Some physicochemical data on monohydrate citric acid solutions in water: solubility, density, viscosity, diffusivity, pH of standard solution, and refractive index

1976 ◽  
Vol 21 (1) ◽  
pp. 85-87 ◽  
Author(s):  
Claude Laguerie ◽  
Michel Aubry ◽  
Jean P. Couderc
Keyword(s):  
Refractive Index ◽  
Citric Acid ◽  
Water Solubility ◽  
Acid Solutions ◽  
Standard Solution ◽  
Physicochemical Data

Studying the Efficiency of Inhibitors in Chemical Cleaning of Heat-and-Power Equipment by Citric Acid Solutions

2020 ◽  
Vol 67 (1) ◽  
pp. 68-71
Author(s):  
R. T. Burganov ◽  
A. R. Gilmullina ◽  
M. A. Kirilova ◽  
E. A. Kovrizhnykh
Keyword(s):  
Citric Acid ◽  
Power Equipment ◽  
Acid Solutions ◽  
Chemical Cleaning

Rigorous analysis of the interaction between proteins and low water-solubility drugs by qNMR-aided NMR titration experiments

2021 ◽  
Author(s):  
Takuya Hirakawa ◽  
Erik Walinda ◽  
Daichi Morimoto ◽  
Kenji Sugase
Keyword(s):  
Quantitative Analysis ◽  
Water Solubility ◽  
Accurate Estimation ◽  
Rigorous Analysis ◽  
Nmr Titration ◽  
Target Proteins ◽  
Physicochemical Data

Drugs are designed and validated based on physicochemical data on their interactions with target proteins. For low water- solubility drugs, however, quantitative analysis is practically impossible without accurate estimation of...

Molecular Interactions Investigation of L-Histidine in Water and in Aqueous Citric Acid at Different Temperatures Using Volumetric and Acoustic Methods

2018 ◽  
Vol 232 (3) ◽  
pp. 393-408 ◽  
Author(s):  
Dinesh Kumar ◽  
Shashi Kant Sharma
Keyword(s):  
Citric Acid ◽  
Molar Volume ◽  
Atmospheric Pressure ◽  
Apparent Molar Volume ◽  
Adiabatic Compressibility ◽  
Acid Solutions ◽  
Solvent Interactions ◽  
Intermolecular Free Length ◽  
Acoustic Methods ◽  
Different Temperatures

AbstractDensities,ρand ultrasonic speeds, u of L-histidine (0.02–0.12 mol·kg−1) in water and 0.1 mol·kg−1aqueous citric acid solutions were measured over the temperature range (298.15–313.15) K with interval of 5 K at atmospheric pressure. From these experimental data apparent molar volume ΦV, limiting apparent molar volume ΦVOand the slopeSV, partial molar expansibilities ΦEO, Hepler’s constant, adiabatic compressibilityβ, transfer volume ΦV, trO, intermolecular free length (Lf), specific acoustic impedance (Z) and molar compressibility (W) were calculated. The results are interpreted in terms of solute–solute and solute–solvent interactions in these systems. It has also been observed that L-histidine act as structure maker in water and aqueous citric acid.

scholarly journals Peningkatan Mutu Minyak Nilam (Pogostemon cablin) dalam Proses Pemurnian Minyak Nilam Aceh Jaya dan Aceh Selatan dengan Metode Kompleksometri

2019 ◽  
Vol 4 (4) ◽  
pp. 310-318
Author(s):  
Rahmat Akbar Manalu ◽  
Anshar Patria ◽  
Syarifah Rohaya
Keyword(s):  
Refractive Index ◽  
Citric Acid ◽  
Block Design ◽  
Chemical Purification ◽  
Purification Method ◽  
Fe Content ◽  
Pogostemon Cablin ◽  
Two Factors ◽  
D Region ◽  
Chelating Compounds

