Hydroxyapatite–bioglass nanocomposites: Structural, mechanical, and biological aspects

• Olga Shikimaka,
• Mihaela Bivol,
• Bogdan A. Sava,
• Marius Dumitru,
• Christu Tardei,
• Beatrice G. Sbarcea,
• Daria Grabco,
• Constantin Pyrtsac,
• Daria Topal,
• Andrian Prisacaru,
• Vitalie Cobzac and
• Viorel Nacu

Beilstein J. Nanotechnol. 2022, 13, 1490–1504, doi:10.3762/bjnano.13.123

• dissolved in isopropanol (StanChem, Poland). The absorbance was measured at 570 nm with a spectrophotometer (Synergy H1, BioTek). Results and Discussions XRD analysis XRD analysis showed that, for all composites, HA decomposes partially or fully into tricalcium phosphate (Ca3(PO4)2, TCP) during sintering. A

Rapid and sensitive detection of box turtles using an electrochemical DNA biosensor based on a gold/graphene nanocomposite

• Abu Hashem,
• M. A. Motalib Hossain,
• Ab Rahman Marlinda,
• Mohammad Al Mamun,
• Khanom Simarani and
• Mohd Rafie Johan

Beilstein J. Nanotechnol. 2022, 13, 1458–1472, doi:10.3762/bjnano.13.120

• was isolated using a DNA extraction kit (Favorgen Biotech Corp, Taiwan) following manufacturer instructions. A UV–vis spectrophotometer (NanoPhotometer Pearl, Implen GmbH, Germany) was used to assess the extracted DNA content and purity at an absorbance of 260 nm and at an absorbance ratio of A260

Facile preparation of Au- and BODIPY-grafted lipid nanoparticles for synergized photothermal therapy

• Yuran Wang,
• Xudong Li,
• Haijun Chen and
• Yu Gao

Beilstein J. Nanotechnol. 2022, 13, 1432–1444, doi:10.3762/bjnano.13.118

• –visible (UV–vis) absorption spectra were measured with an UV–vis spectrometer (Q-5000, Quawell, America). The amounts of BDP in AB-LNPs were analyzed using UV–vis spectroscopy after the dissolution of AB-LNPs in DMSO by measuring the absorbance at a wavelength of 600 nm. The loading efficiency (LE, %) was

Orally administered docetaxel-loaded chitosan-decorated cationic PLGA nanoparticles for intestinal tumors: formulation, comprehensive in vitro characterization, and release kinetics

• Sedat Ünal,
• Osman Doğan and
• Yeşim Aktaş

Beilstein J. Nanotechnol. 2022, 13, 1393–1407, doi:10.3762/bjnano.13.115

• the absorbance of the CS-coated formulations was found to significantly increase compared to other formulations, which proves strong interaction between cationic CS and negatively charged mucin. This difference was statistically significant in CS-coated formulations (p < 0.05). Penetration of DCX-PLGA

• (LOQ) were determined for validation of the spectrophotometric method used for DCX quantification. Absorbance values for the amount of DCX were converted to concentration according to the standard calibration curve (r2 = 0.994). LOD and LOQ values were calculated as 0.0173 mg/mL and 0.0634 mg/mL

• nanoparticles, the interaction of mucin and DCX-loaded nanoparticle formulations was evaluated spectrophotometrically by turbidity measurements at 650 nm [10][14][79]. The basis of the experiment is to compare the absorbance of the mucin solution at 650 nm as a reference and the absorbance of the mixture of

LED-light-activated photocatalytic performance of metal-free carbon-modified hexagonal boron nitride towards degradation of methylene blue and phenol

• Nirmalendu S. Mishra and
• Pichiah Saravanan

Beilstein J. Nanotechnol. 2022, 13, 1380–1392, doi:10.3762/bjnano.13.114

• gas chromatograph coupled with a mass spectrometer (GC–MS, Thermo Fisher Scientific) by taking aliquots at 150 min and 330 min. The photocatalytic degradation and mineralization efficiencies were calculated by utilizing the following equations [19]: where Abs(0) symbolizes the initial absorbance, Abs

• (t) represents the absorbance of the samples at varied time intervals, TOC(0) represents the initial TOC, and TOC(t) denotes TOC at varied time intervals. Apparent quantum efficiency The photon harvesting ability of the as-synthesized MBN was evaluated by the apparent quantum efficiency (AQE

• with a zeta potential of −20 mV at a neutral pH. This implies that the surface of MBN-80 is negatively charged above pH 5.08 which results in better adsorptive ability towards positively charged pollutant moieties and vice-versa. Optical studies The UV–vis light harvesting characteristics (absorbance

