Marolo (Annona crassiflora Mart.): a study of value chain and processing

Corrêa, Síntia Carla; Rezende, Marcelo Lacerda; Ferreira, Eric Batista; Azevedo, Luciana

doi:10.1590/s0101-20612013005000044

Cited by 5 publications

(4 citation statements)

References 13 publications

(14 reference statements)

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“…The world is presently over-dependent on a few plant species (Correa et al. 2013 ). Diversification of production and consumption habits to include a broader range of plant species, particularly those currently identified as under-utilized, could significantly contribute to improve health and nutrition, livelihoods and ecological sustainability.…”

Section: Introductionmentioning

confidence: 99%

Antioxidant and antimicrobial activities of ethanol and aqueous extracts fromUrtica urens

Mzid

Khedir

Salem

et al. 2017

Pharmaceutical Biology

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Context: Urtica urens L. (Urticaceae) is an important and commonly used plant for its medicinal and pharmacological properties. Objective: We analyzed the antioxidant and antimicrobial activities of the leaves of Urtica urens in ethanol (EtOH) and water (WA) solvents, employing standard analytical methods. Materials and methods: Polyphenol, flavonoid and tannin content of Urtica urens leaves were determined, after their extraction, using EtOH (70%) and WA extracts as well as the antioxidant (DPPH, ABTS, β-carotene and FRAP) and the antibacterial (via the method of dilution tests) activities of EtOH and WA extracts. Results: The 70% EtOH of Urtica urens showed the highest values of total phenolic (31.41 mg GAE/g DW), flavonoids (6.81 mg quercetin/g DW), tannin (8.29 mg GAE/g DW) and TEAC (560 mmol Trolox/g DW), compared to the WA. The results of DPPH for EtOH (95.56%) were higher than that of WA (64.56%) at a concentration of 40 mg/L. The extracts displayed a FRAP 106.23 for EtOH and 30.55 μmol Fe(II)/g DW for WA. The results clearly indicated that EtOH was the strongest radical scavenger (IC50 = 245.65 ± 10.2 μg/mL). Ethanol was the most effective with minimum inhibitory concentration (MIC) < 250 μg/mL. WA has no antibacterial activity. Discussion and conclusion: The results indicate that leaves of Urtica urens could be used as natural antioxidant and antimicrobial agents.

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Section: Introductionmentioning

confidence: 99%

Antioxidant and antimicrobial activities of ethanol and aqueous extracts fromUrtica urens

Mzid

Khedir

Salem

et al. 2017

Pharmaceutical Biology

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“…Combustors based on lean premixed flames generate substantially lower NOx emissions than equivalent nonpremixed or stoichiometric premixed systems [1]. For that reason, there has been considerable recent interest in the development of fuel-flexible premixed turbine combustors that are capable of burning lean hydrogen or hydrogen-enriched lean hydrocarbon fuels (e.g., [2][3][4][5]).…”

Section: Introductionmentioning

confidence: 99%

“…For that reason, there has been considerable recent interest in the development of fuel-flexible premixed turbine combustors that are capable of burning lean hydrogen or hydrogen-enriched lean hydrocarbon fuels (e.g., [2][3][4][5]). For these fuels, is it expected that NOx is produced primarily through the thermal mechanism [1,6], and the reduction in emissions is believed to be a direct consequence of the lower postflame gas temperatures.…”

Section: Introductionmentioning

confidence: 99%

Simulation of nitrogen emissions in a premixed hydrogen flame stabilized on a low swirl burner

Bell

Day

Lijewski

2013

Proceedings of the Combustion Institute

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There is considerable interest in developing fuel-flexible, low emissions turbines for power generation. One approach is based on burning a variety of lean premixed fuels with relatively low flame temperatures. Such flames can be stabilized in a low swirl burner configuration, for example, using a variety of fuels such as pure hydrogen and hydrogen-seeded hydrocarbon mixtures. However, many hydrogen-rich fuels are thermodiffusively unstable and burn in cellular flame structures, which can have a significant impact on the local nitrogen chemistry. These cellular burning patterns are characterized by a local enhancement of fuel concentration and a corresponding increase in local flame temperature just downstream. In turn, these regions become sites for enhanced thermal NOx production. The structure of these cells, and their impact on the net emissions of a flame is influenced by the global flame stabilization mechanisms and by local turbulence properties. Here we investigate the role of thermodiffusive instabilities on NOx emissions in the context of a laboratory-scale low swirl burner fueled with a lean hydrogen-air mixture at atmospheric pressure. The simulations show how the cellular burning structures characteristic of lean premixed hydrogen combustion lead to local and global enhancements in the NOx emissions. We quantify the chemical pathways that lead to the formation of NO and N2O, and how they are enhanced within local regions of intense burning.

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“…Antioxidants, nowadays from natural origins are extensively used over the past years. Currently, the whole world is dependent only on a few plant species 8 . In order to diversify and expand the dependency on the plant species, particularly those that are underutilized, improves the health and nutrition, livelihood, and ecological sustainability.…”

mentioning

confidence: 99%

Untitled

2021

IJPSR

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The current study has been conducted to analyze the potential of antioxidant activity found in two species of genus Urtica, i.e., Urtica dioica and Urtica urens. Methodology: The antioxidant analysis was performed on the crude extract of root, stem and leaves of both the plants, employing both non-enzymatic and enzymatic methods. For nonenzymatic antioxidant activity determination, methods such as 2, 2diphenyl-1-picrylhydrazyl (DPPH) free radical scavenging assay and Ferrous Reducing Antioxidant Power (FRAP) were opted, whereas for enzymatic analysis, the specific activity of catalase and ascorbate peroxidase assay was examined. Results and Conclusion: The antioxidant activity found via DPPH assay in U. urens ranges from 32.72±0.22 μg/ml to 43.06±1.12 μg/ml and in U. dioica it ranges from 14.28±0.22 μg/ml to 30.88±0.278 μg/ml, while by using FRAP assay the antioxidant activity range found to be 10.412±2.235 μg/ml to 14.005±2.55 μg/ml and 1.526±0.146 μg/ml to 8.014±1.38 μg/ml in U. urens and U. dioica, respectively. The specific activity of antioxidant enzymes catalase and ascorbate peroxidase were exhibited in a range of 16.11±2.146 U/mg to 26.869±6.811 U/mg and 4.497±0.542 U/mg to 6.28±1.57 U/mg respectively in U. urens, while in U. dioica the catalase and ascorbate peroxidase enzyme specific activities range from 0.49±0.015 U/mg to 0.583±0.0318 U/mg, respectively. The conducted study indicated the better potential of antioxidant activity found in U. urens than in U. dioica.

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Marolo (Annona crassiflora Mart.): a study of value chain and processing

Cited by 5 publications

References 13 publications

Antioxidant and antimicrobial activities of ethanol and aqueous extracts fromUrtica urens

Antioxidant and antimicrobial activities of ethanol and aqueous extracts fromUrtica urens

Simulation of nitrogen emissions in a premixed hydrogen flame stabilized on a low swirl burner

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