucidated using the NMR and MS spectroscopic analyses and comparision with the previously reported values. In addition, their cytotoxic effect against three human carcinoma cell lines, including liver (HepG2), breast (MCF7), and lung (SK‐LU‐1) was also evaluated.
Co2+ and Cr3+ ions removal from wastewater by using nanostructural hydroxyapatite
Authors: Phuong Nguyen Thu , Thom Nguyen Thi , Nam Pham Thi , Van Trang Nguyen , Huong Tran Thi Thu , Hai Do Thi , Thu Le Phuong , Osial Magdalena , Thanh Dinh Thi Mai 
Published: March 2024

AbstractDue to the growing pollution of the environment, water purification methods have to be improved. One of the most effective solutions is the removal of heavy metal ions by porous materials, including hydroxyapatite. Lao Cai Province in Vietnam has a tremendous reservoir of apatite ore that can be a precursor for nanostructural materials. In this paper, we refer to the recent studies on removing heavy metal salts, including the cobalt and chromium ions, from the wastewater by the nanostructural hydroxyapatite obtained from the apatite ore gained in the Lao Cai Province. The measurements were performed according to the pH, mass of the adsorbent addition into the real wastewater solution, and time exposition onto the adsorbent; and the suitable condition is a dose of modified apatite of 1 g/L; contacting time of 60 minutes and 6 g/L and 15 minutes in the pH range from pH0 (3.76 and 6.57) to neutral pH corresponding to Cr3+ and Co2+. We show that just a small amount of the nanostructural hydroxyapatite can work efficiently to remove the chromium and cobalt ions from the solution with maximum adsorption capacity is 70.37 mg/g and 13.52 mg/g, respectively.
Green synthesis of pectin‐silver nanocomposite: Parameter optimization and physico‐chemical characterization
Authors: Nhi Tran Thi Y , Thien Do Truong , Cong Trinh Duc , Tung Ngo Trinh , Thuy Lai Thi , Thuc Nguyen Thi , Nu Tran Thi , Dat Nguyen Dang , Hileuskaya Kseniya , Kalatskaja Joanna , Kulikouskaya Viktoryia 
Published: March 2024

AbstractIn our present reports, an eco‐friendly approach of green‐synthesis of silver nanoparticles without using any toxic reducer or organic solvent was investigated. Pectin, a biopolymer, was used both as a reducing agent and a stabilizer. Response surface methodology (RSM) was carried out with four parameters: pectin concentration, AgNO3 concentration, temperature, and time to obtain the minimum mean particle size of silver nanoparticles (response Y). The optimal conditions were pectin concentration of 1.64 mg/ml, silver nitrate of 3.26 mM, temperature of 36.6°C and time of 9.6 h. A silver particle size of 6.82 nm was obtained by Design Expert Software and silver particle size obtained experimentally was 6.62 nm. The physico‐chemical properties of the pectin‐silver nanocomposite were characterized by combined techniques including visible ultraviolet spectroscopy (UV‐Vis), dynamic light scattering (DLS), transmission electron microscopy (TEM), infrared spectra (IR), and X‐ray diffraction.
Ethanolic extract of Chrysophyllum albidum leaves and peels as a green inhibitor for AISI 1015 carbon steel in 1M H2SO4 solution
Authors: Dauda K. T. , Owoeye T. F. , Fayomi O. S. I. , Akande I. G. 
Published: March 2024

AbstractThe degradation of mild steel has been an issue of concern in most industries. Because of this challenge, mild steel (AISI 1015 carbon steel) was inhibited using ethanolic extract from leaves and peels of Chrysophyllum albidum (C. albidum) in 1 M H2SO4 was investigated using gravimetric (weight loss), gasometric and potentiodynamic polarization (PP) methods. Samples of mild steel were placed in an acidic medium and tested at different concentrations of extract. The PP experiment indicated that the inhibition efficiency (I.E) of C. albidum ranges from 70.9‐85.9 % and 54.6‐89.1 %, for leaves and peels extract, respectively. The I.E increases with increase in concentration of the extracts due to the adsorption of their molecules on the mild steel surface. The leaves and peels 1.5 g/L extract inhibited mild steel sample exhibited a significant corrosion rate of 0.0821 mm/year and 0.0635 mm/year, respectively. The inhibitors exhibited mixed‐type corrosion inhibition tendencies. Moreover, the weight loss test revealed that the inhibitors lower the corrosion rate of the steel samples. The adsorption ability of the extracts was approximated through the Langmuir isotherm. The correlation regression coefficients (R2) values of 0.9960 and 0.9981 were observed for the leaves and peels extracts, respectively. This study has shown that C. albidum extracts reduced the rate at which mild steel corrodes in an acidic medium. It is therefore recommended for application in acidic media.
A new lignanamide from the stems of Derris elliptica (Wall.) Benth with antimicrobial and anti‐inflammatory activities
Authors: Trang Bui Thi Thu , Huong Phan Thi Thanh , Anh Nguyen Tuan , Huong Nguyen Thi , Linh Nguyen Thi Thuc , Van Kiem Phan , Nhiem Nguyen Xuan 
Published: March 2024

