scholarly journals Chemical composition and antioxidant activity of Psidium guajava L. leaves

2021 ◽  
Vol 13 (3) ◽  
pp. 66-70
Author(s):  
Thi Bach Le ◽  
Tien Dung Le ◽  
Trong Tuan Nguyen ◽  
Xuan Canh Do ◽  
Chan Du Lam ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Chemical Composition ◽  
Protocatechuic Acid ◽  
Mekong Delta ◽  
Psidium Guajava ◽  
Viet Nam ◽  
Spectroscopic Techniques ◽  
Natural Sources ◽  
Chemical Structures ◽  
Chromatographic Techniques

Guava, Psidium guajava L., is well-known tropic tree which is abundantly grown for fruit. It belongs to phylum Magnoliophyta, class Magnoliopsida and Myrtaceae family and has been found a lot in the Mekong Delta of Viet Nam. Antioxidant activity of different extracts from Psidium guajava L. leaves revealed that ethyl acetate and n-butanol extracts have the good activities. Processing of these fractions using repeated column and thin layer chromatographic techniques resulted in the isolation of four compounds, which have identified their chemical structures by spectroscopic techniques including avicularin (1), kaempferol (2), gallic acid (3), and protocatechuic acid (4). All the isolated compounds showed antioxidant activity using DPPH and ABTS scavenging assays. These results suggest that the leaves of guava  would be useful natural sources of antioxidants.

scholarly journals Purification, Characterization, and Antioxidant Activity of Daucosterol and Stigmasterol from Prangos ferulacea

2020 ◽  
Vol 10 (2) ◽  
pp. 2174-2180
Keyword(s):  
Antioxidant Activity ◽  
Structure Elucidation ◽  
Antiradical Activity ◽  
Bioactive Metabolites ◽  
Spectroscopic Techniques ◽  
Chromatographic Techniques ◽  
Phytochemical Investigation ◽  
Antioxidant Agents ◽  
Wide Range ◽  
Ft Ir

The genus Prangos is traditionally used for medicinal and food purposes. This genus contains a wide range of bioactive metabolites. In this work, phytochemical investigation and antioxidant activity evaluation of Prangos ferulacea were carried out. Chromatographic techniques were employed for the purification of extracts components. Spectroscopic techniques such as NMR, FT-IR, together with elemental analysis, were used for the structure elucidation of isolated compounds. Stigmasterol, daucosterol, and salicylic acid were purified and identified. Isolated compounds showed moderate to high antiradical activity in DPPH antioxidant assay. Results indicated the potential of P. ferulacea as a source of steroid and their glycosides and also its possible applications as antioxidant agents.

Chemical composition and antioxidant activity of seven cultivars of guava (Psidium guajava) fruits

2015 ◽  
Vol 170 ◽  
pp. 327-335 ◽  
Author(s):  
Gema Flores ◽  
Shi-Biao Wu ◽  
Adam Negrin ◽  
Edward J. Kennelly
Keyword(s):  
Antioxidant Activity ◽  
Chemical Composition ◽  
Psidium Guajava

scholarly journals Chemical Composition and Antioxidant Activity of the Main Fruits Consumed in the Western Coastal Region of Ecuador as a Source of Health-Promoting Compounds

Antioxidants ◽  
2019 ◽  
Vol 8 (9) ◽  
pp. 387 ◽  
Author(s):  
Mabel Guevara ◽  
Eduardo Tejera ◽  
María G. Granda-Albuja ◽  
Gabriel Iturralde ◽  
Maribel Chisaguano-Tonato ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Chemical Composition ◽  
Vitamin C ◽  
Acid Content ◽  
Sugar Content ◽  
Coastal Region ◽  
Psidium Guajava ◽  
Total Phenolic ◽  
Phytelephas Aequatorialis ◽  
Health Promoting

We studied 19 different tropical fruits traditionally consumed in the coastal lowlands of Ecuador to determine their chemical composition and antioxidant activity. Carambola (Averrhoa carambola L.) had the highest total phenolic, flavonoid, and total antioxidant capacity values, whereas guava fruits (Psidium guajava L.) had the highest vitamin C values. The main organic acids identified were lactic, citric, and acetic acids, and the highest amount of lactic acid was found in soursop fruits (Annona muricata L.), whereas Ecuadorian ivory palm (Phytelephas aequatorialis Spruce) and guava fruits had the highest acetic acid content. Guava also had the highest citric acid content; the highest concentration of oxalic acid was found in carambola. In terms of sugar content, giant granadilla (Passiflora quadrangularis L.) had the highest values of glucose, and red mombin (Spondias mombin L.) had the largest values for fructose and guava for sucrose. Chili pepper (Capsicum chinense Jacq) proved to be the main source of carotenoids, lutein, and β-carotene, anthocyanins, and vitamin C. The results here increase our knowledge regarding the composition of the main fruits consumed on the west coast of Ecuador to facilitate recommendations as potential sources of health-promoting compounds.

scholarly journals Antioxidant Flavonoids from Asteriscus Maritimus

2017 ◽  
Vol 12 (3) ◽  
pp. 1934578X1701200
Author(s):  
Habiba Daroui-Mokaddem ◽  
Ahmed Kabouche ◽  
Naima Boutaghane ◽  
Claude-Alain Calliste ◽  
Jean-Luc Duroux ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Flavonol Glycoside ◽  
Spectroscopic Techniques ◽  
Dpph Radical ◽  
Antioxidative Effect ◽  
H Nmr ◽  
Chemical Structures ◽  
Electronic Spin ◽  
Spin Resonance ◽  
C Nmr