Supramolecular assembly of pentamidine and polymeric cyclodextrin bimetallic core–shell nanoarchitectures

• Alexandru-Milentie Hada,
• Nina Burduja,
• Marco Abbate,
• Claudio Stagno,
• Guy Caljon,
• Louis Maes,
• Nicola Micale,
• Massimiliano Cordaro,
• Angela Scala,
• Antonino Mazzaglia and
• Anna Piperno

Beilstein J. Nanotechnol. 2022, 13, 1361–1369, doi:10.3762/bjnano.13.112

• nanoGSP; iii) a hyperchromic effect of the Pent band in nanoGSP, although it appears partially overlapped with the ascorbate band at 243 nm. The changes in the UV–vis spectra suggested the interactions of Pent with nanoGS components, and the increase of Pent absorbance in water clearly indicated the

Near-infrared photoactive Ag-Zn-Ga-S-Se quantum dots for high-performance quantum dot-sensitized solar cells

• Roopakala Kottayi,
• Ilangovan Veerappan and
• Ramadasse Sittaramane

Beilstein J. Nanotechnol. 2022, 13, 1337–1344, doi:10.3762/bjnano.13.110

• ]. The elemental Se spectrum (Figure 3f) shows the peaks of Se 3d5/2 (55.65 eV) indicating the existence of Se2− ions [27][29] .This result confirms that the synthesized QDs contain Zn2+, Ag+, Ga3+, S2− and Se2− ions forming I-II-III-VI3-type AgZnGaS1.5Se1.5 QDs. Optical studies The UV–vis absorbance

• –vis–NIR absorption spectrum; (b) Tauc Plot; (c) PL emission; (d) PL decay spectrum of AZGSSe QDs. (a) HRTEM image and (b) EDX spectrum of AZGSSe QDs/TiO2 NFs. (a) UV–vis absorbance spectra; (b) PL decay spectra; (c) PL emission spectra of the AZGSSe/TiO2 NF-based photoanode. Nyquist plot of the

Rapid fabrication of MgO@g-C₃N₄ heterojunctions for photocatalytic nitric oxide removal

• Minh-Thuan Pham,
• Duyen P. H. Tran,
• Xuan-Thanh Bui and
• Sheng-Jie You

Beilstein J. Nanotechnol. 2022, 13, 1141–1154, doi:10.3762/bjnano.13.96

• range (200–400 nm), with a sudden decrease in the visible range. The absorbance of 3% MgO@g-C3N4 is more substantial than the absorbance of 1% MgO@g-C3N4 and 5% MgO@g-C3N4 in the UV and visible ranges. These results indicate that the higher photocatalytic NO removal efficiency of the 3% MgO@g-C3N4

• ) Elemental composition and (b–e) EDS mappings of 3% MgO@g-C3N4. TEM and HR−TEM images of (a, b) MgO@g-C3N4 and (c, d) g-C3N4. The XPS survey (a), HR−XPS C1s (b), N 1s (c), O 1s (d), C 1s (c), and Mg 2s (e, f) of the materials. (a) DRS reflectance spectra, (b) direct bandgap, (c) DRS absorbance spectra, and

Recent advances in green carbon dots (2015–2022): synthesis, metal ion sensing, and biological applications

• Aisha Kanwal,
• Naheed Bibi,
• Sajjad Hyder,
• Arif Muhammad,
• Hao Ren,
• Jiangtao Liu and
• Zhongli Lei

Beilstein J. Nanotechnol. 2022, 13, 1068–1107, doi:10.3762/bjnano.13.93

Spindle-like MIL101(Fe) decorated with Bi₂O₃ nanoparticles for enhanced degradation of chlortetracycline under visible-light irradiation

• Chen-chen Hao,
• Fang-yan Chen,
• Kun Bian,
• Yu-bin Tang and
• Wei-long Shi

Beilstein J. Nanotechnol. 2022, 13, 1038–1050, doi:10.3762/bjnano.13.91

• holes. The bandgap (Eg) of a semiconductor is usually estimated by the Tauc formula (αhν) = A(hv − Eg)n/2, where α is the absorbance, hν is the photon energy, A is a constant, Eg is the bandgap , and n is a constant. For Bi2O3 and MIL101(Fe), as direct bandgap semiconductors, the value of n is 1 [58

DNA aptamer selection and construction of an aptasensor based on graphene FETs for Zika virus NS1 protein detection

• Nathalie B. F. Almeida,
• Thiago A. S. L. Sousa,
• Viviane C. F. Santos,
• Camila M. S. Lacerda,
• Thais G. Silva,
• Rafaella F. Q. Grenfell,
• Flavio Plentz and
• Antero S. R. Andrade

