Reference health
Simple and Rapid UV Spectrophotometry of Caffeine in Tea Coupled with Sample Pre-treatment Using a Cartridge Column Filled with Polyvinylpolypyrrolidone (PVPP)
22/22 checkable references clean · checked 2026-07-23
Every reference with a DOI in the deposited reference list resolved to a known work in Crossref or DataCite at the dated check, and none carried a retraction, withdrawal, or removal notice.
4 without a DOI — not checked. A reference deposited without a DOI is never matched by title or guessed at; it stays outside the checked set, and this line discloses that.
The 22 checked references that resolve
resolves10.1016/S0021-9673(99)00418-5
Rapid analysis of methylated xanthines in teas by an improved high-performance liquid chromatographic method using a polyvinylpolypyrroridone pre-column
resolves10.1016/0165-0173(92)90012-B
Caffeine and the central nervous system: mechanisms of action, biochemical, metabolic and psychostimulant effects
resolves10.2105/AJPH.80.9.1106
Caffeine-containing beverages, total fluid consumption, and premenstrual syndrome.
resolves10.1002/1097-0142(19880301)61:5<1051::AID-CNCR2820610533>3.0.CO;2-8
Caffeine ingestion and breast cancer.A negative correlation
resolves10.1016/S0021-9673(99)01345-X
Analysis of tea components by high-performance liquid chromatography and high-performance capillary electrophoresis
resolves10.1016/j.foodchem.2005.11.021
Simultaneous analysis of purine alkaloids and catechins in Camellia sinensis, Camellia ptilophylla and Camellia assamica var. kucha by HPLC
resolves10.1016/0021-9673(96)00456-6
Simultaneous analysis of individual catechins and caffeine in green tea
resolves10.1016/S0021-9673(01)00903-7
Decrease in concentration of free catechins in tea over time determined by micellar electrokinetic chromatography
resolves10.1002/1522-2683(200011)21:17<3634::AID-ELPS3634>3.0.CO;2-O
Analysis of catechins and caffeine in tea extracts by micellar electrokinetic chromatography
resolves10.1021/jf970147i
Determination of Caffeine in Tea Products by an Improved High-Performance Liquid Chromatography Method
resolves10.1016/S0021-9673(00)95059-3
High-performance liquid chromatographic determination of theobromine, theophylline and caffeine in food products
resolves10.1016/S0003-2670(03)00862-6
Simultaneous determination of methylxanthines in coffees and teas by UV-Vis spectrophotometry and partial least squares
resolves10.1016/S0026-265X(03)00095-X
Determination of caffeine in black tea leaves by Fourier transform infrared spectrometry using multiple linear regression
resolves10.1248/cpb.55.1393
Improved Sample Pre-treatment for Determination of Caffeine in Tea Using a Cartridge Filled with Polyvinylpolypyrroridone (PVPP)
resolves10.1016/S0003-2670(00)81263-5
UV spectrophotometric determination of theobromine and caffeine in cocoa beans
The 4 references without a DOI — listed, not checked
no DOI — not checked4
no DOI — not checked10
no DOI — not checked11
no DOI — not checked18
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