M. parviflora leaves mucilage (MLM) powder was dispersed in distilled water to prepare 2.5% (w/v). Then it was placed for 12 h at 4 °C for complete hydration. The rheological property of this dispersion was observed using a rheometer (AR 1500ex, TA instruments, New Castle, DE, USA). The rheograms of this dispersion were taken at room temperature (25 °C) using a rheometer (AR 1500ex, TA instruments, New Castle, DE, USA) with cone and plate geometry. The shear rate was uniformly increased from 0–1000 s−1 over 1 min and then decreased to zero over 1 min at room temperature [29 (link)].
Ar 1500ex
Manufactured by TA Instruments
Sourced in United States
The AR 1500ex is a rotational rheometer designed for rheological analysis. It features a high-performance motor and advanced control systems to precisely measure the flow and deformation properties of a wide range of materials, including polymers, dispersions, and complex fluids.
Automatically generated - may contain errors
Lab products found in correlation
Mos 450, by Bio-Logic (2 mentions)
Arx 400, by Bruker (2 mentions)
Lsm 780, by Zeiss (2 mentions)
Ir prestige 21 ft ir spectrophotometer, by Shimadzu (1 mentions)
Zetapals, by Brookhaven Instruments (1 mentions)
Bi 200sm, by Malvern Panalytical (1 mentions)
Uv 2550, by Shimadzu (1 mentions)
Tensor 2 ftir spectrometer, by Bruker (1 mentions)
Uv 1700 spectrometer, by Shimadzu (1 mentions)
Lcms 20ad, by Shimadzu (1 mentions)
Ls55 spectrofluorometer, by PerkinElmer (1 mentions)
Jem 2010f, by JEOL (1 mentions)
Ht7700 exalens system, by Hitachi (1 mentions)
Synergy 4, by Agilent Technologies (1 mentions)
Spectrum quant software, by PerkinElmer (1 mentions)
43 protocols using ar 1500ex
1
Rheological Characterization of Mucilage Dispersion
2
Rheological Behavior of Yogurt-Plantain Fiber Blends
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For viscosity measurements, an in-house made yogurt was mixed with plantain flours to yield total fiber concentrations ranging from 0.1 to 1.5% (w/v). Steady shear rate sweep was carried out at 25°C in a stress-controlled rheometer AR1500ex (TA Instruments, New Castle, USA), using the standard concentric cylinders fixture (HA AL CONICAL DIN, inside radius = 13.98 mm, outside radius = 15.19 mm, length = 42.05 mm, GAP = 5,920 μm). An ascendant sweep from 0.1 to 100 s−1 was chained.
3
Structural and Optical Characterization of SAA1-7 and TDCNfs
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Time-dependent (0, 30, 60, 120 min) samples in the process of SAA1-7 doped with Tel , and the samples of TDCNfs colloidal solution (10 mg/mL) for 1 h, 1 month, and 2 months were prepared and observed using TEM (JEM-2100F, Japan). TDCNfs (diluted in PBS, 10 mg/mL) were prepared in a gradient molar ratio (15%, 30%, 50%) of Tel and the fluorescence emission spectra (BIO-RAD, λexc = 260 nm) were recorded. Different concentrations of TDCNfs and SAA1-7 were prepared to determine CMC using dynamic light scattering (BI-200SM, Brookhaven, USA). Infrared Spectroscopy of TDCNfs, SAA1-7 was performed in IR-Prestige 21 FTIR Spectrophotometer (Shimadzu, Japan). The rheology test of SAA1-7 , TDCNfs , Cy5.5 TDCNfs was done on an AR 1500ex (TA Instrument) system. The details are given in Supporting Information .
4
Rheological Analysis of Gel-HI Hydrogels
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Rheological analysis of the Gel-HI hydrogels was performed using a rheometer (AR1500ex, TA Instruments, New Castle, DE) with an 8-mm parallel plate geometry. For analysis of viscoelastic properties of preformed hydrogels in their equilibrium swelling state, hydrogel discs were prepared and swelled in DPBS. For dynamic time sweep, we monitored the elastic modulus (G′) and viscous modulus (G′′) at 1% strain and a frequency of 0.1 Hz at 37°C with a 1.3-mm gap.
5
Hydrogel Characterization and Stability
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The size distribution, UV‐vis absorption spectra, zeta potential, and CD spectra of hydrogels were measured on a dynamic light scattering spectrometer (BI‐200SM; Malvern), UV‐vis spectrophotometer (UV‐2550; Shimadzu), zeta potential analyzer (ZetaPALS; Brookhaven), and BioLogic (MOS‐450) system, respectively. The rheology test was used to study the formation, stability, and viscoelasticity by a rheometer (AR 1500ex; TA Instruments). Moreover, the micromorphology was characterized by TEM. Then PM‐nano was dispersed and incubated in serum at 37°C for 24 hours. The mixture was imaged by TEM at the predetermined time point to evaluate the structure stability.
