نتایج جستجو برای: hplc apci

تعداد نتایج: 33470  

Journal: :Rapid communications in mass spectrometry : RCM 2003
Joachim Schuhmacher Dieter Zimmer Frank Tesche Volker Pickard

Some cases of occurrence of matrix effects (mostly ion suppression) in protein-precipitated plasma samples, and their influence on the validity of plasma concentrations and pharmacokinetic parameters, are discussed. The comparison of matrix effects using either electrospray (TurboIonspray, TISP) or atmospheric pressure chemical ionization (APCI) indicated that APCI is less prone to matrix effec...

Journal: :Journal of the American Society for Mass Spectrometry 2009
Koffi Badjagbo Pierre Picard Serge Moore Sébastien Sauvé

Real-time monitoring of benzene, toluene, ethylbenzene, and xylenes (BTEX) in ambient air is essential for the early warning detection associated with the release of these hazardous chemicals and in estimating the potential exposure risks to humans and the environment. We have developed a tandem mass spectrometry (MS/MS) method for continuous real-time determination of ambient trace levels of B...

Journal: :Environmental Pollution 2021

Particulate matter with aerodynamic diameter ?2.5 ?m (PM 2.5 ) concentrations vary between countries similar carbon dioxide (CO 2 emissions, which can be partially explained by differences in air pollution control efficacy. However, no indicator of efficacy has yet been developed. We aimed to develop such an indicator, and evaluate its global temporal distribution association country-level heal...

از مهمترین متابولیت‌ها در زعفران آپوکاروتنوئیدهای کروستین و کروسین می باشند. رنگ زعفران بطور عمده به میزان و کیفیت حضور ماده کروسین بستگی دارد که خود فرم استری گلیکوزیله شده ماده کروستین توسط آنزیم گلیکوزیل ترانسفراز می باشد. در این مطالعه به جداسازی و شناسایی این متابولیت‌ها در عصاره متانولی و کلرفرمی کلاله زعفران در مرحله گرده افشانی با دستگاه کروماتوگرافی مایع مجهز به طیف سنجی‌ جرمی (LC-APCI...

Journal: :Journal of oleo science 2015
Qingxin Zhou Jie Xu Shu Yang Yong Xue Ting Zhang Jingfeng Wang Changhu Xue

Esterified astaxanthins are used as functional nutraceuticals and pigments in many food products. Unfortunately, the utilization is currently limited due to their chemical instability and poor water-solubility. In this study, esterified astaxanthins were quantified and purified from Haematococcus pluvialis using a novel and precise approach. By HPLC-(+)APCI-MS/MS, twenty esterified astaxanthin ...

Journal: :Talanta 2012
S Vo Duy P B Fayad B Barbeau M Prévost S Sauvé

A new coating material was used for a stir bar sorptive extraction (SBSE) method coupled to a high throughput sample analysis technique. This allowed for a simple procedure for fast determinations of eight steroid hormones (estriol, estradiol, ethynylestradiol, estrone, progesterone, medroxyprogesterone, levonorgestrel, northindrone) in water. Sample pre-treatment was performed using an in-hous...

2017
Pamela Hasslöf Frida Karlsson Videhult Sven Arne Silfverdal Christina E. West Christina Stecksén-Blicks

Pregnancy and post-partum represent a period of susceptibility for vitamin D insufficiency. This study investigated S-25 [OH] D levels in women in northern Sweden 4 weeks post-partum and its association with selected background factors. Blood from 100 healthy women were analyzed for iron status and serum levels of S-25[OH] D using ionization-mass spectrometry (HPLC-APCI-MS). ˂50 nmol/L was cate...

1999
E. Pittenauer J. Bailer K. Widhalm G. Allmaier

Introduction. Edible oils containing > 60 % monoenoic acids (i. e. oleic acid), in particular olive oil and Canola oil have been shown to exhibit beneficial effects on lipid metabolism in human (LDL-cholesterol blood levels, triacylglycerol blood levels) within the last few years [1]. These findings are in contrast to earlier recommandations by nutrition experts who strongly favored high-linole...

Journal: :The Analyst 2012
Bienvenida Gilbert-López Juan F García-Reyes Cordula Meyer Antje Michels Joachim Franzke Antonio Molina-Díaz Heiko Hayen

A Dielectric Barrier Discharge Ionization (DBDI) LC/MS interface is based on the use of a low-temperature helium plasma, which features the possibility of simultaneous ionization of species with a wide variety of physicochemical properties. In this work, the performance of LC/DBDI-MS for trace analysis of highly relevant species in food and environment has been examined. Over 75 relevant specie...

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