Evidence map›Paper›PMID 30361861›Full record

ArticleJournal of fluorescence2019

On the Discoloration of Methylene Blue by Visible Light.

A Sáenz-Trevizo, P Pizá-Ruiz, D Chávez-Flores, J Ogaz-Parada, P Amézaga-Madrid, A Vega-Ríos, M Miki-Yoshida

Abstract read
PubMed Publisher
In one paragraph

Article in Journal of fluorescence, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 9 papers.

0numbers the graph read from it
0cells of the map it votes in
9citing papers in PubMed
–field-weighted citation impact
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

9 citing papers in PubMed.

  1. Article
  2. Article
  3. Sol-Gel Multilayered Niobium (Vanadium)-Doped TiOMaterials (Basel, Switzerland) · 2024
    Article
  4. Article
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  6. Article
  7. Article
  8. Au nanoparticle-decorated TiORSC advances · 2021
    Article
  9. Review
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

7 authors.

A Sáenz-TrevizoCentro de Investigación en Materiales Avanzados S.C., Miguel de Cervantes 120, Chihuahua, C.P. 31136, Mexico.
P Pizá-RuizCentro de Investigación en Materiales Avanzados S.C., Miguel de Cervantes 120, Chihuahua, C.P. 31136, Mexico.
D Chávez-FloresFacultad de Ciencias Químicas, Universidad Autónoma de Chihuahua, Circuito No. 1 Campus Universitario, C.P. 31125, Chihuahua, Mexico.
J Ogaz-ParadaFacultad de Ciencias Químicas, Universidad Autónoma de Chihuahua, Circuito No. 1 Campus Universitario, C.P. 31125, Chihuahua, Mexico.
P Amézaga-MadridCentro de Investigación en Materiales Avanzados S.C., Miguel de Cervantes 120, Chihuahua, C.P. 31136, Mexico.
A Vega-RíosCentro de Investigación en Materiales Avanzados S.C., Miguel de Cervantes 120, Chihuahua, C.P. 31136, Mexico.
M Miki-YoshidaCentro de Investigación en Materiales Avanzados S.C., Miguel de Cervantes 120, Chihuahua, C.P. 31136, Mexico. mario.miki@cimav.edu.mx.ORCID http://orcid.org/0000-0002-1027-123X

Funding

Consejo Nacional de Ciencia y Tecnología CB-2014 242612
6 · The paper itself

Abstract

The discoloration of methylene blue in aqueous solution was studied under illumination by a fluorescent lamp, LEDs of red, green, and blue light, and a UV-A black light bulb. Overall results showed that methylene blue was discolored with and without the presence of any photoactive semiconductor. Outcomes depended on the combination substrate-light source employed. Photosensitization was assumed as the discoloration mechanism followed upon visible light irradiation. Fluorescence spectroscopy and high-performance liquid chromatography were used to investigate the possible intermediates formed in the irradiated solutions. The detailed nature of formed species was not stablished, but it was proved that the dye molecule photo-bleached and partially defragmented in several intermediates including leuco dyes, demethylated phenothiazine dyes, and probably humic substances. Since the fluorescence intermediates found were similar for most of the irradiated solutions, it was assumed that comparable reactive species were responsible for the discoloration of the molecule in solution. Results proved the misconception of discoloration experiments found in the literature when employing visible light near the absorption region of the dye.

Indexed as

Fluorescence intermediatesMethylene bluePhotosensitizationType I mechanism

Identifiers

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.