6
Hydrogel Rheological and Structural Characterization
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Rheological experiments: The rheological test of the hydrogels was carried out in oscillatory mode using a rheometer (AR 1500ex, TA Instruments, USA). During the experiments, the hydrogels were spread on a parallel plate (25 mm) and sealed with silicone oil to prevent solvent evaporation. A dynamic frequency scan in the range from 0.1 to 100 rad/s was used to record the storage and loss moduli G′ and G′′. The stress amplitude and temperature were set as 0.1% and 25 °C, respectively.
Fourier transform infrared (FTIR) spectroscopy: The FTIR spectra of the hydrogels and individual components were obtained on an attenuated total reflection-FTIR spectroscope (Tensor Ⅱ FTIR spectrometer, Bruker, Germany), and the scanned wavenumber was in the range of 4000 and 500 cm−1.
Scanning electron microscopy (SEM): The hydrogels were coated on copper grids and dried under atmospheric conditions. The samples were sprayed with gold and detected by a scanning electron microscope (Zeiss Merlin Compact microscope, Germany) with an acceleration voltage of 5 kV.
Fourier transform infrared (FTIR) spectroscopy: The FTIR spectra of the hydrogels and individual components were obtained on an attenuated total reflection-FTIR spectroscope (Tensor Ⅱ FTIR spectrometer, Bruker, Germany), and the scanned wavenumber was in the range of 4000 and 500 cm−1.
Scanning electron microscopy (SEM): The hydrogels were coated on copper grids and dried under atmospheric conditions. The samples were sprayed with gold and detected by a scanning electron microscope (Zeiss Merlin Compact microscope, Germany) with an acceleration voltage of 5 kV.
7
Rheological Characterization of Samples
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The rheological properties of each sample were characterized using dynamic oscillatory rheometer (AR1500ex, TA Instrument) with a parallel plate geometry (25 mm in diameter). The test was conducted at 150 °C with the frequency ranging from 0.1 to 100 rad s−1, and the strain amplitude was set at 2% that was within the linear viscoelastic regime.
8
Rheological Profiling of Gel Formulations
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The rheological behavior of various gels was monitored using a dynamic shear rheometer (AR1500ex; TA Instruments, New Castle, DE, USA). The sample was placed on a parallel plate with a temperature controller. A thin layer of silicon oil was added to the outer edge of the sample to prevent evaporation of the solvent. The storage modulus (G′) and the loss modulus (G″) were recorded when the temperature changed. The temperature was increased from 20°C to 50°C at an interval of 1°C. The parameters of rheological assay were set as the controlled strain γ of 0.4%, angular frequency of 1 rad s−1, and equilibration time of 90 seconds.
9
Starch Pasting Behavior Analysis
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The pasting profile was evaluated during the cooking of the flours in a stress rheometer (Ar-1500ex, TA Instruments, Dallas, TX, USA) using a starch pasting cell (SPC) with a vanned rotor at 500 s_1. The temperature profile started with a heating ramp temperature of 5°C/min from 50 to 95°C, holding at 95°C for 10 min, cooling ramp temperature of 5°C/min from 95 to 60°C and finally holding at 60°C for 10 min. The starch concentration in the sample was 8% (dry basis).
10
Viscosity Analysis of ctDNA-YP Complexes
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Apparent viscosity was measured using a controlled-stress rheometer (AR1500ex; TA, New Castle, DE, USA) on the basis of the method of Zhou et al. [39 (link)] with slight modification. Viscosity was measured at 25 °C using a parallel steel plate (diameter = 40 mm) with a 1 mm gap as shear rate increased from 0.1 to 100 s−1. One mL of ctDNA (0.9 mg/mL) was added to 1 mL of different concentrations of YP (0, 1.02, 2.7, 5.4, and 9.9 mg/mL), and then each solution was mixed with 1 mL of water. Flow time was measured using a digital stopwatch, and the average time calculated for 5 replicates was obtained to evaluate the viscosity of ctDNA alone and mixtures of ctDNA with different molar ratios of YP (r = [YP]/[ctDNA]). Viscosity (η) was calculated from the observed flow time of the ctDNA-containing solution (t) and corrected using the flow time of the buffer solution (t0) using equation η = (t − t0)/t0. The obtained data were plotted as (η/η0)1/3 versus r, where η represents the viscosity of ctDNA in the presence of YP, and η0 is the viscosity in the buffer solution without YP.
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