Beilstein J. Nanotechnol. 2022, 13, 873–881, doi:10.3762/bjnano.13.78

• rinsed with 0.1 M HCl for 5 min, water (DNAse/RNAse free) for 1 min, then borate buffer for 5 min under 50 psi pressure before injection of the incubation mixture at 0.5 psi for 5 s. The mixture was separated under 26 kV (reverse polarity) in borate buffer at 25 °C and monitored through UV absorbance

• /ampicillin and incubated overnight at 37 °C, 200 rpm. The plasmids were extracted following the manufacturer protocol of the Wizard® Plus SV Minipreps DNA purification system kit (Promega) and quantified via 260 nm absorbance in a spectrophotometer. The vectors were sequenced by the automated Sanger

• manufacturer’s instructions. The plate was washed three times in borate buffer, and a colorimetric reaction was initiated by adding 3,30,5,50-tetramethylbenzidine (TMB). After incubating the reaction for 15 min, the reaction was stopped by adding 2 M sulfuric acid. Absorbance at 450 nm was recorded and a

Efficient liquid exfoliation of KP₁₅ nanowires aided by Hansen's empirical theory

• Zhaoxuan Huang,
• Zhikang Jiang,
• Nan Tian,
• Disheng Yao,
• Fei Long,
• Yanhan Yang and
• Danmin Liu

Beilstein J. Nanotechnol. 2022, 13, 788–795, doi:10.3762/bjnano.13.69

• KP15 dispersions. The Lambert–Beer law (Equation 3) was then used to measure the concentration of the KP15 dispersions: where A is the absorbance, K is the absorption coefficient of the material, b is the absorbing layer thickness (which in this work is the width of the cuvette, i.e., 1 cm), and C is

• the concentration of the KP15 dispersions. The absorbance A and the absorption coefficient K are related to the wavelength of the incident light. To determine A and K, it is necessary to choose a specific incident wavelength. The bandgap of bulk KP15 is approx. 1.75 eV [20]. However, according to our

• previous study, with thickness reduction of the KP15 nanowires, a surface-state luminescence at 693 nm gradually dominates in the KP15 nanowire [14]. This could affect light absorption properties of KP15 due to its decreased size. To avoid the generation of concentration error caused by the absorbance

Gelatin nanoparticles with tunable mechanical properties: effect of crosslinking time and loading

• Agnes-Valencia Weiss,
• Daniel Schorr,
• Julia K. Metz,
• Metin Yildirim,
• Saeed Ahmad Khan and
• Marc Schneider

Beilstein J. Nanotechnol. 2022, 13, 778–787, doi:10.3762/bjnano.13.68

• organic phase remained uncolored. Samples were then diluted tenfold, and the absorbance was measured at λ = 349 nm in an Infinite M200 plate reader (Tecan group, Männerdorf, Switzerland). The same procedure was followed with the same amount of pure uncrosslinked gelatin, which served as a reference

• ) was added in a concentration of 0.5 mg/mL and the cells were incubated for 4 h on a shaker with 35 rpm at 37 °C protected from light. Subsequently, the absorbance was measured at 550 nm with a plate reader (Synergy 2, BioTek Instruments GmbH, Bad Friedrichshall, Germany). The resulting cell viability

• after substance exposure was calculated based on the absorbance measurements obtained from MTT assay by a percentual ratio to the positive control of 1% Triton X-100 (PanReac AppliChem ITW Reagents, Darmstadt, Germany) and the negative control treated with HBSS according to Equation 1. Statistical

Hierarchical Bi₂WO₆/TiO₂-nanotube composites derived from natural cellulose for visible-light photocatalytic treatment of pollutants

• Zehao Lin,
• Zhan Yang and
• Jianguo Huang

Beilstein J. Nanotechnol. 2022, 13, 745–762, doi:10.3762/bjnano.13.66

• pollutant solution was taken out at set intervals to determine the concentration variation of the pollutant solution. Cr(VI) and RhB were chosen as pollutant representatives, and the concentration of the RhB aqueous solution was measured by the absorbance at λ = 553 nm, analyzed through a Shimadzu UV-2450

• water (40.0 mL) to form solution B. The Cr(VI) pollutant solution (1.0 mL), solution A (40.0 μL), and solution B (20.0 μL) were uniformly blended for 6 min, and the absorbance at λ = 540 nm of the mixed solution was recorded by a Shimadzu UV-2450 spectrophotometer to give the concentration of the

