Evidence map›Paper›PMID 29333616›Full record

ArticleJournal of clinical laboratory analysis2018

Determination of vitamins K

Eva Klapkova, Jana Cepova, Katerina Dunovska, Richard Prusa

Open access · bronzeAbstract read
In one paragraph

Article in Journal of clinical laboratory analysis, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 17 papers.

0numbers the graph read from it
0cells of the map it votes in
17citing papers in PubMed
1.2field-weighted citation impact, top 23% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

17 citing papers in PubMed, 38 citations in OpenAlex.

  1. Article
  2. Review
  3. Vitamin K and women's health: a review.Frontiers in global women's health · 2025
    Review
  4. Article
  5. Article
  6. Article
  7. Review
  8. Article
  9. Article
  10. Role of Vitamin K in Bone and Muscle Metabolism.Calcified tissue international · 2023
    Review
  11. Article
  12. [Serum vitamin KZhongguo dang dai er ke za zhi = Chinese journal of contemporary pediatrics · 2022
    Article
  13. Review
  14. Review
  15. Review
  16. Article
  17. Determination of vitamins KJournal of clinical laboratory analysis · 2018
    Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

4 authors at 1 institution in 1 country.

Eva KlapkovaDepartment of Medical Chemistry and Clinical Biochemistry, Charles University, 2nd Faculty of Medicine and University Hospital Motol, Prague, Czech Republic.ORCID http://orcid.org/0000-0002-9903-5662
Jana CepovaDepartment of Medical Chemistry and Clinical Biochemistry, Charles University, 2nd Faculty of Medicine and University Hospital Motol, Prague, Czech Republic.
Katerina DunovskaDepartment of Medical Chemistry and Clinical Biochemistry, Charles University, 2nd Faculty of Medicine and University Hospital Motol, Prague, Czech Republic.
Richard PrusaDepartment of Medical Chemistry and Clinical Biochemistry, Charles University, 2nd Faculty of Medicine and University Hospital Motol, Prague, Czech Republic.
Charles University · CZ

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundNew high-performance liquid chromatography (HPLC) method was developed for the determination of vitamin K

methodsVitamin K was determined by HPLC with fluorescence detection after postcolumn zinc reduction. The detection was performed at 246 nm (excitation) and 430 nm (emission). The internal standard and 2 mL of ethanol were added to 500 μL of serum. The mixture was extracted with 4 mL of hexane, and solid phase extraction was then used.

resultsThe HLPC method was fully validated. The intra- and interday accuracy and precision were evaluated on two QC samples by multiple analysis, and CV were less than 10%. The limit of quantification for MK-4 was found at 0.04 ng/mL, for K

conclusionNew HPLC method for the determination of vitamins K

Indexed as

FluorescenceChromatography, High Pressure LiquidFemaleHumansPostmenopauseTime FactorsVitamin K 1Vitamin K 2Vitamin K 1Vitamin K 2HPLCmenaquinonesMK-4MK-7phylloquinonevitamin K

Identifiers

PMID29333616
PMCPMC6816853
OpenAlexW2782775026

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.