Cosmetics. Analytical methods. Validation criteria for analytical results using chromatographic techniques

2012 ◽  
Keyword(s):  
Analytical Methods ◽  
Chromatographic Techniques ◽  
Analytical Results ◽  
Validation Criteria

Analytical Results on a Chaotic Piecewise-Linear O.D.E.

1984 ◽  
Vol 39 (4) ◽  
pp. 342-348
Author(s):  
B. Uehleke ◽  
O. E. Rössler
Keyword(s):  
Analytical Methods ◽  
Hormonal Regulation ◽  
Piecewise Linear ◽  
New Method ◽  
Analytical Results

A variant to the well known Danziger-Elmergreen equation of hormonal regulation is analyzed geometrically by analytical methods. The new method of Poincaré half maps is employed. Several chaotic regimes are found.

scholarly journals Supplemental Material: Syn-collisional magmatic record of Indian steep subduction by 50 Ma

2020 ◽  
Author(s):  
Yue Qi ◽  
QIANG WANG ◽  
et al.
Keyword(s):  
Cross Section ◽  
Analytical Methods ◽  
Southern Tibet ◽  
Analytical Results ◽  
Geological Cross Section

Analytical methods, field geological cross-section, and analytical results for the Lopu Range batholith from southern Tibet.

Pyrethrin I and II: Their insecticidal value and estimation in Pyrethrum (Chrysanthemum cinebariaefolium). I

1929 ◽  
Vol 19 (2) ◽  
pp. 266-296 ◽  
Author(s):  
F. Tattersfield ◽  
R. P. Hobson ◽  
C. T. Gimingham
Keyword(s):  
Analytical Methods ◽  
Toxic Substance ◽  
Insufficient Data ◽  
Positive Correlation ◽  
Analytical Results ◽  
External Conditions ◽  
Direct Toxicity ◽  
Chrysanthemum Cinerariaefolium

1. (a) Pyrethrin I and II have been isolated by the method of Staudinger and Ruzicka from the insecticidal plant Pyrethrum (Chrysanthemum cinerariaefolium). Both are shown to be highly toxic to the insectAphis rumicis.(b) Pyrethrin I was found to be the most toxic substance so far tested by us and, as it was about ten times as toxic to these insects as pyrethrin II, it is concluded that it is mainly responsible for the contact insecticidal value of pyrethrum.2. Two micro-analytical methods of determining the pyrethrin content are described, (a) By means of the acids after hydrolysis, (b) By means of the semicarbazone. They are given on pp. 278, 282.3. The analytical results obtained for a series of pyrethrum samples agreed with their observed insecticidal properties toAphis rumicis.4. Comparisons of the pyrethrin contents, as estimated, with the results of direct toxicity experiments both on the pyrethrum samples and the pure pyrethrins, confirm the validity of the analytical methods.5. There was a significant and positive correlation, in the samples tested, between the amounts of pyrethrin I and II.6. Insufficient data are available to show a significant correlation between the size of flower-heads and the content of poison, or to draw conclusions as to the effect of external conditions such as soil, weather or age of bed.

Evaluation of Four Analytical Methods to Detect Weevils in Wheat: Granary Weevil, Sitophilus granarius (L.), in Soft White Wheat

1988 ◽  
Vol 51 (7) ◽  
pp. 547-553 ◽  
Author(s):  
GERALD E. RUSSELL
Keyword(s):  
Analytical Methods ◽  
Sitophilus Granarius ◽  
Insect Infestation ◽  
Granary Weevil ◽  
X Ray ◽  
White Wheat ◽  
Controlled Conditions ◽  
Analytical Results ◽  
Flotation Method

Soft white wheat was infested with adult granary weevils under controlled conditions at 3 levels of infestation, and samples were removed for testing 6 times over a total of 48 d. Three analytical methods available for use in FDA laboratories were compared along with a simple counting of the visually-detectable, insect-damaged kernels in a 100-g sample. The objective of the study was to determine how the analytical results compared with one another and with the levels of infestation. Data confirmed that the more rapid visual exam of wheat is not reliable for indicating the hidden, internally-developing weevils. Analysts should be aware of the possibility that wheat inspected visually could be passable with respect to insect-damaged kernels, but still may produce violative flour due to high insect fragment counts when processed. More research is needed to correlate insect infestation in wheat with insect fragment counts in flour. The two methods which could be used to estimate potential flour contamination caused by weevils are the x-ray exam and the cracking and flotation method, since both of these reveal the stages of weevil development inside the kernels. Tables present the results of the analyses and relate them to the number and sex of the founding adults in each level of infestation.

scholarly journals DEVELOPMENT AND VALIDATION OF METHAMPHETAMINE ANALYSIS IN SALIVA USING GAS CHROMATOGRAPHY-TANDEM MASS SPECTROMETRY

2018 ◽  
Vol 10 (1) ◽  
pp. 97
Author(s):  
Yahdiana Harahap ◽  
Muhammad Rezqi Hakim ◽  
Kuswardani Soedigdo
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Sample Preparation ◽  
Analytical Methods ◽  
Mobile Phase ◽  
Tandem Mass ◽  
Chromatography Tandem Mass Spectrometry ◽  
Validation Criteria ◽  
Inner Diameter ◽  
Development And Validation

Objective: The aim of this study was to develop and validate analytical methods for determining methamphetamine in saliva using gas chromatographytandemmass spectrometry (MS).Methods: The chromatography conditions were DB MS-5 capillary columns with a length of 30 m, inner diameter of 0.25 mm, mobile phase of Heliumgas 99.999%, flow rate of 0.8 mL/min, detection of MS at m/z values of 58.00 and 91.00, respectively, and ephedrine HCl as the internal standard.Results: The validation of analytical methods for methamphetamine satisfies the validation criteria by the EMEA Guidelines 2011. Bioanalyticalmethods obtained were linear in the concentration range from 15.0 to 300.0 ng/mL with r>0.9999. Sample preparation was done using liquid–liquidmicroextraction with cyclohexane, supernatant residue was dried and reconstituted with approximately 100 μL of methanol.Conclusion: The method was successfully applied to saliva samples of methamphetamine users with levels in the range of test.

scholarly journals Validation of Analytical Methods Based on Chromatographic Techniques: An Overview

2015 ◽  
pp. 1757-1808 ◽  
Author(s):  
Juan Peris-Vicente ◽  
Josep Esteve-Romero ◽  
Samuel Carda-Broch
Keyword(s):  
Analytical Methods ◽  
Chromatographic Techniques

scholarly journals Supplemental Material: Late Eocene post-collisional magmatic rocks from the southern Qiangtang terrane record the melting of pre-collisional enriched lithospheric mantle

2021 ◽  
Author(s):  
Yue Qi ◽  
Qiang Wang ◽  
et al.
Keyword(s):  
Early Cretaceous ◽  
Lithospheric Mantle ◽  
Analytical Methods ◽  
Late Eocene ◽  
Mafic Rocks ◽  
Magmatic Rocks ◽  
Analytical Results ◽  
Qiangtang Terrane

Analytical methods and analytical results for the Early Cretaceous and late Eocene mafic rocks in the southern Qiangtang terrane.

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