Topic
Buffer solution
About: Buffer solution is a research topic. Over the lifetime, 6948 publications have been published within this topic receiving 112440 citations. The topic is also known as: pH buffer & buffer.
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TL;DR: The overloaded band profiles and the adsorption isotherms of propranolol were acquired at 23 degrees C, on the endcapped C18-Kromasil stationary phase, using two aqueous solutions of methanol as the mobile phase to show that the adsorbate-adsorbate interactions take place in the absence of buffer but vanish when theMobile phase is buffered.
53 citations
TL;DR: In this paper, a carbon paste CP electrode modified with gold nanoparticles was used for the determination of DA spiked into human serum samples, and excellent recovery results were obtained over a wide concentration range of DA.
Abstract: �1 universal buffer solution pH 7.4 is introduced. The sensor is based on a carbon paste CP electrode modified with gold nanoparticles. In a mixture of DA, AA, and UA, the sensor shows high selective response toward DA and no response for AA or UA. The effect of various experimental parameters including time of deposition of gold nanoparticles on the CP electrode, pH, and scan rate on the voltammetric response of DA was investigated. At the optimum conditions, the concentration of DA was determined using differential pulse voltammetry in a linear range of 1.0 10 �7 to 5.0 10 �6 mol L �1 and 5.0 10 �6 to 1.3 10 �4 mol L �1 with correlation coefficients of 0.9995 and 0.9988 and a detection limit of 5.9 10 �9 and 8.2 10 �8 mol L �1 , respectively. The modified electrode can be used for the determination of DA spiked into human serum samples, and excellent recovery results were obtained over a wide concentration range of DA. Moreover, validation parameters, such as reproducibility, sensitivity, and recovery were evaluated successfully in the determination of DA in diluted human urine.
53 citations
TL;DR: In this paper, a textile-based, highly sensitive pH sensor for pH determination is presented, which is based on impedance measurements of three conductive fabrics (Argenmesh, Ristop silver and stainless steel mesh).
Abstract: Determining the pH of sweat provides valuable information for athletes and patient monitoring. This work presents a textile-based, highly sensitive pH sensor for pH determination. Three conductive fabrics (Argenmesh, Ristop silver and stainless steel mesh (SSM)) were modified with a pH sensitive electrodeposited iridium oxide film (EIROF). The three electrodeposited fabrics were characterized by impedance measurements. The stainless steel mesh showed the best sensitivity to pH changes and therefore was selected for further experiments. Two configurations of this fabric were evaluated, looking for improvement in pH sensitivity and temperature dependence. The best result was obtained with the configuration that maximizes the contact surface between the stainless steel fibers, showing an error of 0.15% in the pH measurement of a buffer solution. This configuration was also used to perform in vivo measurements, obtaining an error of 4% when compared to the measurements performed with a commercial pH test strip. The implementation of sensor into textiles brings some advantages such as comfort, biocompatibility and washability, among others; making the future incorporation of a sensor into a garment very possible.
53 citations
TL;DR: In this article, the mesoporous titanium oxide (mesoTiO 2 ) materials were used for the immobilization of hemoglobin (Hb) and its bioelectrochemical properties were studied.
53 citations
TL;DR: In this article, the toxicity of the various metals tested toward immobilized phosphatase is ranged as follows: Cd2++>Co2+>Zn2+−>Ni2+•Pb2+
Abstract: Alkaline phosphatase conductometric biosensors consisting of interdigitated gold electrodes and enzyme membranes have been used for assessment of heavy-metal ions in water. These analytes act as enzyme inhibitors. Enzyme residual activity has been measured in Tris-nitrate buffer without metal preincubation in the presence of Mg2+ ions as activator. The results indicate that the toxicity of the various metals tested toward immobilized phosphatase is ranged as follows: Cd2+ > Co2+ > Zn2+ > Ni2+ > Pb2+. Detection limits were about 0.5 ppm for Cd2+, 2 ppm for both Zn2+ and Co2+, 5 ppm for Ni2+ and 40 ppm for lead ions. In addition, the responses during 10 h were stable (RSD 4%) and a drift of about 7% per day was observed. The storage stability in buffer solution at 4 °C remained stable for more than one month.
53 citations