Abstrak : Pemurnian merupaakan proses penghilangan bahan-bahan yang tidak diinginkan dari minyak nilam hasil penyulingan. Metode pemurnian terbagi atas dua cara yaitu pemurnian secara kimia dan pemurnian secara fisik. Pengkelatan atau kompleksometri adaalah pengikatan logaam dengan cara menambbahkan senyawa pengkelat dan memmbentuk komplek logam senyawa pengkeelat. Proses pengkelat metode sama dengan adsorben, akan tetapi senyawa adsorben diganti dengan senyawa pengkelat. Senyawa pengkelat yang cukup dikenal dalam proses pemurnian minyak atsiri antara lain EDTA, asam sitratt, asam mallat, dan asam tartarrat. Peneliitian ini menggunakaan rancangan acaak kelomppok (RAK) faktorial yang terrdiri dari 2 fakktor. Faktor pertama yaitu asal daerah minyak nilam yang terdiri dari 2 taraf (D1=Aceh Selatan dan D2=Aceh Jaya). Faktor kedua yaitu konsentrasi senyawa EDTA yang terdiri dari 3 taraf (H1=1,5%, H2=2% dan H3=2,5%). Faktor asal daerah minyak nilam (D) berpengaruh ssangat nyataa terhadap nilai bobot jenis dan indeks bias juga berpengaruh nyata terhadap bilangan asam. Senyawa EDTA dapat menurunkan kadar Fe pada minyak nilam sebesar 34,8-38,0 %.Abstract : Purification is the process of removing undesirable materials from distilled patchouli oil. The purification method is divided into two ways, that is chemical purification and physical purification. Corrosion or complexometric is binding of metal by adding chelating compounds and making a metal complex of chelating compound. Chelating process is same as the adsorbent, but the adsorbent compound is replaced with chelating composition. Chelating compounds that are well known in the process of refining essential oils include EDTA, citric acid, malic acid, and tartaric acid. This sstudy used a Randoized Block Design (RDB) factorial consisting two factors. The first factor is the origin of patchouli oil which consists of 2 levels (D1 = South Aceh and D2 = Aceh Jaya). The second factor is the composition of EDTA which consists of 3 levels (H1 = 1.5%, H2 = 2% and H3 = 2.5%). Factors from patchouli oil (D) region have a very significant effect on the value of density and the refractive index also has a significant effect on acid numbers. EDTA compounds can reduce Fe content in patchouli oil by 34.8-38.0%.

scholarly journals Assessment of Physicochemical Properties of Tequila Brands: Authentication and Quality

2016 ◽  
Vol 2016 ◽  
pp. 1-13 ◽  
Author(s):  
Alejandra Carreon-Alvarez ◽  
Amaury Suárez-Gómez ◽  
Florentina Zurita ◽  
Sergio Gómez-Salazar ◽  
J. Felix Armando Soltero ◽  
...  
Keyword(s):  
Principal Component Analysis ◽  
Cluster Analysis ◽  
Refractive Index ◽  
Physicochemical Properties ◽  
Analysis Of Variance ◽  
Principal Component ◽  
Component Analysis ◽  
Total Variability ◽  
And Cluster Analysis ◽  
Physicochemical Data

Several physicochemical properties were measured in commercial tequila brands: conductivity, density, pH, sound velocity, viscosity, and refractive index. Physicochemical data were analyzed by Principal Component Analysis (PCA), cluster analysis, and the one-way analysis of variance to identify the quality and authenticity of tequila brands. According to the Principal Component Analysis, the existence of 3 main components was identified, explaining the 87.76% of the total variability of physicochemical measurements. In general, all tequila brands appeared together in the plane of the first two principal components. In the cluster analysis, four groups showing similar characteristics were identified. In particular, one of the clusters contains some tequila brands that are not identified by the Regulatory Council of Tequila and do not meet the quality requirements established in the Mexican Official Standard 006. These tequila brands are characterized by having higher conductivity and density and lower viscosity and refractive index, determined by one-way analysis of variance. Therefore, these economical measurements, PCA, and cluster analysis can be used to determinate the authenticity of a tequila brand.

scholarly journals The effect of cocrystallization method and citric acid as coformer on water solubility of ethyl p-metoxycinnamate particle

2020 ◽  
Author(s):  
Revika Rachmaniar ◽  
Hesti Riasari ◽  
Lisarah Fauziah ◽  
Kenti ◽  
Rival Ferdiansyah
Keyword(s):  
Citric Acid ◽  
Water Solubility

Correction-Refractive Index of Phosphoric Acid Solutions at 25 degrees C

1965 ◽  
Vol 10 (2) ◽  
pp. 204-204
Author(s):  
O Edwards ◽  
R Dunn ◽  
J Hatfield
Keyword(s):  
Refractive Index ◽  
Phosphoric Acid ◽  
Acid Solutions
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