Determination of m-Cresol and p-Cresol in Industrial Cresols by Raman Spectrometer

Raman Spectrometer ◽

Gc Analysis

Adopting raman spectrometer to conduct qualitative and quantitative analysis of m-cresol and p-cresol, selecting the respective character peak of bencycloquidium after deformation vibration (m-cresol at 732 cm-1 and p-cresol at 841 cm-1), via experiment and calculations, the relative raman cross section of m-cresol and p-cresol can be concluded:(∂σ/∂Ω)732cm-1/(∂σ/∂Ω)1000cm-1 is 0.74 (height-fitting of the peak), and 0.61 (area-fitting of the peak). This method samples simply and rapidly, and has a short testing time, whose quantitative analysis result of m-/p-cresol is consistent with that of GC analysis.

Determination of Flavonoids Compounds of Three Species and Different Harvesting Periods in Crataegi folium Based on LC-MS/MS

Molecules ◽

10.3390/molecules26061602 ◽

2021 ◽

Vol 26 (6) ◽

pp. 1602

Author(s):

Ya-Ping Guo ◽

Hong Yang ◽

Ya-Li Wang ◽

Xiao-Xiang Chen ◽

Ke Zhang ◽

...

Keyword(s):

Quantitative Analysis ◽

Qualitative Analysis ◽

Quantitative Method ◽

Total Content ◽

Pharmacological Activities ◽

Time Saving ◽

First Time

Crataegi folium have been used as medicinal and food materials worldwide due to its pharmacological activities. Although the leaves of Crataegus songorica (CS), Crataegus altaica (CA) and Crataegus kansuensis (CK) have rich resources in Xinjiang, China, they can not provide insights into edible and medicinal aspects. Few reports are available on the qualitative and quantitative analysis of flavonoids compounds of their leaves. Therefore, it is necessary to develop efficient methods to determine qualitative and quantitative flavonoids compounds in leaves of CS, CA and CK. In the study, 28 unique compounds were identified in CS versus CK by qualitative analysis. The validated quantitative method was employed to determine the content of eight flavonoids of the leaves of CS, CA and CK within 6 min. The total content of eight flavonoids was 7.8–15.1 mg/g, 0.1–9.1 mg/g and 4.8–10.7 mg/g in the leaves of CS, CA and CK respectively. Besides, the best harvesting periods of the three species were from 17th to 26th September for CS, from 30th September to 15th October for CA and CK. The validated and time-saving method was successfully implemented for the analysis of the content of eight flavonoids compounds in CS, CA and CK for the first time.

Qualitative and quantitative determination of trace aldehydes and ketones in food preservative propionic acid for quality improvement

Analytical Methods ◽

10.1039/d1ay00742d ◽

2021 ◽

Author(s):

Yiwen Cao ◽

Shenjie Zhu ◽

Lin Zhang ◽

Qun Cui ◽

Haiyan Wang

Keyword(s):

Quality Improvement ◽

Quantitative Analysis ◽

Quantitative Determination ◽

Propionic Acid ◽

Food Preservative ◽

Aldehydes And Ketones ◽

Aldehyde Content

Aiming at the difficulty in qualitative and quantitative analysis of trace compositions in food preservative propionic acid, the trace compositions and the key components influencing the total aldehyde content in...

X-Ray Fluorescence in Cotton Modification Research

Advances in X-ray Analysis ◽

10.1154/s0376030800003347 ◽

1964 ◽

Vol 8 ◽

pp. 456-461

Author(s):

Donald Mitcham ◽

Biagio Piccolo ◽

Verne W. Tripp ◽

Robert T. O’Connor

Keyword(s):

Quantitative Analysis ◽

Cotton Textile ◽

X Ray ◽

Textile Materials ◽

Chemically Modified ◽

Elapsed Time

AbstractThe application of X-ray fluorescence to the qualitative and quantitative analysis of chemically modified cotton textile materials is described. The scope and flexibility of the technique have permitted the determination of more than 20 elements with, greatly reduced elapsed time compared with the corresponding spectroscopic or wet methods. Precautions to be observed in preparing standards are discussed. Results of the analysis of typical modifications and their significance in the development of cottons for specific uses are described.

Application of optical microscopy for the qualitative and quantitative analysis of the solid surface

Nanostructures Mathematical Physics and Modelling ◽

10.31145/2224-8412-2020-20--2-41-64 ◽

2020 ◽

Vol 20 (2) ◽

pp. 41-64

Author(s):

A.A. Dedkova ◽

◽

M.A. Makhiboroda ◽

Keyword(s):

Quantitative Analysis ◽

Optical Microscopy ◽

Surface Relief ◽

Complex Analysis ◽

Dark Field ◽

Surface Measurements ◽

Defects Analysis

The possibilities of optical microscopy for preliminary and complex analysis of structures, which are used mainly in microelectronics and micromechanics, are demonstrated. Specific examples of the use of optical microscopy for qualitative and quantitative analysis, development of technological processes, control of defects, analysis of surface relief, determination of the parameters of structures are given. Surface measurements are performed in reflected and transmitted light, using bright and dark field modes.

Chain Length Determination of Fatty Acids by Raman Spectroscopy

Canadian Journal of Chemistry ◽

10.1139/v73-581 ◽

1973 ◽

Vol 51 (23) ◽

pp. 3901-3904 ◽

Cited By ~ 12

Author(s):

Charles H. Warren ◽

Donald L. Hooper

Keyword(s):

Fatty Acids ◽

Raman Spectroscopy ◽

Quantitative Analysis ◽

Long Chain Fatty Acids ◽

Odd Order ◽

Length Determination ◽

Long Chain

For saturated long chain fatty acids, as for hydrocarbons, the odd order "accordion mode" vibrations are Raman active. These "accordion mode" vibrations have been used to provide qualitative and quantitative analysis of mixtures of acids in the range C12–C24.

