Optical method for measuring optical rotation angle and refractive index of chiral solution

2007 ◽  
Vol 46 (33) ◽  
pp. 8134 ◽  
Author(s):  
Jiun-You Lin ◽  
Kun-Huang Chen ◽  
Jing-Heng Chen
Keyword(s):  
Refractive Index ◽  
Optical Method ◽  
Rotation Angle ◽  
Optical Rotation

Atomic Contributions to the Optical Rotation Angle as a Quantitative Probe of Molecular Chirality

Science ◽  
1998 ◽  
Vol 282 (5397) ◽  
pp. 2247-2250 ◽  
Author(s):  
R. K. Kondru ◽  
P. Wipf ◽  
D. N. Beratan
Keyword(s):  
Rotation Angle ◽  
Optical Rotation ◽  
Molecular Chirality

Amplitude Sensitive Optical Heterodyne and Phase Lock-in Technique on Small Optical Rotation Angle Detection of Chiral Liquid

1997 ◽  
Vol 36 (Part 1, No. 1A) ◽  
pp. 356-359 ◽  
Author(s):  
Chien Chou ◽  
Yeu-Chuen Huang ◽  
Ching-Mei Feng ◽  
Ming Chang
Keyword(s):  
Rotation Angle ◽  
Optical Rotation ◽  
Optical Heterodyne ◽  
Phase Lock ◽  
Lock In

scholarly journals NILAI TAMBAH MINYAK AKAR WANGI DENGAN PEMEKATAN KADAR VETIVEROL MENGGUNAKAN EKSTRAKSI CO2 FLUIDA SUPERKRITIK

2014 ◽  
Vol 16 (2) ◽  
pp. 76-81 ◽  
Author(s):  
Anny Sulaswatty ◽  
Egi Agustian
Keyword(s):  
Carbon Dioxide ◽  
Refractive Index ◽  
Specific Gravity ◽  
Supercritical Fluid Extraction ◽  
Supercritical Fluid ◽  
Flow Rate ◽  
Optical Rotation ◽  
Process Conditions ◽  
Fluid Extraction ◽  
Great Opportunity

Potensi Indonesia akan minyak akar wangi yang berorientasi ekspor dalam industri kosmetik, parfum, sabun, keperluan terapi, antiseptik, massage oil, farmasi dan pestisida memberikan peluang yang besar untuk memenuhi kebutuhan dunia. Guna nilai tambah minyak akar wangi dengan meningkatkan kadar vetiverol sebagai komponen utama, diaplikasikan teknologi ekstraksi fluida karbondioksida superkritik yang merupakan perpaduan ekstraksi, fraksinasi dan deodorisasi dengan didukung keunggulan karbondioksida sebagai pelarut yang inert, ramah lingkungan, mudah dipisahkan, dan berdaya larut tinggi.  Minyak akar wangi Garut (Java vetiver oil) sebagai bahan baku, mempunyai karakteristik  kadar vetiverol  39.03 %; Bobot jenis 0.9977; indeks bias 1.5247;  putaran optik +38.1; kelarutan dalam alkohol 95%  yaitu 1:1 jernih; bilangan asam 28.1; bilangan ester 24.6; bilangan ester setelah asetilasi 115.5; serta tidak mengandung minyak lemak dan  minyak keruing. Pemilihan kondisi proses guna menghasilkan kandungan vetiverol optimal dilakukan dengan memvariasikan laju alir gas CO2, tekanan dan suhu sebagai parameter penting dalam keberhasilan proses ekstraksi minyak akar wangi dengan fluida CO2 superkritik. Pemilihan laju alir konstan dan lebih stabil  diperoleh pada 5.5 liter/menit, sedangkan untuk variasi tekanan ekstraktor (1500, 1750, 2000 psi) dan suhu ekstraktor (40-50oC);  tekanan dan suhu separator  500 psi dan 25oC serta waktu proses selama lima jam dengan pengambilan ekstrak setiap jam. Tekanan dan suhu proses yang optimal diperoleh pada 1750 psi dan suhu 40oC  dengan  rafinat minyak akar wangi berkadar vetiverol  51.82 %,  bilangan ester 7.2 dan bilangan ester setelah asetilasi  172.4. Tingginya tekanan dan rendahnya suhu berpengaruh terhadap perolehan ekstrak; penurunan rafinat; peningkatan nilai  bobot jenis ekstrak dan rafinat; indeks bias ekstrak dan rafinat; putaran optik ekstrak dan rafinat; peningkatan viskositas ekstrak dan rafinat; peningkatan bilangan ester ekstrak, bilangan ester setelah asetilasi ekstrak, serta kandungan vetiverol.Kata Kunci: Minyak Akar Wangi, Vetiverol, Ekstraksi Fluida Superkritik Potential Indonesian vetiver oil export oriented industry of cosmetics, perfumes, soaps, therapeutic purposes, antiseptic, massage oil, pharmaceutical and pesticide presents a great opportunity to meet the needs of the world. In order to add value vetiver oil by increasing the levels vetiverol as the main component, was applied to carbon dioxide supercritical fluid extraction technology which is a combination of extraction, fractionation and deodorization with excellence supported carbon dioxide as an inert solvent, eco-friendly, easily separated, and the high solubility. Garut vetiver oil (Java vetiver oil) as raw material, has the characteristics vetiverol levels 39.03%, specific gravity of 0.9977; refractive index of 1.5247; optical rotation +38.1; solubility in alcohol 95% is a clear 1:1; acid number 28.1; ester number 24.6; ester number after acetylation 115.5; as well as fats and oils contain no oil keruing. The selection process conditions in order to produce optimal vetiverol content performed by varying the flow rate of CO2 gas, pressure and temperature as an important parameter in the success of vetiver oil extraction with supercritical CO2 fluid. The selection of a constant flow rate and more stable obtained at 5.5 liters / min, whereas for pressure variation extractor (1500-2000 psi) and extractor temperature (40-50oC); separator pressure and temperature of 500 psi and 25 °C as well as the processing time for five hours by taking extracts every hour. Pressure and temperature optimum process obtained at 1750 psi and a temperature of 40oC with rafinat vetiverol vetiver oil yield of 51.82%, ester number 7.2, and ester number after acetylation 172.4. The high pressure and low temperature affect the acquisition of the extract; rafinat decline; increase in the value of specific gravity and rafinat extracts; refractive index and rafinat extract; optical rotation and rafinat extract; increase in the viscosity of the extract and rafinat; increase in numbers ester extract, ester number after acetylation extracts, as well as the content vetiverol. Key word: Vetiver Oil, Vetiverol, Supercritical Fluid Extraction.

