Antioxidant, total phenols and proximate constituents of four tropical leafy vegetables

Obeng, Eric; Kpodo, Fidelis M.; Tettey, Clement Okraku; Essuman, Edward Ken; Adzinyo, O.A.

doi:10.1016/j.sciaf.2019.e00227

Cited by 19 publications

(17 citation statements)

References 20 publications

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“…This result may be, and is probably, related to the detailed structure of the specific compounds present in the samples. These results are in line with those previously reported in the literature [31], indicating that FRAP and DPPH are appropriate, little-time-consuming methods with high reproducibility for quickly determining antioxidant activity in raspberry fruit extracts.…”

Section: Correlation Between Tpc and Antioxidant Methodssupporting

confidence: 92%

“…The raspberry extracts had higher ABTS values relative to the DPPH scavenging activity, meaning there may be compounds in the samples that were responsible for the difference. Similar results were obtained by using these three methods in four tropical leafy vegetables [ 31 ]. In this sense, the ABTS assay measures the direct free radical inhibition by all the antioxidants in the raspberry extract (hydrophilic and lipophilic), whereas the DPPH assay is only applicable to hydrophobic systems [ 32 , 33 ].…”

Section: Resultssupporting

confidence: 82%

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Authentication of “Adelita” Raspberry Cultivar Based on Physical Properties, Antioxidant Activity and Volatile Profile

et al. 2020

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Agricultural selection programmes are, today, working hard to obtain novel raspberry cultivars with higher nutritional and commercial quality. One of those cultivars is “Adelita”. This study aims to provide novel tools for raspberry cultivar identification—more specifically, the differentiation of “Adelita” from other raspberry cultivars. To perform this study, five “Adelita” samples were analysed—four cultivated in Spain and one, in Morocco—and they were compared to seven samples from six raspberry cultivars (“P04”, “Lupita”, “Enrosadira”, “P10”, “Quanza” and “Versalles”). The physical parameters (mass, length, equatorial diameter and firmness) combined with the Total Phenolic Content (TPC); the antioxidant capacity according to the antioxidant activity tested with the 2,2-diphenyl-1-picrylhydrazyl (DPPH), ferric-reducing antioxidant power (FRAP) and 2,2-azinobis (3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS) methods; and the main target volatile compounds were used as independent variables. Principal component and cluster analysis showed that the target volatiles and physical parameters together with the TPC and DPPH values could be useful to classify Adelita cultivars separately from the rest of the cultivars included in the work. Those results proved that the developed methodology could be proposed as a reliable approach for the identification of cultivar fraud in the supply chain.

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Section: Correlation Between Tpc and Antioxidant Methodssupporting

confidence: 92%

Section: Resultssupporting

confidence: 82%

Authentication of “Adelita” Raspberry Cultivar Based on Physical Properties, Antioxidant Activity and Volatile Profile

et al. 2020

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“…In the study of Yakoub et al [32] antioxidant activity of water and ethanol extracts of dried leaves of C. olitorius grown in Tunisia was 77.64% and 91.65%, respectively. Obeng et al [33] investigated the antioxidant activity of C. olitorius grown in Ghana after drying the leaves in an oven at 55°C for 6 h. The results showed that methanol extract of C. olitorius inhibited the DPPH radical by %22.20, which is very low than our results. Antimicrobial activities of the extracts obtained from C. olitorius had been decided against 8 different microorganisms by using broth dilution method.…”

Section: Resultscontrasting

confidence: 73%

Comparative Study of Total Phenolic Contents, Antioxidant and Antimicrobial Activities of Different Extracts of Corchorus olitorius L. Growing in North Cyprus

