scholarly journals Exposure to perfluoroalkyl substances in waste recycling workers: Distributions in paired human serum and urine

2022 ◽  
Vol 158 ◽  
pp. 106963
Author(s):  
Lin Peng ◽  
Wang Xu ◽  
Qinghuai Zeng ◽  
Feiyun Sun ◽  
Ying Guo ◽  
...  
Keyword(s):  
Human Serum ◽  
Waste Recycling ◽  
Perfluoroalkyl Substances ◽  
Serum And Urine

Isolation and Measurement of Pancreatic Amylase in Human Serum and Urine

1972 ◽  
Vol 18 (12) ◽  
pp. 1493-1497 ◽  
Author(s):  
L Fridhandler ◽  
J Edward Berk ◽  
M Ueda
Keyword(s):  
Acute Pancreatitis ◽  
Human Serum ◽  
Fallopian Tube ◽  
Normal Subjects ◽  
Pancreatic Amylase ◽  
Salivary Amylase ◽  
Tissue Homogenates ◽  
Quantitative Procedure ◽  
Lines Of Evidence ◽  
Serum And Urine

Abstract We describe a sensitive quantitative procedure for separating isoamylases in human serum, urine, and tissue homogenates. Two components have been discerned with chromatographic characteristics resembling those of pancreatic and salivary amylases, respectively. Several lines of evidence—derived from studies in normal subjects, pancreatectomized patients, and patients with acute pancreatitis—indicate that the pancreas is probably the source of the component in serum and urine that exhibits characteristics of pancreatic amylase. The source of the component resembling salivary amylase has not yet been fully defined. Isoamylase analysis of extracts of fallopian tube and liver revealed two amylase components with chromatographic properties similar to pancreatic and salivary amylases, respectively.

scholarly journals Per- and polyfluoroalkyl substances in human serum and urine samples from a residentially exposed community

2017 ◽  
Vol 106 ◽  
pp. 135-143 ◽  
Author(s):  
Rachel Rogers Worley ◽  
Susan McAfee Moore ◽  
Bruce C. Tierney ◽  
Xiaoyun Ye ◽  
Antonia M. Calafat ◽  
...  
Keyword(s):  
Human Serum ◽  
Urine Samples ◽  
Polyfluoroalkyl Substances ◽  
Serum And Urine ◽  
Serum And Urine Samples

A highly selective colorimetric assay for the determination of creatinine in biological samples using gluconic acid capped silver nanoparticles after ionic liquid based dispersive liquid phase microextraction

2021 ◽  
pp. 1-8
Author(s):  
Susan Sadeghi ◽  
Mohadeseh Hosseinpour-Zaryabi
Keyword(s):  
Silver Nanoparticles ◽  
Ionic Liquid ◽  
Liquid Phase ◽  
Human Serum ◽  
Gluconic Acid ◽  
Ag Nps ◽  
Liquid Phase Microextraction ◽  
Relative Standard ◽  
Serum And Urine

A dispersive liquid-phase microextraction method combined with UV–vis spectrophotometry was utilized to highly selective determination of creatinine in human serum and urine samples. To overcome the interferences in complex matrices, creatinine reacted with 1,4-naphthoquinone-2- potassium sulfonate reagent to produce a red coloured product that could be extracted into a small volume of 1-hexyl-3-methylimidazolium hexafluorophosphate ([HMIM]PF6) ionic liquid solvent. To increase the sensitivity of the assay, gluconic acid capped silver nanoparticles (Ag NPs) were used. On addition of Ag NPs to the red coloured extracted product, the solution turned to blue accompanied with a red shift in wavelength around 620 nm that could be detected by the naked eye. The effective variables on the determination of creatinine such as concentration of the reagent, amount of formic and hydrochloric acids, type and volume of the extractant, and concentration of Ag NPs were investigated. Under the optimal conditions, the calibration plot was bimodal with linear ranges from 0.1 to 1.5 µg mL−1 and 1.5 to 105 µg mL−1 creatinine with a limit of detection 0.1 µg mL−1. The relative standard deviation for five measurements at 35 µg mL−1 concentration level was 3.8%. The newly developed assay was used for the determination of creatinine in human serum and urine specimens with satisfactory results.

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