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

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 ◽  
Qualitative And Quantitative Analysis ◽  
Qualitative And Quantitative ◽  
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.

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

Molecules ◽  
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 ◽  
Qualitative And Quantitative Analysis ◽  
Pharmacological Activities ◽  
Time Saving ◽  
Qualitative And Quantitative ◽  
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

2021 ◽  
Author(s):  
Yiwen Cao ◽  
Shenjie Zhu ◽  
Lin Zhang ◽  
Qun Cui ◽  
Haiyan Wang
Keyword(s):  
Quality Improvement ◽  
Quantitative Analysis ◽  
Quantitative Determination ◽  
Propionic Acid ◽  
Qualitative And Quantitative Analysis ◽  
Food Preservative ◽  
Qualitative And Quantitative ◽  
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...

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

2012 ◽  
Vol 468-471 ◽  
pp. 1104-1109
Author(s):  
Hui Ying Yu ◽  
Ping Yan
Keyword(s):  
Quantitative Analysis ◽  
Cross Section ◽  
Deformation Vibration ◽  
Testing Time ◽  
Qualitative And Quantitative Analysis ◽  
Raman Spectrometer ◽  
Qualitative And Quantitative ◽  
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.

X-Ray Fluorescence in Cotton Modification Research

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 ◽  
Qualitative And Quantitative Analysis ◽  
X Ray ◽  
Textile Materials ◽  
Qualitative And Quantitative ◽  
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.

Chain Length Determination of Fatty Acids by Raman Spectroscopy

1973 ◽  
Vol 51 (23) ◽  
pp. 3901-3904 ◽  
Author(s):  
Charles H. Warren ◽  
Donald L. Hooper
Keyword(s):  
Fatty Acids ◽  
Raman Spectroscopy ◽  
Quantitative Analysis ◽  
Long Chain Fatty Acids ◽  
Qualitative And Quantitative Analysis ◽  
Qualitative And Quantitative ◽  
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

2013 ◽  
Vol 96 (5) ◽  
pp. 942-946 ◽  
Author(s):  
Shuying Wang ◽  
Feng Tang ◽  
Yongde Yue ◽  
Xi Yao ◽  
Qi Wei ◽  
...  
Keyword(s):  
Quantitative Analysis ◽  
Simultaneous Determination ◽  
Maximum Concentration ◽  
Qualitative And Quantitative Analysis ◽  
Qualitative And Quantitative ◽  
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

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 ◽  
Qualitative And Quantitative Analysis ◽  
Qualitative And Quantitative ◽  
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

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

2018 ◽  
Vol 1 (1) ◽  
Author(s):  
Vina Juliana Anggraeni
Keyword(s):  
Quantitative Analysis ◽  
Atomic Absorption ◽  
Atomic Absorption Spectrophotometer ◽  
Qualitative And Quantitative Analysis ◽  
Qualitative And Quantitative ◽  
Accuracy Test ◽  
Percent Recovery ◽  
Traditional Market ◽  
Precision Test

<p><em>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.</em></p><p> </p><p><strong><em>K</em></strong><strong><em>eywords:</em></strong><em>Whitening cream;Mercury;Atomic Absorption Spectrophotometer.</em></p>

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