Banca de DEFESA: TAINÁ OLIVEIRA DOS ANJOS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : TAINÁ OLIVEIRA DOS ANJOS
DATE: 31/08/2022
TIME: 14:00
LOCAL: videoconferência
TITLE:

PIPERACEAE FROM UTINGA STATE PARK: CHEMICAL STUDY AND BIOLOGICAL ACTIVITIES OF ESSENTIAL OILS OF SELECTED SPECIES OF Piper L. and Peperomia Ruiz & Pav.

KEY WORDS:

Piperaceae. Chemical profile. PEUt. DPPH. TEAC. Allelopathy.

PAGES: 68
BIG AREA: Ciências Biológicas
AREA: Botânica
SUMMARY:

The Piperaceae family is widely studied because of the genera Piper L. and Peperomia Ruiz & Pav, which besides being the most representative of the family, constitute an important source of raw material of natural resources and knowledge because both have species that produce essential oils and thus present diverse biological and chemical properties. The present study aimed to catalog species of Piper and Peperomia in the ecological trails of Utinga State Park, Belém, Pará, and to evaluate the chemical composition and biological activities of the essential oils (EO) from the leaves of pre-selected Piper and Peperomia species. The EOs will be extracted by hydrodistillation and the chemical composition will be analyzed by gas chromatography coupled to mass spectrometry (GC/MS).To evaluate the antioxidant potential we used the DPPH free radical scavenging method and Trolox Equivalent Antioxidant Capacity (TEAC). The phytotoxic potential was evaluated on two bioindicator species that are weeds from pasture areas common in the Amazon region: Mimosa pudica (malícia) and Senna obtusifolia (mata-pasto). The floristic survey carried out showed that no species were found for Peperomia Ruiz & Pav during the periods in which the collections were made. In the floristic survey for the genus Piper L, 16 species were found, five of which are endemic to Brazil and are only recorded as occurring in the North and Northeast regions. Besides, the 16 species have not been evaluated by the National Center for the Conservation of Flora (CNCFlora). The yield of EOs obtained from the dried leaves of P. aduncum was 2.67%, P. divaricatum was 0.68%, P. hostmannianum had 1.79% and P. wachenheimii 0.90%. The major constituents in the EO of P. aduncum were dilapiol (64.03%), (E)-β-ocimene (8.4%) and piperitone (4.65%). Whereas for P. divaricatum, they were eugenol (26.93%), methyleugenol (19.11%), (E)-β-ocimene (10.81%), acetyleugenol (9.25%), (E)-caryophyllene (7.78%), germacrene D (6.97%) and β-elemene (9.93%). P. hostmannianum, showed linalool (21.54%), β-pinene (20.03%), (E)- myophyllene (15.05%) and (E)-α-bergamotene (6.96%). Finally, P. wachenheimii showed linalool (32.34%), myrcene (14.89%), limonene (9.77%), (E)-myophyllene (6.67%), β-pinene (4.78%) and α-pinene (4.61%). The antioxidant capacity test for P. divaricatum and P. wachenheimii, were different, P. divaricatum was above the standard (1mM Trolox) for both tests (TEAC and DPPH), while P. wachenheimii, was above the standard only for DPPH. Furthermore, this was the first recorded antioxidant capacity test for P. wachenheimi. The OE phytotoxicity test of P. aduncum and P. hostmannianum showed considerable differences in the germination and development of the radicle and hypocotyl of M. pudica and S. obtusifolia. Thus, the species presented show great phytotoxic potential, showing promise for the formulation of natural biocides.Finally, this work not only expanded the knowledge for Peperomia Ruiz & Pav and Piper L present in PEUt , but also showed that there are still many studies to be performed and new biological potentialities to be discovered.

BANKING MEMBERS:
Presidente - 093.380.802-00 - ELOISA HELENA DE AGUIAR ANDRADE - MPEG
Interno - 244.112.991-00 - LEANDRO VALLE FERREIRA - INPA
Externo à Instituição - OBERDAN OLIVEIRA FERREIRA - UFPA
Externa à Instituição - MÁRLIA REGINA COELHO FERREIRA