A nonenzymatic reduced graphene oxide-based nanosensor for parathion

• Sarani Sen,
• Anurag Roy,
• Ambarish Sanyal and
• Parukuttyamma Sujatha Devi

Beilstein J. Nanotechnol. 2022, 13, 730–744, doi:10.3762/bjnano.13.65

• the results of the proposed nanosensor. A stock solution (1 mM) of PT was prepared in 99.9% ethanol (Empura, Merck). A 5 mL volume of working solutions of 1 to 35 µM was prepared in ethanol for monitoring the UV spectra in the range of 200–400 nm with a scan rate of 2 nm/s. The absorbance change of PT

• modified electrodes was carried out in 5 mM of [Fe(CN)6]3− and [Fe(CN)6]4− with 0.1 M KCl within the frequency range from 1 MHz to 0.01 Hz, amplitude of 10 mV, at a fixed potential of 0.28 V. The UV–visible absorbance spectra were obtained on a UV–vis–NIR spectrophotometer (SHIMADZU UV-3600). The Raman

Detection and imaging of Hg(II) in vivo using glutathione-functionalized gold nanoparticles

• Gufeng Li,
• Shaoqing Li,
• Rui Wang,
• Min Yang,
• Lizhu Zhang,
• Yanli Zhang,
• Wenrong Yang and
• Hongbin Wang

Beilstein J. Nanotechnol. 2022, 13, 549–559, doi:10.3762/bjnano.13.46

• completed with 10% fetal bovine serum (FBS) and 10 μL cell counting kit-8 reagent (CCK-8) and incubated for 2 h. Then, the samples were washed with HEPES buffer. A microplate reader was used to measure the absorbance at 450 nm. Each group had six parallel wells, and the experiment was repeated three times

Stimuli-responsive polypeptide nanogels for trypsin inhibition

• Petr Šálek,
• Jana Dvořáková,
• Sviatoslav Hladysh,
• Diana Oleshchuk,
• Ewa Pavlova,
• Jan Kučka and
• Vladimír Proks

Beilstein J. Nanotechnol. 2022, 13, 538–548, doi:10.3762/bjnano.13.45

• spectrophotometric measurements. Immediately after mixing, the absorbance at λ = 253 nm was recorded for 5 or 15 min using 1 min time intervals at 25 °C. A blank solution was prepared by mixing Nα-benzoyl-ʟ-arginine ethyl ester substrate solution (2 mL, 0.375 mM) in PBS buffer (pH 7.6) with 1 mM HCl (0.125 mL), and

• , 0.375 mM) in PBS buffer (pH 7.6) with 1 mM HCl (0.125 mL) and trypsin solution (0.075 mL) in 1 mM HCl in cuvettes for UV–vis spectrophotometric measurements. Immediately after mixing, the absorbance at λ = 253 nm was recorded for 5 or 15 min using 1 min time intervals. The blank solutions were prepared

Zinc oxide nanostructures for fluorescence and Raman signal enhancement: a review

• Ioana Marica,
• Fran Nekvapil,
• Maria Ștefan,
• Cosmin Farcău and
• Alexandra Falamaș

Beilstein J. Nanotechnol. 2022, 13, 472–490, doi:10.3762/bjnano.13.40

• , while the visible-range emission is induced by recombination between holes and the electrons in a deep defect level. This defect emission energy matches with the surface plasmon absorbance energy of Au NPs; therefore, it can absorb the visible-emission energy of ZnO NRs. The exact mechanism is described

Coordination-assembled myricetin nanoarchitectonics for sustainably scavenging free radicals

• Xiaoyan Ma,
• Haoning Gong,
• Kenji Ogino,
• Xuehai Yan and
• Ruirui Xing

Beilstein J. Nanotechnol. 2022, 13, 284–291, doi:10.3762/bjnano.13.23

• gradually disappeared (Supporting Information File 1, Figure S2c). Figure S2d (Supporting Information File 1) shows that the scavenging rate of GSH at 8 µg·mL−1 was up to 93.3%. Figure 3a shows that the UV–vis absorbance of diluted ABTS+ solution incubated with different concentrations of MZG nanoparticles

• different concentrations of H2O2 (0.01, 0.1, 1, 10, and 100 mM), UV–vis absorption spectra and the size of the MZG nanoparticles were measured. The UV–vis absorbance of MZG nanoparticles from 300 to 400 nm (Figure 3e) decreased with the increase of H2O2 concentration. Also, the size of MZG nanoparticles was

• tested by DLS. The result showed that the size also decreased dramatically with the increase of H2O2 concentration. The UV–vis absorbance and size of MZG nanoparticles obviously changed at 1 mM of H2O2, indicating that there was a ROS-responsive disassembly of MZG nanoparticles (Figure 3f). Cell

