UNTERSUCHUNGEN ÜBER DIE EXTRAKTION DES ROTEN KOBER-FARBSTOFFS DURCH ORGANISCHE LÖSUNGSMITTEL ZUR ÖSTROGENBESTIMMUNG IM HARN

1960 ◽  
Vol XXXV (I) ◽  
pp. 34-48 ◽  
Author(s):  
Gerd Ittrich
Keyword(s):  
Menstrual Cycle ◽  
Organic Solvents ◽  
Urine Sample ◽  
Phenol Derivatives ◽  
Organische Lösungsmittel ◽  
Colour Complex

ABSTRACT A series of organic solvents and phenol derivatives have been examined for the extraction of the pink Kober-colour complex. Optimal results could be achieved for fluorimetry by a solution of 2 % (w/v) p-nitrophenol and 1 % (v/v) ethanol in acetylenetetrabromide, when the green mercury line (546 mμ was used as primary light. The sensitivity, stability and specificity have been improved, compared with the previously described reaction. By changing the sequence of purification steps and by reducing the volume of the urine sample (5 ml) the method for the determination of total oestrogens has been simplified. Approximately 10 determinations can be done within 3–4 hours by one person. Recovery experiments and comparative determinations with a previously described method have been carried out. The excretion of total oestrogens in a complete menstrual cycle is determined with the described method.

Generic method for determination of volatile organic solvents in cosmetics

2014 ◽  
Vol 32 (11) ◽  
pp. 1251
Author(s):  
Jing DA ◽  
Xianglu HUANG ◽  
Gangli WANG ◽  
Jin CAO ◽  
Qingsheng ZHANG
Keyword(s):  
Organic Solvents ◽  
Volatile Organic

Micro-Determination of p-Hydroxybenzoic Esters in Pharmaceuticals and Cosmetics

1977 ◽  
Vol 60 (1) ◽  
pp. 56-59 ◽  
Author(s):  
Emil Weisenberg ◽  
Baruch Gershon ◽  
Judith Schoenberg
Keyword(s):  
Liquid Chromatography ◽  
Phosphate Ester ◽  
Specific Method ◽  
Gas Liquid Chromatography ◽  
Direct Extraction ◽  
Flame Photometric Detector ◽  
Phenol Derivatives ◽  
Margin Of Error ◽  
Diethyl Phosphate

Abstract A rapid and specific method is described for the determination of microamounts of methyl, propyl, and butyl p-hydroxybenzoic esters (parabens) in pharmaceuticals and cosmetics. The method involves the direct extraction of parabens into benzene or chloroform followed by derivatization with phosphorochloridate. The diethyl phosphate ester derivatives are cleaned up on a Florisil minicolumn and finally measured by gas-liquid chromatography on 5% OV-210 on Gas-Chrom Q. A flame photometric detector or a KCl thermionic detector may be used. The concentration response was linear up to 40 ng parabens. The reproducibility and margin of error were tested with fortified samples. This method may be applied to the estimation of other phenol derivatives.

Development and Validation of a Green Analytical Method for the Determination of Norfloxacin in Raw Material by FTIR Spectrophotometry

2016 ◽  
Vol 99 (6) ◽  
pp. 1533-1536 ◽  
Author(s):  
Jéssica Sayuri Hisano Natori ◽  
Eliane Gandolpho Tótoli ◽  
Hérida Regina Nunes Salgado
Keyword(s):  
Urinary Tract ◽  
Organic Solvents ◽  
Analytical Method ◽  
Environmentally Friendly ◽  
Raw Material ◽  
Waste Generation ◽  
Ftir Spectrophotometry ◽  
Tract Infections ◽  
Development And Validation

Abstract Norfloxacin is a broad-spectrum antimicrobial agent, widely used in humans and animals for the treatment of urinary tract infections. It is a second-generation fluoroquinolone. Several analytical methods to analyze norfloxacin have been described in the literature. However, most of them are complex and require the use of large amounts of organic solvents. This paper describes the development and validation of a green analytical method for the determination of norfloxacin in raw material by FTIR spectrophotometry. This method does not require the use of organic solvents, minimizing waste generation in the process and its environmental impacts. The development of methods that promote the reduction, prevention, or elimination of waste generation has become highly attractive to the pharmaceutical industry because of the growing demand from civil society and government authorities for environmentally friendly products and services. The FTIR spectrophotometry method was validated according to International Conference on Harmonization guidelines, showing adequate linearity (r = 0.9936), precision, accuracy, and robustness. This validated method can be used as an environmentally friendly alternative for the quantification of norfloxacin in raw material in QC routine analysis.

Association of serum progesterone level and endometrial estradiol & progesterone receptors in women with unexplained recurrent miscarriage

QJM ◽  
2021 ◽  
Vol 114 (Supplement_1) ◽  
Author(s):  
Ihab Found Alam ◽  
Sherif Ahmed Ashoush ◽  
Ihab Adel Gomaa ◽  
Ahmed Sabry AbdEl-Hafeez
Keyword(s):  
Menstrual Cycle ◽  
Recurrent Miscarriage ◽  
Progesterone Receptors ◽  
First Trimester ◽  
Endometrial Biopsy ◽  
Serum Progesterone ◽  
Normal Endometrium ◽  
History Of ◽  
Unexplained Recurrent Miscarriage

Abstract This study investigated the endometrial tissue to study the fluctuation of estrogen receptors (ERs) and progesterone receptors (PRs) in women with recurrent miscarriage compared with normal endometrium of fertile women. Forty women were divided into two groups: 20 non-pregnant women with history of recurrent miscarriage (who had three or more first- trimester miscarriages) and 20 controls. Both groups had regular ovulatory menses and proven fertility. Endometrial biopsy was taken in the two groups during the luteal phase of the menstrual cycle, between the 8th and the 10th postovulatory days using an endometrial biopsy curette for determination of estrogen (E2) and progesterone (P4) hormones levels and their receptors. On the same day as the biopsy, a blood sample was taken for determination of estradiol (E2) and progesterone (P4) levels. The obtained results showed no significant differences between both groups regarding age, BMI, menarche, menstrual cycle & menstruation, significant decrease in E2 and P4 levels in the serum and endometrial biopsy of recurrent miscarriage women versus control. In control and recurrent miscarriage; ER levels in cytoplasm and salt extracted nucleus were higher than PR levels. ER and PR values were higher in the nuclear compartment than in the cytoplasmic compartment. The women with early recurrent miscarriage showed lower levels of both ER and PR significantly. All types of endometrial receptors (ER &PR) and hormones (E2 &P4) in serum and endometrium showed correlation relating to number of previous miscarriages.

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