Phenolic Monoterpenes Conversion of Conobea scoparioides Essential Oil by Hydrotalcite Synthesized from Blast-Furnace Slag

Author:

Rebelo Monaliza M.1,Andrade Eloisa Helena A.1ORCID,Corrêa José Augusto M.2ORCID,Maia José Guilherme S.3ORCID

Affiliation:

1. Programa de Pós-Graduação em Química, Universidade Federal do Pará, Belém 66075-110, PA, Brazil

2. Programa de Pós-Graduação em Geologia e Geoquímica, Universidade Federal do Pará, Belém 66075-110, PA, Brazil

3. Programa de Pós-Graduação em Ciências Farmacêuticas, Universidade Federal do Pará, Belém 66075-110, PA, Brazil

Abstract

Conobea scoparioides (Plantaginaceae) is an herbaceous plant known as “pataqueira” that grows wild in seasonally wet areas of the Amazon region. It is used for aromatic baths and anti-protozoan remedies by the Brazilian Amazon native people. The main volatile compounds identified in the essential oil of “Pataqueira” were the phenolic monoterpenes thymol and thymol methyl ether and their precursors, the monoterpene hydrocarbons α-phellandrene and p-cymene. A hydrotalcite synthesized from blast-furnace slag exhibited a 3:2 (Mg/Al) molar ratio, and this layered double hydroxide (LDH) was evaluated as a catalyst in converting the main monoterpenes of the “Pataqueira” oil. This action significantly increased the thymol content, from 41% to 95%, associated with the percentual reduction in other main components, such as thymol methyl ether, α-phellandrene, and p-cymene. The LDH reaction showed a strong tendency towards producing hydroxylated derivatives, and its behavior was similar to the hypothetical plant biosynthetic pathway, which leads to the production of the monoterpenes of “Pataqueira” oil. Thymol and its derivatives are potent antiseptics applied in pharmaceutical and hygienic products as antibacterial, antifungal, and antioxidant properties, among others. The present work reports a natural source with a high thymol content in aromatic plants from the Amazon, with evident economic value.

Publisher

MDPI AG

Reference36 articles.

1. Evaluation of gold on alumina catalyst deactivation dynamics during α-pinene isomerization;Solkina;Chem. Eng. J.,2011

2. Database of the Amazon aromatic plants and their essential oils;Maia;Quim. Nova,2009

3. Maia, J.G.S., Zoghbi, M.G.B., and Andrade, E.H.A. (2001). Plantas Aromáticas da Amazônia e Seus Óleos Essenciais, Museu Paraense Emílio Goeldi, Coleção Adolpho Ducke.

4. Antiprotozoal activities of Colombian plants;Weniger;J. Ethnopharmacol.,2001

5. Óleos essenciais da Amazônia contendo timol;Morais;Acta Amaz.,1972

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3