Photothermal ablation of murine melanomas by Fe₃O₄ nanoparticle clusters

• Xue Wang,
• Lili Xuan and
• Ying Pan

Beilstein J. Nanotechnol. 2022, 13, 255–264, doi:10.3762/bjnano.13.20

• show that clustered magnetic Fe3O4 nanoparticles induce a redshift in the light absorption spectra, which enhances light absorbance within the NIR region and improves their utilization as photosensitizers during PTT to ablate lung tumors [16]. However, the role of Fe3O4 nanoparticle clusters in the

• irradiation (power density of 1 W·cm−2 for 10 min). After another 24 h, cells were examined by light microscopy and MTT assays were performed as per the manufacturer’s instructions. The Optical absorbance was measured at 490 nm using a microplate reader. Cell viability was calculated as percentage of the OD

Effects of drug concentration and PLGA addition on the properties of electrospun ampicillin trihydrate-loaded PLA nanofibers

• Tuğba Eren Böncü and
• Nurten Ozdemir

Beilstein J. Nanotechnol. 2022, 13, 245–254, doi:10.3762/bjnano.13.19

• concentrations by making dilutions from a 200 µg/mL ampicillin trihydrate stock. Absorbance values were measured at a wavelength of 213 nm (y = 0.0309x + 0.0466, r2 = 0.9984). Morphology of electrospun nanofibers Nanofibers were firstly gold-coated and the morphology of the electrospun nanofibers was observed on

Theranostic potential of self-luminescent branched polyethyleneimine-coated superparamagnetic iron oxide nanoparticles

• Rouhollah Khodadust,
• Ozlem Unal and
• Havva Yagci Acar

Beilstein J. Nanotechnol. 2022, 13, 82–95, doi:10.3762/bjnano.13.6

• to SPION which has strong absorbance in the visible window of the electromagnetic spectrum. A tremendous enhancement in the poor, mostly unrecognized and unutilized blue luminescence of bPEI was achieved when it was used as a coating on SPION crystals. We suggested that the partial oxidation of the

• Erb. The amount of Erb conjugated to nanoparticles was quantified by the Bradford assay. The unbound Erb removed by dialysis was then concentrated. This solution (1 mL) was mixed with 1 mL of the Bradford Reagent (Sigma-Aldrich, USA) for 10 min at room temperature, and then its absorbance at 595 nm

• was recorded using a UV–vis spectrophotometer (Shimadzu UV-3600 UV–vis–NIR spectrophotometer). A calibration curve was prepared with bovine serum albumin (BSA) at concentration values of 0, 1, 2, 4, 6, 8, and 10 µg/mL in PBS to enable a correlation between the measured absorbance and protein

Sputtering onto liquids: a critical review

• Anastasiya Sergievskaya,
• Adrien Chauvin and
• Stephanos Konstantinidis

Beilstein J. Nanotechnol. 2022, 13, 10–53, doi:10.3762/bjnano.13.2

• discharge current from 10 to 40 mA during the sputtering of Ag onto 1-butyl-1-methylimidazolium hexafluorophosphate (BMIM-PF6) leads not only to a higher total Ag concentration in the solution and a subsequent increase of absorbance of the solution at the SPR peak maximum but also to an increase in the size

Biocompatibility and cytotoxicity in vitro of surface-functionalized drug-loaded spinel ferrite nanoparticles

• Sadaf Mushtaq,
• Khuram Shahzad,
• Tariq Saeed,
• Anwar Ul-Hamid,
• Bilal Haider Abbasi,
• Nafees Ahmad,
• Waqas Khalid,
• Muhammad Atif,
• Zulqurnain Ali and
• Rashda Abbasi

Beilstein J. Nanotechnol. 2021, 12, 1339–1364, doi:10.3762/bjnano.12.99

Enhancement of the piezoelectric coefficient in PVDF-TrFe/CoFe₂O₄ nanocomposites through DC magnetic poling

• Marco Fortunato,
• Alessio Tamburrano,
• Maria Paola Bracciale,
• Maria Laura Santarelli and
• Maria Sabrina Sarto

Beilstein J. Nanotechnol. 2021, 12, 1262–1270, doi:10.3762/bjnano.12.93

• using following equation [28]: where Aα and Aβ are the absorbance at 763 and 840 cm−1, respectively, for the α and β phases, and Kα and Kβ are the absorption coefficients at the corresponding wavenumbers (7.7 × 104 and 6.1 × 104 cm2·mol−1, respectively). As it can be seen from Figure 1, the spectra of