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Academic Papers

Kynurenic Acid (KYNA) and Quinolinic Acid (QUIN) (2,3-pyridinedicaroxylic acid)

  • 07 June 2023

Kynurenic Acid (KYNA) and Quinolinic Acid (QUIN) (2,3-pyridinedicaroxylic acid) The most common causes of elevated kynurenic acid are the use of tryptophan supplements. Other causes may include vitamin B6 deficiency and high homocysteine concentrations. Increased homocysteine level can also cau

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Serotonin (5-hydroxytryptamine, 5-HT)

  • 11 July 2023

Serotonin Serotonin (5-hydroxytryptamine, 5-HT) is a tryptophan derived biogenic amine that acts as a neurotransmitter in the central and peripheral nervous systems in the body. It controls many brain functions, regulates blood pressure and smooth muscle contraction. It has been strongly implic

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Rapid and Reliable 25-OH Vitamin D2 and 25-OH Vitamin D3 Measurements by Multitasker LC-MS/MS

  • 09 May 2018

The 25-OH Vitamin D2 and 25-OH Vitamin D3 measurement method was validated using a Zivak Multitasker Fully Automated Sample Preparation and Injection System coupled with a MS detector. Please click 'DOWNLOAD PDF' to read the entire paper.

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Pomological Features, Nutritional Quality, Polyphenol Content Analysis, and Antioxidant Properties of Domesticated and 3 Wild Ecotype Forms of Raspberries (Rubus idaeus L.)

  • 03 November 2017

Experiments were performed by a Zivak®HPLC and Zivak®Tan-dem Gold Triple quadrupole (Istanbul, Turkey) mass spectrometry. Please click 'DOWNLOAD PDF' to read the entire paper.

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Antioxidant activity and polyphenol content of cherry stem (Cerasus avium L.) determined by LC–MS/MS

  • 02 November 2017

Experiments were performed with Zivak® HPLC and Zivak® Tandem Gold Triple quadrupole (Istanbul, Turkey) mass spectrometer. Please click 'DOWNLOAD PDF' to read the entire paper.

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LC–MS/MS analysis, antioxidant and anticholinergic properties ofgalanga (Alpinia officinarum Hance) rhizomes

  • 03 November 2017

Experiments were performed by a Zivak®HPLC and Zivak®Tan-dem Gold Triple quadrupole (Istanbul, Turkey) mass spectrometry Please click 'DOWNLOAD PDF' to read the entire paper.

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Antioxidant activity and phenolic compounds of ginger (Zingiber officinale Rosc.) determined by HPLC-MS/MS

  • 03 November 2017

Experiments were performed by a Zivak®HPLC and Zivak®Tan-dem Gold Triple quadrupole (Istanbul, Turkey) mass spectrometry. Please click 'DOWNLOAD PDF' to read the entire paper.

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Polyphenol contents and in vitro antioxidant activities of lyophilised aqueous extract of kiwifruit (Actinidia deliciosa)

  • 03 November 2017

Experiments were performed by a Zivak®HPLC and Zivak®Tan-dem Gold Triple quadrupole (Istanbul, Turkey) mass spectrometry. Please click 'DOWNLOAD PDF' to read the entire paper.

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Polyphenol Contents and Antioxidant Properties of Medlar (Mespilus germanica L.)

  • 03 November 2017

Experiments were performed by a Zivak®HPLC and Zivak®Tan-dem Gold Triple quadrupole (Istanbul, Turkey) mass spectrometry. Please click 'DOWNLOAD PDF' to read the entire paper.

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