Total protein determined in human breast milk by use of coomassie brilliant blue and centrifugal analysis.

1989 ◽  
Vol 35 (10) ◽  
pp. 2127-2129 ◽  
Author(s):  
Y Bergqvist ◽  
L Karlsson ◽  
L Fohlin
Keyword(s):  
Breast Milk ◽  
Total Protein ◽  
Brilliant Blue ◽  
Human Breast Milk ◽  
Human Breast ◽  
Simple Method ◽  
Coomassie Brilliant Blue ◽  
Kjeldahl Method ◽  
Coomassie Brilliant

Abstract This simple method of centrifugal analysis for total protein in human breast milk is based on the change in the wavelength of the absorbance maximum of Coomassie Brilliant Blue G-250 when the dye is bound to protein. Within-run and between-day CVs were 3.8% and 4.8%, respectively. Compared with a micro-Kjeldahl method for determination of total nitrogen, the coefficient of correlation was 0.99.

scholarly journals A novel HPLC column switching method coupled to ICP-MS/QTOF for the first determination of selenoprotein P (SELENOP) in human breast milk

2020 ◽  
Vol 321 ◽  
pp. 126692
Author(s):  
A. Arias-Borrego ◽  
B. Callejón-Leblic ◽  
G. Rodríguez-Moro ◽  
I. Velasco ◽  
J.L. Gómez-Ariza ◽  
...  
Keyword(s):  
Breast Milk ◽  
Column Switching ◽  
Selenoprotein P ◽  
Human Breast Milk ◽  
Human Breast ◽  
Hplc Column ◽  
Icp Ms ◽  
Switching Method

Determination of bisphenol A in human breast milk by HPLC with column-switching andfluorescence detection

2004 ◽  
Vol 18 (8) ◽  
pp. 501-507 ◽  
Author(s):  
Yen Sun ◽  
Miki Irie ◽  
Naoya Kishikawa ◽  
Mitsuhiro Wada ◽  
Naotaka Kuroda ◽  
...  
Keyword(s):  
Breast Milk ◽  
Bisphenol A ◽  
Column Switching ◽  
Human Breast Milk ◽  
Human Breast

Coomassie Brilliant Blue-binding: a simple and effective method for the determination of water-insoluble protein surface hydrophobicity

2016 ◽  
Vol 8 (4) ◽  
pp. 790-795 ◽  
Author(s):  
Yungang Cao ◽  
Jing Zhao ◽  
Youling L. Xiong
Keyword(s):  
Surface Hydrophobicity ◽  
Fluorescence Method ◽  
Brilliant Blue ◽  
Insoluble Protein ◽  
Protein Surface ◽  
Coomassie Brilliant Blue ◽  
Protein Surface Hydrophobicity ◽  
Coomassie Brilliant

A novel Coomassie Brilliant Blue-binding method, which correlated well with the widely accepted ANS fluorescence method (R = 0.95), was developed to determine the surface hydrophobicity of water-insoluble proteins.

scholarly journals Combined quantitative cytophotometric method for staining indolyl and sulfhydryl groups and protein.

1983 ◽  
Vol 31 (7) ◽  
pp. 967-970 ◽  
Author(s):  
Y Nakae ◽  
M Shono ◽  
H Ishizuka
Keyword(s):  
Sulfhydryl Groups ◽  
Brilliant Blue ◽  
Quantitative Histochemistry ◽  
Coomassie Brilliant Blue ◽  
Protein Staining ◽  
Coomassie Brilliant

Sulfenylation with 2-nitrophenylsulfenyl chloride (NPS-Cl), which is specific for tryptophyl and cysteinyl residues in protein, was applied to quantitative histochemistry. By measurement of the absorbance values at 370 nm of sections stained with NPS-Cl, Beer-Lambert's law was found to hold for NPS staining. Treatment of NPS-stained sections with 2-mercaptoethanol (ME) (NPS-ME staining) resulted in sulfenylation of tryptophyl residues only. For determination of the amounts of tryptophyl and cysteinyl residues per unit of protein, protein staining with Coomassie Brilliant Blue (CB) was combined with NPS and NPS-ME staining. CB and NPS-CBB staining also followed Beer-Lambert's law. By measuring the absorbance values at 370 and 650 nm of doubly stained sections, the relative contents of tryptophyl and cysteinyl residues in various tissue proteins were calculated. This method will be useful for the investigation of changes in both protein amount and composition.

scholarly journals Comparison of DAD and FLD Detection for Identification of Selected Bisphenols in Human Breast Milk Samples and Their Quantitative Analysis by LC-MS/MS