Multifunctional weak measurement system that can measure the refractive index and optical rotation of a solution

2019 ◽  
Vol 114 (18) ◽  
pp. 181901 ◽  
Author(s):  
Yang Xu ◽  
Lixuan Shi ◽  
Tian Guan ◽  
Suyi Zhong ◽  
Xuesi Zhou ◽  
...  
Keyword(s):  
Refractive Index ◽  
Measurement System ◽  
Optical Rotation ◽  
Weak Measurement

An instrument for measuring low optical rotation angle

Optik ◽  
2011 ◽  
Vol 122 (8) ◽  
pp. 733-738 ◽  
Author(s):  
Jing-Fung Lin ◽  
Jyh-Shyang Wu ◽  
Cong-Hui Huang ◽  
Jiann-Shing Jeng
Keyword(s):  
Rotation Angle ◽  
Optical Rotation

An optical method for measuring PVT data, critical constants, virial coefficients, and molecular parameters of GeH4

1983 ◽  
Vol 61 (7) ◽  
pp. 1060-1063
Author(s):  
D. Balzarini ◽  
A. Rosenberg ◽  
P. Palffy-Muhoray
Keyword(s):  
Refractive Index ◽  
Equation Of State ◽  
Optical Method ◽  
Virial Coefficients ◽  
Virial Equation ◽  
Density Range ◽  
Lennard Jones ◽  
Pvt Data ◽  
Virial Equation Of State ◽  
Critical Constants

An optical method has been developed for measuring PVT data for a fluid. The method consists of measuring the refractive index as a function of density and temperature and, separately, as a function of pressure and temperature. The results are combined to yield PVT data. Germane has been studied. Isotherms have been measured in the temperature range 293 to 323 K and the density range 0.07 to 0.7 g cm−3. The data in the critical region are analyzed to obtain the critical constants Pc = 48.8 atm, ρc = 0.522 g cm−3, and Tc = 38.97 C ± 0.2. The data at lower densities are fitted to a virial equation of state to obtain the second and third coefficients. The values at 312.15 K are B = −2.37 cm3 g−1 and C = 1.99 cm6 g−2. The data are analyzed to yield the Lennard–Jones parameters ε/K = 230 ± 15 deg and σ = 4.6 ± 0.2 Å.

Critical Review of Methods for Analysis of Oleoresins

1965 ◽  
Vol 48 (3) ◽  
pp. 515-521
Author(s):  
William H Stahl
Keyword(s):  
Gas Chromatography ◽  
Refractive Index ◽  
Critical Review ◽  
Steam Distillation ◽  
Optical Rotation ◽  
Volatile Oil ◽  
The Other ◽  
Specific Component ◽  
Precision And Accuracy ◽  
Instrumental Methods

Abstract Oleoresins represent a type of flavoring material that is being used in ever increasing quantities. On the other hand, it is a poorly defined group of products, and the majority of analytical methods used in characterizing them, such as volatile oil by steam distillation, refractive index, optical rotation, are relatively meaningless; additionally, some of the specific component analyses, such as “heat” and capsicum (organoleptic), piperine (calculated from analysis of nitrogen) in pepper, curciimin (color value) of the paprika, are inadequate in their precision and accuracy. Deficiencies of these methods are discussed, and the value of newer instrumental methods of analyses, such as infrared, visible, and ultraviolet spectrometry, gas chromatography, and thinlayer chromatography, are illustrated.

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