scholarly journals A Quantitative Study of Carmine Aqueous Solution Based on Drop-Coating Deposition Micro-Raman Spectroscopy (DCDR)

2021 ◽  
Vol 2097 (1) ◽  
pp. 012019
Author(s):  
Wei Huang
Keyword(s):  
Aqueous Solution ◽  
Raman Spectrum ◽  
Small Volume ◽  
Tobacco Industry ◽  
Food Additives ◽  
Health And Safety ◽  
Promising Technique ◽  
Analyte Solution ◽  
Good Potential ◽  
Higher Sensitivity

Abstract Carmine is a kind of colorant which is widely used in food, beverage, medicine, cosmetics and tobacco industry. However, excessive use of carmine may lead to the risks of carcinogenic, teratogenic and mutagenic, which seriously threaten the health and safety of consumers. In this paper, DCDR technology is utilized to develop a quantitative method for the detection of carmine, which requires only a small volume deposition of analyte solution (several μL) on a suitable hydrophobic substrate. The conventional Raman spectrum of carmine aqueous solution and corresponding Raman spectrum using DCDR method were compared, illustrating a much higher sensitivity for DCDR method. The Raman spectra of carmine aqueous solution with different concentrations of 100, 50, 10, 8, 4 and 2μg/mL are acquired from the spots on the “coffee-ring” with DCDR method. Using DCDR method, a good linear relationship has been observed between the intensities of the two characteristic peaks, 1364cm−1 as well as 1572cm−1, and the concentrations of the solution, with the linear correlation coefficient of R2>0.99. The results illustrate that DCDR method has a good potential in the quantitative analysis of colorant like carmine, providing a promising technique for a rapid detection for food additives.

On the Raman spectrum of some proteins in aqueous solution

1970 ◽  
Vol 31 (8) ◽  
pp. 425-426 ◽  
Author(s):  
G. Careri ◽  
V. Mazzacurati ◽  
G. Signorelli
Keyword(s):  
Aqueous Solution ◽  
Raman Spectrum

Determination of Reserpine in Tablets by Liquid Chromatography with Fluorescence Detection: Revised Procedure

1994 ◽  
Vol 77 (3) ◽  
pp. 758-760
Author(s):  
Ugo R Cieri
Keyword(s):  
Aqueous Solution ◽  
Liquid Chromatography ◽  
Fluorescence Detection ◽  
Sodium Salt ◽  
Filter Paper ◽  
Mobile Phase ◽  
Small Volume ◽  
Slight Modification ◽  
Reference Solution

Abstract A procedure is presented for the determination of reserpine in tablets by liquid chromatography (LC) that is a slight modification of a method presented in a previous publication. The sample is extracted with methanol, and solutions are filtered through filter paper. For LC, a 7.5 cm column is used; the mobile phase is methanol containing a small volume of an aqueous solution of the sodium salt of 1-pentanesulfonic acid. Detection is by fluorescence with 280 nm excitation and 360 nm emission. Two commercial samples containing 0.1 and 0.25 mg reserpine were analyzed. For each sample, 2 determinations were made on a ground composite. Ten tablets were also analyzed individually. A linearity study was conducted, with solutions ranging in concentration from 80 to 120% of the amount present in the reference solution.

scholarly journals CO2 Capture by Absorption in Activated Aqueous Solutions of N,N-Diethylethanoloamine

2017 ◽  
Vol 24 (2) ◽  
pp. 239-248 ◽  
Author(s):  
Ewelina Kruszczak ◽  
Hanna Kierzkowska-Pawlak
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Co2 Capture ◽  
Tertiary Amine ◽  
Absorption Rate ◽  
Absorption Process ◽  
Promising Technique ◽  
Gas Streams ◽  
Hindered Amines ◽  
Amine Solutions

Abstract The CO2 absorption process using aqueous amine solutions has been the most promising technique used for the removal of CO2 from gas streams in energy sector. In recent years, many researchers tested solutions which are composed of several compounds: a slow reacting tertiary amine- and a fast amine acting as an activator. In this paper, the CO2 absorption rate in an aqueous solution of N,N-diethylethanoloamine (DEEA) and activated solutions DEEA is investigated experimentally. The activators considered are sterically hindered amines: 2-amino-2-methyl-1-propanol (AMP), 2-amino-2-methyl-1,3-propanediol (AMPD) and N-methyl-1,3-propanediamine (MAPA) from the group of polyamines. The experiments were conducted over the temperature range of 303-333 K and the total amine concentration of 2 M. From the CO2 absorption experiments into mixed aqueous solutions of DEEA and MAPA, it was found that the addition of small amounts of MAPA into aqueous DEEA solutions has a significant effect on the enhancement of the CO2 absorption rate. The application of hindered amines: AMP or AMP as activators resulted in a marginally improvement of the absorption rate of CO2.

Raman spectrum (in aqueous solution) and force constants of MoO3S2−

1978 ◽  
Vol 34 (5) ◽  
pp. 561-562 ◽  
Author(s):  
A. Müller ◽  
N. Mohan ◽  
H. Dornfeld ◽  
C. Tellez
Keyword(s):  
Aqueous Solution ◽  
Raman Spectrum ◽  
Force Constants

Adsorptive Removal of Ni2+ from Aqueous Solution Using Rice Husk-Based Activated Carbon

2015 ◽  
Vol 754-755 ◽  
pp. 950-954
Author(s):  
Mohd Faisal Taha ◽  
Anis Suhaila Shuib ◽  
Maizatul Shima Shaharun ◽  
Azry Borhan
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Rice Husk ◽  
Textural Properties ◽  
Freundlich Isotherm ◽  
Isotherm Models ◽  
Adsorption Studies ◽  
Adsorptive Removal ◽  
Equilibrium Data ◽  
Good Potential

An attempt was made to study the potential of rice husk as an alternative cheap precursor for activated carbon to remove Ni2+ from aqueous solution. Rice husk was treated chemically (with NaOH) and physically (carbonization) to prepare rice husk based activated carbon (RHAC). The textural properties of RHAC, i.e. surface area (255 m2/g) and pore volume (0.17 cm2/g), were determined by N2 adsorption using Brunauer-Emmett-Teller (BET) surface analyzer. RHAC was also characterized for its morphology and its elemental compositions. The adsorption studies for the removal of Ni2+ from aqueous solution were carried out using different dosage of RHAC as adsorbent as a function of varied contact time. The concentration of Ni2+ was determined by atomic absorption spectrometer (AAS). The results obtained from adsorption studies indicate good potential of rice husk as a cheap precursor to produce activated carbon for the removal of Ni2+ from aqueous solution. The equilibrium data from adsorption studies fitted well the of Langmuir and Freundlich isotherm models.

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