Thermostructural behavior of red cochineal dye stabilized with sucrose and embedded in a silica xerogel matrix

Martı́nez, J. R.; Velázquez-Pérez, S.E.; Guerrero-Serrano, A. L.; Espericueta, D.; Ortega-Zarzosa, G.; Herrera‐González, Ana M.; Hernández, Francisco Velasco; Guerrero, A. Lobo

doi:10.1016/j.physb.2020.412438

Cited by 5 publications

(1 citation statement)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand, the absorption band at 853 cm −1 corresponds to β-D-glucose, while the bands observed at 671 and 550 cm band located at 884 cm −1 . The bands that arise between 758 to 532 cm −1 are due to the rocking C-H, out-of-plane bending C-OH, out-of-plane wagging C-H, and several skeletal vibration modes of aromatic systems [45][46][47][48]. Table 5 lists the main vibrational modes for the mucilage and the cochineal dye.…”

Section: Infrared Spectroscopymentioning

confidence: 99%

Electrochemical evaluation of mucilage and cochineal pigments as a hybrid film coating on aluminum surfaces

López¹,

Sánchez²,

Guerrero-Serrano³

et al. 2022

Mater. Res. Express

View full text Add to dashboard Cite

This work deals with the electrochemical evaluation of a hybrid coating based on mucilage and prickly pear cochineal (Dactylopius coccus) for corrosion protective applications. The Opuntia streptacantha mucilage was extracted by grinding prickly pear cochineal, and three coatings containing mucilague (CM), cochineal-mucilage (CMC), and cochineal-mucilage without Tween 80 (CMC-T) were formulated. The aluminum working electrodes (WE) were coated by immersion and then left to dry for 72 hours at room temperature. The formed coats were assessed by electrochemical impedance spectroscopy, electrochemical noise, and potentiodynamic polarization curves after 24, 72, and 168 hours of immersion in a 3.5 wt% NaCl solution. These electrochemical measurements were performed in triplicate to check reproducibility. The Tween 80 plasticizer-free cochineal-mucilage-based hybrid coating reveals more excellent protection against corrosion than uncoated aluminum. Optical micrographs were used to set apart the conditions of the hybrid coating after its valuation, which show the protection of the metallic surface on which it was not coated. Results showed that the hybrid coating has suitable properties as a barrier against corrosion due to its ability to block the aggressive species diffusion by trapping them in the coating structure, which prevents their contact with the metal surface. This property is attributable to better mucilage and cochineal film homogeneity. Also, it acts as a corrosion inhibitor due to its semi-permeable behavior where only water molecules flow through its pores. This hybrid coating showed an excellent corrosion-resistant behavior to be used to protect aluminum.

show abstract

Section: Infrared Spectroscopymentioning

confidence: 99%