Yücelşengün¹,

Gargi²

2020

Biological Diversity and Conservation

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In this study, antimicrobial and antioxidant activities as well as total phenolic content of dried leaf extracts of Corchorus olitorius grown in North Cyprus were determined. The total phenolic content, antioxidant and antimicrobial activity of the extracts were determined using the Folin-Ciocalteu, DPPH free radical and broth dilution methods, respectively. The antimicrobial activity of the extracts was tested against eight different microorganisms (Bacillus subtilis ATCC 6037, Listeria monocytogenes Scott A, Enterococcus faecalis ATCC 29212, Staphylococcus aureus 6538P, Bacillus cereus No 8, Escherichia coli O157:H7 ATCC 43895, Escherichia coli ATCC 1103, Salmonella Typhimurium NRRL-B-4420). The highest phenolic content was obtained from ethanol extract as 24.61 mg GAE/g. Water, ethanol and methanol extracts of C. olitorius were inhibited the DPPH radical by 17.50%, 87.10% and 86.00%, respectively. MIC values of ethanol and methanol extracts of C. olitorius against test cultures were varied between 50.00% and 6.25%, while no inhibitory effect was observed for water extract. The most susceptible microorganisms to methanol extract of the plant were L. monocytogenes Scott A, E. faecalis ATCC 29212 and B. subtilis ATCC 6037 (MIC value of 6.25%). All these results showed that C. olitorius extracts are important sources showing antimicrobial and antioxidant properties.

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“…The iron reducing ability potential determination method was used to evaluate the antioxidant activity of avocado seed extract, in which the ability of Fe 3+ /Ferricyanide complex to reduce to ferrous (Fe 2+ ) form is measured. The chemical principle is based on the electron transfer reaction, in which potassium ferricyanide is the oxidant, and the antioxidant acts as a reducing agent by supplying hydrogen atoms to the iron complex and will destroy the free radical chain reaction [17].…”

Section: Reducing Powermentioning

confidence: 99%

Developing New Health Material: The Utilization of Spray Drying Technology on Avocado (Persea Americana Mill.) Seed Powder

Alissa

Hung

Hou

et al. 2020

Foods

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Avocado (Persea Americana Mill.) generates byproducts, especially the avocado seeds. Hence, the aim of this study was to investigate the potential utilization of avocado seed as a very important, high phenolic content, climacteric fruit with unique characteristics and high nutritional properties. As such, theantioxidative test is conducted, then spray drying is used to produce avocado seed powder. The objective of this study was to develop an avocado seed powder using the spray drying technique by investigating the solution stability with different avocado seed extract concentrations, and to determine the physical properties of spray dried avocado powder that consists of powder yield, moisture, water activity, solubility, and color. The avocado seed extract was mixed with maltodextrin and water and homogenized for 10 min at 8000 rpm. The avocado seed solution was then spray dried with different inlet temperatures and feed flow rates. The spray dried avocado seed powder was analyzed for its yield, moisture content, water activity, solubility, and color. It was reported that the solution with the least avocado extract concentration (10 g) had the best stability in terms of presence of solute particles and color. The avocado seed powder obtained from this experiment had yield ranges from 24.46–35.47%, moisture content ranges from 7.18–7.96%, water activity ranges from 0.27–0.34, solubility ranges from 55.50–79.67 seconds, L* value ranges from 38.38–41.05, a* value ranges from 6.20–7.25, and b* value ranges from 13.33–15.17. In addition, increasing inlet temperature resulted in an increase in powder yield, solubility, a* value, and b*value, as well as a decrease in moisture, water activity, and L* value. Meanwhile, increasing the feed flow rate resulted in an increase in powder yield, moisture, water activity, and all L*, a*, b* values, as well as a decrease in solubility. In conclusion, spray drying technology is able to develop avocado seed powder.

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Antioxidant, total phenols and proximate constituents of four tropical leafy vegetables

Cited by 19 publications

References 20 publications

Authentication of “Adelita” Raspberry Cultivar Based on Physical Properties, Antioxidant Activity and Volatile Profile

Authentication of “Adelita” Raspberry Cultivar Based on Physical Properties, Antioxidant Activity and Volatile Profile

Comparative Study of Total Phenolic Contents, Antioxidant and Antimicrobial Activities of Different Extracts of Corchorus olitorius L. Growing in North Cyprus

Developing New Health Material: The Utilization of Spray Drying Technology on Avocado (Persea Americana Mill.) Seed Powder

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