One new flavonol glycoside, patuletin-7- O-[6- O-caffeoyl-2- O-[(S)-3-hydroxyisobutanoyl]glucopyranoside] (astermaritimoside) (1) and four known flavonoids, patuletin-7- O-β-[-6- O-[( S)-3-hydroxyisobutanoyl]glucopyranoside] (2), patuletin-7- O-[6- O-caffeoylglucopyranoside] (3), patuletin-7- O-β-D-glucopyranoside (4) and quercetin-3- O-β-rutinoside (5) have been isolated from Asteriscus maritimus (L.) Less. Chemical structures were elucidated by mass spectrometric, and 1H NMR, 13C NMR, COSY, HMQC and HMBC spectroscopic techniques. The antioxidative effect was evaluated using an electronic spin resonance (ESR) method in order to visualize the inhibition of the DPPH radical. The n-butanol fraction was found to possess a remarkable antioxidant activity that was correlated with the total amount of phenolics. The isolated compounds exhibited good antioxidant activity.

scholarly journals Chemical constituents of the propolis from the stingless bee Trigona minor

2019 ◽  
Vol 2 (5) ◽  
pp. 59-62
Author(s):  
Hai Xuan Nguyen ◽  
Mai Thi Thanh Nguyen ◽  
Nhan Trung Nguyen
Keyword(s):  
Chemical Composition ◽  
Chemical Constituents ◽  
Ethanolic Extract ◽  
Stingless Bee ◽  
Spectroscopic Methods ◽  
Natural Sources ◽  
Chemical Structures ◽  
Geographical Regions ◽  
First Time ◽  
Improve Health

Propolis is a natural product produced by bees, and it is a mixture of resins and other bee excretions. The chemical composition of each type of propolis and its associated bioactivities also depend on the geographical regions, its food and the bee species. In Vietnam, propolis has been used in traditional medicine as the remedy to improve health and prevent diseases. From the ethanolic extract of the stingless bee propolis Trigona minor (Meliponini, Apidae), four lignan compounds were isolated. Their chemical structures were determined as (+)-isolariciresinol (1), 5-methoxy-(+)- isolariciresinol (2), (+)-lyoniresinol (3), and 6-(4- hydroxy-3-methoxyphenyl)-3,7-dioxabicyclo[3.3.0] octan-2-one (4) by spectroscopic methods as well as comparing with data in the literature. Among them, compound 4 was the first isolated from natural sources, while others were isolated for the first time from this stingless bee propolis.

Chemical Composition and Antioxidant Activity of Two Wild Edible Mushrooms from Turkey

2015 ◽  
Vol 17 (12) ◽  
pp. 1179-1188 ◽  
Author(s):  
Suat Ekin ◽  
Yusuf Uzun ◽  
Kenan Demirel ◽  
Mahire Bayramoglu ◽  
Hatice Kiziltas
Keyword(s):  
Antioxidant Activity ◽  
Chemical Composition ◽  
Edible Mushrooms ◽  
Wild Edible Mushrooms

Growth and Mineral Nutrition in Salt Stressed Guava ( Psidium guajava L.) cv . Allahabad Safeda

2016 ◽  
Vol 3 (1) ◽  
Author(s):  
ANSHUMAN SINGH ◽  
ASHWANI KUMAR ◽  
R.K. YADAV ◽  
ASHIM DUTTA ◽  
D.K. SHARMA
Keyword(s):  
Electrical Conductivity ◽  
Chemical Composition ◽  
Plant Height ◽  
Salinity Tolerance ◽  
Soil Ph ◽  
High Salinity ◽  
Psidium Guajava ◽  
Sodium Adsorption Ratio ◽  
Saline Soils ◽  
Experimental Soil

Guav a cv . Allahabad Safeda w as grown in saline soils and irrigated with the best av ailable w ater -1 -1 + -1 (EC 2.8 dS m ). Based on chemical composition (pH- 7.1, EC - 2.8 dS m , Na - 20.04 meq l and IW IW sodium adsorption ratio- 4.86), irrigation w ater w as categorized as marginally saline. The soil pH 2 -1 w as mostly below 8.5 but mean electrical conductivity (EC ) v alues ranged from 0.5-2 dS m 2 indicating moderate to high salinity in the experimental soil. After one-y ear of experimentation, fiv e plants randomly selected from each treatment and the data w ere recorded. Plant height -1 -1 significantly increased (LSD 5%) with increase in salinity from 0.5 dS m to 1.4 dS m . A similar -1 trend w as noted with respect to stem girth. The av erage plant height at 0.5, 0.9 and 1.4 dS m salinity lev els w as 98.3 cm, 108.3 cm and 123 cm, respectiv ely whereas the corresponding stem girth v alues -1 w ere 2.24 cm, 2.28 cm and 2.46 cm. At 2 dS m salinity ,how ev er , both av erage plant height (94.6 cm) and stem girth (2.24 cm) significantly decreased and w ere found to be comparable to control (0.5 dS -1 + -1 m ) v alues. Plants show ed negligible Na accumulation in leav es up to 1.4 dS m salinity , but -1 + exposure to elev ated salinity (2 dS m ) significantly increased leaf Na (0.16% DW). These data -1 indicated a salinity tolerance (EC )threshold of about 1.5 dS m inguav a cultiv ar Allahabad Safeda.

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