AbstractA new lignanamide, named derristicine A (1), together with ten known compounds, dalbin (2), wistin (3), 3,5‐dimethoxy‐4‐hydroxy‐1‐O‐β‐D‐glucopyranoside (4), 3,4,5‐trimethoxyphenyl‐1‐O‐(4′‐sulfo)‐β‐D‐glucopyranoside (5), vanillic acid glucosyl ester (6), (9R)‐roseoside (7), (9S)‐roseoside (8), pumilaside A (9), (8R,8′R)‐secoisolariciresinol‐9‐O‐β‐D‐glucopyranoside (10), and (8S,8′S)‐secoisolariciresinol‐9‐O‐β‐D‐glucopyranoside (11) were isolated from Derris elliptica (Wall.) Benth stems. Their chemical structures were determined by analysis of HR‐ESI‐MS, NMR spectral data, as well as comparison with previous reports. Compounds 2‐3, 5‐8, and 10 showed potential inhibitory effect on the growth of Candida albicans strain with a MIC value of 37.5 μM. Compounds weakly inhibited NO production in LPS activated RAW264.7 cells.
Polymer and composite based thermoelectrics: Basics, scopes and issues
Authors: Mondal Sourav , Dhak Debasis , Saha Bidyut 
Published: March 2024

AbstractLow thermal conductivity of polymeric materials along with their ability for nonconventional process ability, light weight, and flexibility makes them possible candidates for low‐power thermo electrical applications. However, it requires the development of both Seebeck coefficient and electrical conductivity simultaneously. This viewpoint addresses some of the concepts in the literature to reach this by taking into consideration the intricacies and interconnectivities of diverse thermoelectric parameters. Particularly, the applicability of the Wiedemann–Franz rule as well as DOS engineering by combination two semiconductors, suitable in inorganic, is reviewed for polymeric systems. One of the major advantages of polymeric semiconductors is that their thermal conductivity is mostly phononic (lattice thermal conductivity) and remains low with increasing charge carrier concentrations, as needed for TE applications. The momentum in polymer artificial strategies has to be joined with the studies on doping effectiveness and doping mechanisms to overcome the bottlenecks in polymeric thermoelectric.
Synthesis of TiO2‐doped carbon aerogel from sugarcane bagasse for high efficiency of photodegradation of methylene blue in the water
Authors: Lin Tong Hoang , Thang Tran Quoc , An Hoang , Hai Nguyen Duy , Duy Pham Hoang Anh , Duyen Dang Thi My , Oanh Doan Thi Yen , Van Tuyen Ngo , Nam Hoang Minh , Phong Mai Thanh , Hieu Nguyen Huu 
Published: March 2024

AbstractIn this work, TiO2‐doped carbon aerogel (TiO2/CA) was synthesized from sugarcane bagasse hydrothermal, freeze‐drying, and carbonization methods. The effects of the calcination temperatures of 400, 500, 600, 700, and 800 °C were also evaluated. The obtained TiO2/CA exhibits an ultralow density (0.021‐0.032 g/cm3) and porosity of more than 97 %. The as‐prepared TiO2/CA was applied in photodegradation of methylene blue (MB) with the effects of dose sample and pH were also investigated. The results show that TiO2/CA at 800 °C (TiO2/CA‐800) exhibits the highest MB photodegradation efficiency of 93.86 % at pH 9. The aforementioned results affirm the potential application of sugarcane bagasse for the fabrication of environmentally friendly and low‐cost adsorbents for the photodegradation of MB.
Kinetic and equilibrium studies on bioadsorption of copper and lead by water hyacinth (Eichhornia crassipes) plant powder
Authors: Hazarika Linton , Shah Kishor Kr. , Baruah Gitali , Bharali Ranjan Kr. 
Published: March 2024

AbstractCommon water hyacinth plant (Eichhornia crassipes) found in various water bodies in Assam, India, was used as bioadsorbent for removal of toxic metals (Cu and Pb) from synthetic medium. The functional groups present in the bioadsorbent, water hyacinth plant powder (WPP) were determined by using Fourier transform infra red spectroscopy (FTIR) and surface topography by scanning electron microscopy (SEM) technique. The specific surface area of WPP was also determined. The optimum adsorption properties of WPP was determined by considering pH, agitation time, metal concentration, temperature and the amount of adsorbent. The adsorbent showed good adsorption of toxic metal, Cu and Pb from synthetic medium. Water hyacinth plant was used to treat ten synthetic mediums containing 40, 50, 60 70 and 80 mgL‐1 of the two heavy metals, Cu and Pb. From the batch study, it was observed that the adsorption mechanism for the studied metals follow the 2nd order kinetics and the isotherm study showed that Langmuir model is suitable for explaining the adsorption equilibrium data for bioadsorption of Cu2+ and Pb2+ ions on WPP. For Cu(II) adsorption on WPP, the maximum adsorption was observed at pH 7 while for Pb(II), the maximum adsorption was observed at pH 5.
Highly Selective and Sensitive Dual Channel New Schiff base Chemosensor based on 5‐bromo‐2‐hydroxybenzaldehyde and its Co(II), Ni(II), Cu(II) and Zn(II) Complexes ‐ Synthesis, Spectral and Theoretical characterization and Pharmacological applications
Authors: Santhi Sambamoorthy , Renganathan Rajalingam , Amala Subbiah , Suganya Gobalakrishnan , Abinaya Karikalan 
Published: March 2024

