Výsledky vyhledávání - "Helena R. Pezza"

Akademický článek

Determination of ambroxol in syrups using diffuse reflectance spectroscopy

Autor: José L. Rufino, Joel M. Santos, Mayra A. Rodrigues, Helena R. Pezza, Leonardo Pezza

Publikováno v: Química Nova, Vol 32, Iss 6, Pp 1513-1516 (2009)

This paper reports an analytical method for the determination of ambroxol in micellar medium by spot test-diffuse reflectance spectroscopy. The reflectance measurements were performed analyzing the colored compound (λ= 520 nm) produced from the reac

Externí odkaz: https://doaj.org/article/25bff6d260684c1a8e23b0377300452f

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Akademický článek

Flow-injection spectrophotometric determination of tetracycline and doxycycline in pharmaceutical formulations using chloramine-T as oxidizing agent

Autor: José L. Rufino, Patrícia L. Weinert, Helena R. Pezza, Leonardo Pezza

Publikováno v: Química Nova, Vol 32, Iss 7, Pp 1764-1769 (2009)

A flow-injection (FI) spectrophotometric procedure is proposed for tetracycline (TC) and doxycycline (DXC) determination in pharmaceuticals. The method is based on the reaction of oxidation of these drugs by chloramine-T in alkaline medium producing

Externí odkaz: https://doaj.org/article/47ae638b688449538af4bda5db720353

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Relationship Between the Different Aspects Related to Coffee Quality and Their Volatile Compounds

Autor: Paulo R A B, Toledo, Leonardo, Pezza, Helena R, Pezza, Aline T, Toci

Publikováno v: Comprehensive reviews in food science and food safetyReferences. 15(4)

This paper provides, for the first time, an overview of different aspects related to the quality of coffee beans and their volatile fractions: species/cultivars, geographic origins, bean defects, and types of beverages, processing, roasting, and stor

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=pmid________::58b4d6505e10adfa309854b2baddf1e9
https://pubmed.ncbi.nlm.nih.gov/33401840

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