2020 ◽  
Vol 103 (4) ◽  
pp. 1029-1042
Author(s):  
Tomasz Tuzimski ◽  
Szymon Szubartowski ◽  
Renata Gadzała-Kopciuch ◽  
Andrzej Miturski ◽  
Monika Wójtowicz-Marzec ◽  
...  
Keyword(s):  
Breast Milk ◽  
Solid Phase ◽  
Array Detector ◽  
Human Breast Milk ◽  
Human Breast ◽  
Bisphenol S ◽  
Fluorescence Detector ◽  
Detection Techniques ◽  
Milk Samples

Abstract Background Determination of bisphenols released from packaging material is undoubtedly a difficult and tricky task, requiring the chemical analyst to develop an individual approach to obtain reliable analytical information. Objective QuECHERS (Quick, Easy, Cheap, Effective, Rugged, and Safe)/dispersive solid-phase extraction (d-SPE) technique and high performance liquid chromatography (HPLC) coupled with modern detection techniques such as diode-array detector (DAD), fluorescence detector (FLD) or tandem mass spectrometry (MS/MS) for the determination of bisphenols such as bisphenol A (BPA), bisphenol S (BPS), bisphenol F (BPF), bisphenol B (BPB), 2-[[4-[2-[4-(Oxiran-2-ylmethoxy)phenyl]propan-2yl]phenoxy] methyl]oxirane (BADGE), 3-[4-[2-[4-(Oxiran-2-ylmethoxy)phenyl]propan-2-yl]phenoxy]propane-1,2-diol (BADGE*H2O), 3-[4-[2-[4-(2,3-Dihydroxypropoxy)phenyl]propan-2-yl]phenoxy]propane-1,2-diol (BADGE*2H2O), 1-Chloro-3-[4-[2-[4-(3-chloro-2-hydroxypropoxy)phenyl] propan-2-yl]phenoxy]propan-2-ol (BADGE*2HCl) in human breast milk samples have been performed. Methods For the analysis of total analytes, prior to the extraction with acetonitrile, a deconjugation step was implemented in a tube by adding 1 mL of the enzymatic solution with the β-Glucuronidase to 5 mL of sample. The mix was homogenized and incubated for 17 h at 37°C. Ten milliliters of acetonitrile, and a QuEChERS salt packet with 4 g anhydrous MgSO4 and 1 g NaCl were added. During the d-SPE step the extract was transferred into tube with 30 mg Z-Sep and 50 mg PSA (and also 150 mg MgSO4 for LC-MS/MS analysis). MeOH–water (20:80, v/v) were added to the dry residue and the extract was reconstituted in 150 µL (25-fold analytes pre-concentration is achieved). Next bisphenols were identified by HPLC-DAD-FLD and quantified by LC-MS/MS equipment. Conclusions During the bisphenols HPLC-DAD-FLD analysis, from 6 min a reinforcement of 15 was used, which allowed analytes to be identified at 750 pg/mL. Application of LC-MS/MS allowed quantification of bisphenols in the range from 2.12 to 116.22 ng/mL in a total 27 human breast milk samples. Highlights First QuEChERS/d-SPE coupled with HPLC-DAD-FLD or LC-MS/MS method for the quantification of bisphenols and its analogues in breast milk Faster and cheaper alternative to traditional extraction methods The method was applied for the first biomonitoring of bisphenols and its analogues in breast milk.

Determination of levofloxacin by HPLC with fluorescence detection in human breast milk

Bioanalysis ◽  
2021 ◽  
Author(s):  
Sıdıka Ertürk Toker ◽  
Gamze Ergin Kızılçay ◽  
Olcay Sagirli
Keyword(s):  
Breast Milk ◽  
Fluorescence Detection ◽  
Limit Of Detection ◽  
Internal Standard ◽  
Reversed Phase ◽  
Calibration Graph ◽  
Human Breast Milk ◽  
Human Breast ◽  
Limit Of Quantification

Aim: A new HPLC method with fluorescence detection has been developed and validated for the determination of levofloxacin, one of the fluoroquinolone class antibiotics, in breast milk. Materials & methods: Chromatographic separation was carried out on a reversed phase C18 column with acetonitrile and 10 mM o-phosphoric acid (25:75,v/v) mobile phase composition. Moxifloxacin was used as internal standard and the peaks were detected by fluorescence detection. Results & conclusion: Calibration graph was found linearly within the range of 2.5–500 ng/ml. Limit of detection and limit of quantification were found to be 0.63 and 2.11 ng/ml, respectively. Mean absolute recovery was 96.18%. The developed method has been successfully applied to the determination of levofloxacin in human breast milk taken from two healthy volunteers.

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