Simultaneous Determination of 12 Coumarins in Bamboo Leaves by HPLC

Journal of AOAC International ◽

10.5740/jaoacint.12-441 ◽

2013 ◽

Vol 96 (5) ◽

pp. 942-946 ◽

Cited By ~ 10

Author(s):

Shuying Wang ◽

Feng Tang ◽

Yongde Yue ◽

Xi Yao ◽

Qi Wei ◽

...

Keyword(s):

Quantitative Analysis ◽

Simultaneous Determination ◽

Maximum Concentration ◽

Bamboo Leaves ◽

Coumarin Compounds ◽

Interday Precision ◽

Dendrocalamus Giganteus

Abstract A simple, rapid, and sensitive HPLC-UV method was developed for qualitative and quantitative analysis of 12 coumarin compounds (skimin, scopolin, scopoletin, umbelliferone, 6,7-dimethoxycoumarin, coumarin, psoralen, xanthotoxin, 5,7-dimethoxycoumarin, pimpinellin, imperatorin, and osthole) in bamboo leaves. The samples were extracted with ethanol–water (70 + 30, v/v) by ultrasonication and purified by Florisil SPE. The method was validated for linearity, LOD, LOQ, accuracy, precision, and recovery. The standard curves in the corresponding ranges had good linearity. LOD was at the range of 0.19 to 0.85 mg/kg and LOQ 0.64 to 2.82 mg/kg. The values of RSD for accuracy and intraday and interday precision were less than 3%, except for 6,7-dimethoxycoumarin. Recoveries from spiked samples at 30, 20, and 10 mg/kg in Dendrocalamus giganteus Munro were higher than 70%, except for scopoletin, 6,7-dimethoxycoumarin, and coumarin. The method was validated using field-collected samples taken from Beijing and Changning Counties, SiChuan, China. Six coumarins, namely, skimin, scopolin, scopoletin, umbelliferone, coumarin, and pimpinellin, were found in the extracts of 11 species of bamboo leaves. The concentrations of total coumarins were in the range of 8.67 to 99.2 mg/kg. The maximum concentration of total coumarins was found in Bambusa pervariabilis, and the minimum was in Phyllostachys spectabilis.

Determination of Maltol and Ethyl Maltol in Apple Juice by Gas-Liquid Chromatography

Journal of AOAC INTERNATIONAL ◽

10.1093/jaoac/51.5.959 ◽

1968 ◽

Vol 51 (5) ◽

pp. 959-963

Author(s):

S W Gunner ◽

B Hand ◽

M Sahasrabudhe

Keyword(s):

Liquid Chromatography ◽

Quantitative Analysis ◽

Ethyl Acetate ◽

Apple Juice ◽

Internal Standard ◽

Gas Liquid Chromatography ◽

Trimethylsilyl Derivatives

Abstract The qualitative and quantitative analysis of maltol and ethyl maltol in apple juice is described. The compounds were extracted with ethyl acetate and, after the addition of 2,6-dimethoxyphenol as internal standard, they were analyzed by gas-liquid chromatography as such or as their trimethylsilyl derivatives. Recovery of maltol and ethyl maltol was dependent on the method of isolation and ranged from 92 to 97.5% in the method of choice

Improving Student Understanding of Qualitative and Quantitative Analysis via GC/MS using a Rapid SPME-Based Method for Determination of Trihalomethanes in Drinking Water

Journal of Chemical Education ◽

10.1021/acs.jchemed.6b00939 ◽

2017 ◽

Vol 94 (8) ◽

pp. 1129-1132 ◽

Cited By ~ 2

Author(s):

Shu Rong Huang ◽

Peter T. Palmer

Keyword(s):

Drinking Water ◽

Quantitative Analysis ◽

Student Understanding ◽

Qualitative And Quantitative

ANALISIS CEMARAN LOGAM BERAT MERKURI DALAM KRIM PEMUTIH WAJAH YANGBEREDAR DIPASAR TRADISIONAL DENGAN METODE SPEKTROFOTOMETRI SERAPANATOM

Journal of Pharmacopolium ◽

10.36465/jop.v1i1.395 ◽

2018 ◽

Vol 1 (1) ◽

Author(s):

Vina Juliana Anggraeni

Keyword(s):

Quantitative Analysis ◽

Atomic Absorption ◽

Atomic Absorption Spectrophotometer ◽

Accuracy Test ◽

Percent Recovery ◽

Traditional Market ◽

Precision Test

Mercury is one of the most dangerous chemicals that is often added to whitening cream. There are many manufacturers or sellers of whitening cream who use mercury in their products even though it is use is prohibited. This research conducted a qualitative and quantitative analysis of mercury on five samples of whitening cream in the traditional market. Qualitative analysis was performed using KI reagent and showed five samples containing mercury. Then, the determination of mercury in the sample by Atomic Absorption Spectrophotometer at a wavelength of 243,7 nm. From the validation result, the regression equation obtained from the calibration curve is Y = 0,016779x - 0,04377 with LOD and LOQ of 2,1552 µg/L and 7,184 µg/L. The accuracy test is indicated by the percent recovery is in the range 88-97% and the precision test is shown with the % RSD value of 0,044-1,57%. The quantitative analysis results of five samples showed that all samples contained mercury levels range from 51,576 ppm to 3886,776 ppm. Keywords:Whitening cream;Mercury;Atomic Absorption Spectrophotometer.