AbstractA new Schiff base N,N’‐Bis(5‐Bromosalicylidine)‐1,8‐diaminonaphthalene (BBSDN) and its Co(II),Ni(II),Cu(II) and Zn(II) complexes were synthesized. All the compounds were characterized by various spectral studies (IR, UV, 1H NMR, 13C NMR and EI‐Mass) and DFT calculations. Conductance measurements, magnetic study and metal estimation studies were performed for the complexes to establish the structure. Thermal studies were done to account for the coordination of water molecules. Redox property of the synthesized complexes was established by Cyclic Voltammetry studies. Synthesized compounds were screened against fungal and bacterial pathogens and in most of the cases the complexes were found to be more active than the Schiff base. MIC value for copper and zinc complexes against the fungal pathogen Candida albicans are determined as 25 ppm and 10 ppm respectively. Metal ion pertinency of the Schiff base was investigated by absorption and fluorescence methods and was found to be highly selective and sensitive for the detection of Cu(II) ion. Mode of interaction has been proved through 1H NMR titrations and the interaction is explained as due to CHEQ mechanism. Stability constant of the complex formed during the detection process was determined by Benesi‐Hildebrand plot. Detection limit was computed as 1.464×10‐6M. The chemosensor property of the Schiff base is applied in bioimaging studies on HeLa cell lines.
Flavonoids and other constituents of plants from the genus Knema (Myristicaceae) and their pharmacological studies: An updated review
Authors: Salihu Abubakar Siddiq , Salleh Wan Mohd Nuzul Hakimi Wan 
Published: March 2024

AbstractFlavonoids are a diverse group of natural compounds extensively studied in various research articles. They are widely distributed in the plant kingdom and exhibit various biological activities, including antioxidant, anti‐inflammatory, anticancer, antiviral, and antimicrobial effects. The genus Knema Lour., which contains many species in Southeast Asia, has been traditionally used to treat various ailments. The current review aims to provide a comprehensive update on the isolation of flavonoids and other secondary metabolites from the genus Knema Lour. between 1978 and 2022. It also discusses the pharmacological studies on these phytochemicals, including their effects on nematodes, bacteria, cytotoxicity, inflammation, and acetylcholinesterase. Through these years, 50 flavonoids have been reported from various species of Knema demonstrating promising pharmacological activities. The information presented in this review can provide a scientific foundation for future research on the possible therapeutic applications of Knema species. It also links the plants’ observed biological effects and traditional uses to their chemical characterization. The data was retrieved from various digital databases, including ScienceDirect, Web of Science, Scopus, Wiley, Taylor and Francis, PubMed, Springer, and Google Scholar.
Review: Natural rubber – Improvement of properties
Authors: Dieu Tran Vinh , Chuong Bui , Hung Dang Viet , Tung Nguyen Huy , Linh Nguyen Pham Duy , Oanh Doan Thi Yen 
Published: March 2024

AbstractNatural rubber (NR) is valuable material of natural origination with growing demand worldwide. Thus, the methods for NR property improvement are continuously developed. The article will be focused on methods of chemical modification of NR and the use of improved traditional fillers such as carbon black (CB) and silica. Modification reactions include epoxidation, hydrogenation, and grafting vinyl monomers onto NR molecules. Some methods of surface modification of NR film were also reviewed. Thanks to modification the NR degree of unsaturatiton is decrease that leads to its enhanced aging resistance. Besides, grafted functional groups may impart new, never met before properties to NR. Application of modified traditional fillers obviously increase their reinforcement possibility, particularly mechanical. Also, cellulose as a potential reinforcing filler is considered due to its ability to meet requirement of environment protection while keep the mechanical properties of NR products at acceptable high level.
A review on characterization of carbon quantum dots
Authors: Rooj Bipin , Mandal Ujjwal 
Published: March 2024

AbstractCarbon quantum dots (CQDs) are a new blooming carbon containing nanoparticles having size of less than 10 nm. They have wide range of application in the field of sensing of inorganic analytes, bio sensing, cell imaging, studying biological processes in living cells and also for drug delivery. These nanoparticles of carbon are playing important roles due to their interesting qualities like small particle size, biocompatibility, fluorescing, etc. Sometimes it shows excitation wavelength dependent, which may be more than 100 nm, and sometimes excitation wavelength independent fluorescent property. CQDs are highly photo stable (stable for hours), compared to the conventional fluorescent semiconductor quantum dots. To apply such carbon quantum dots, it is necessary to characterize the CQDs first. Most of the time they are characterized by photophysical and structural property using UV‐VIS spectroscopy, fluorescence spectrophotometry, FT‐IR, XRD, XPS, Raman spectroscopy, TCSPC, HRTEM, etc. In this review article we demonstrate how these tools are used to characterize newly synthesized CQDs, monitor the synthesis process along with finding its application in numerous fields.