scholarly journals Studies on drying characteristic, nutritional composition, and antioxidant properties of Stevia rebaudiana (Bertoni) leaves

2015 ◽  
Vol 29 (3) ◽  
pp. 323-331 ◽  
Author(s):  
Yolanda B. Moguel-Ordóñez ◽  
Diana L. Cabrera-Amaro ◽  
Maira R. Segura-Campos ◽  
Jorge C. Ruiz-Ruiz
Keyword(s):  
Antioxidant Properties ◽  
Reducing Power ◽  
Stevia Rebaudiana ◽  
Biological Properties ◽  
Nutritional Composition ◽  
Antioxidant Compounds ◽  
Drying Methods ◽  
Stevia Rebaudiana Bertoni ◽  
Trolox Equivalent ◽  
Drying Treatment

Abstract Drying characteristics of Stevia rebaudiana (Bertoni) leaves using radiation drying, convection drying, sun drying, and shade drying treatments were investigated in a convective type. Results for all treatments indicated that drying took place in the falling rate period. The chroma of the dried samples ranged between 29.66 and 23.85. Convection and shade drying samples were found better in colour and had the highest content of total pigments. The proximate and fibre composition were affected by the drying treatments. Extracts obtained from convection drying and shade drying leaves exhibited higher values of Trolox equivalent antioxidant capacities 416.89-423.64 mM mg−1 and ferric reducing power 85.19-87.97%. These extracts also showed ion chelating capacity 59.05-60.21% for Cu+2 and 55.05-59.11% for Fe+2. The results indicate that it is possible to select the drying treatment to obtain the best nutritional and biological properties. Convection drying and shade drying were the least aggressive treatments and leaf powders obtained by these drying methods could be used as sources of nutrients, fibre, and antioxidant compounds.

Comparative Evaluation of Onion Germplasm (Allium Cepa L.) Of Bangladesh for Physical And Antioxidant Properties

2021 ◽  
Vol 19 (1) ◽  
pp. 113-123
Author(s):  
PK Dash ◽  
S Das ◽  
MA Mannan ◽  
M Jahan
Keyword(s):  
Free Radicals ◽  
Antioxidant Properties ◽  
Biological Properties ◽  
Physicochemical Analysis ◽  
The Other ◽  
Antioxidant Compounds ◽  
Visual Methods ◽  
Ic50 Value ◽  
Onion Germplasm

Determination of antioxidant activity is one of the key elements for understanding the biological properties of a widely used spice onion (A. cepa). In contrast, physical properties help understand the textural quality of onion necessary for postharvest operations of sorting and grading in particular. Considering the physicochemical importance of onion, the present study focused on the determination of physical attributes and antioxidant content of the onion germplasm in Bangladesh using visual methods and 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay, respectively. The five-onion germplasms (BARI Piaz-2, BARI Piaz-3, BARI Piaz-4, BARI Piaz-5, Faridpuri Vati) collected from selected onion growers of the Department of Agricultural Extension (DAE) of the southwestern part of Bangladesh were used as treatments for physicochemical analysis at the Horticulture laboratory of the Agrotechnology Discipline, Khulna University, Khulna, Bangladesh during the period from February to August 2019. The laboratory study was laid out in Completely Randomized Design (CRD) with three replications. Most of the physical characteristics of onion were highest in germplasm-1 than those of the other germplasm tested. The results showed that the DPPH free radicals were scavenged by all onion germplasm extracts in a concentration-dependent pattern. The highest IC50 value (238.10 ppm) was noticed in germplasm-3 and the lowest in germplasm-5 (161.29 ppm) with no statistical difference from germplasm-4 (172.41 ppm). The lower IC50 value indicating that onion germplasms-5 and -4 extracts were more potent in scavenging free radicals than the other onion germplasms. Thus, the low IC50 value facilitated the germplasm-5 and -4 to be enriched with antioxidant compounds significantly in higher amounts than the others. SAARC J. Agric., 19(1): 113-123 (2021)

scholarly journals Comparative Study on the Nutritional and Antioxidant Components of Fruit Parts of Citrullus lanatus

2020 ◽  
pp. 39-51
Author(s):  
Stanley Kanayochukwu Nnenne ◽  
Kingsley Ikechukwu Ubaoji ◽  
Uchechukwu Chibuzo Ogbodo ◽  
Victor Henry Azubuike Enemor ◽  
Adebayo Afees Oladejo
Keyword(s):  
Citrullus Lanatus ◽  
Antioxidant Properties ◽  
Reducing Power ◽  
Proximate Analysis ◽  
Nutritional Composition ◽  
The People ◽  
Dpph Scavenging Activity ◽  
Student’S T ◽  
Dpph Scavenging ◽  
Student’S T Test

Aim: Citrullus lanatus is a fruit widely consumed for its pulp though incompletely, as its other parts (seed and rind) are discarded and may possibly offer bioactive compounds involved in ameliorating certain disease conditions. Hence, this study aimed at comparatively investigating the nutritional composition and antioxidant properties of the seed, pulp and rind of C. lanatus so as to inform the inclusion of these different parts into the fare of the people. Methodology: Standard analytical methods of Association of Official Analytical Chemists were used to determine proximate, phytochemical, vitamin, mineral and antioxidant aspects of the fruit parts. The results were analyzed using Student’s t-test at .05. Results: The proximate analysis showed a high moisture value in the pulp (93.34 +/- .82) followed by the rind (77.11 +/- 3.44) and the seed (10.00 +/- .48). High crude protein and fiber contents were both noted in the seed followed by the rind and pulp. Mineral determinations revealed potassium to be abundant in the rind (452.31mg/kg) than the seed (305.7mg/kg) and the pulp (100.5mg/kg), followed by calcium occurring more in the rind (292.61mg/kg) than in the pulp (257.21mg/kg) and seed (227.45mg/kg) and then manganese being the least concentrated among the minerals. The investigated phytochemical principles revealed the highest concentration of cardiac glycosides in the seed (14.82 +/- .66) than the rind (1.95 +/- 0.80) and pulp (1.10 +/- 0.17), followed by saponins occurring most in the rind (12.05 +/- 3.91) than the seed (10.17 +/- 0.63) and pulp (.13 +/- .01). The seed had the highest DPPH scavenging activity followed by the rind and pulp respectively. The seed also showed a higher reducing power and lipid peroxidation capacities than the other fruit parts suggesting a potent property for antioxidant activity in the fruit parts of C. lanatus. Conclusion: The findings imply that both seed and rind of C. lanatus can be good sources of nutritional, phytochemical and antioxidant components in addition to the pulp which is commonly consumed and these may be implicated in management of certain diseases with further evidential research.

scholarly journals Antioxidant Properties Research of Various Types of Coffee

Food Industry ◽  
2020 ◽  
Vol 5 (4) ◽  
pp. 74-81
Author(s):  
Dinara Ignatova ◽  
Nadezhda Makarova
Keyword(s):  
Coffea Arabica ◽  
Antioxidant Properties ◽  
Reducing Power ◽  
Coffea Canephora ◽  
Raw Material ◽  
Antioxidant Compounds ◽  
Common Source ◽  
Coffee Arabica ◽  
Coffee Beans ◽  
Dpph Method

The article presents results of antioxidant compounds determination (total amount of phenolic compounds, total amount of flavonoids) and parameters of the antiradical activity (by the DPPH method) and reducing power (by the FRAP method) in different types of coffee beans depending on roasting degree (weak, medium, strong), coffee variety (Robusta and Arabica) and the importing country. The researchers used the products presented in the retail chains of Samara. The study purpose was to reveal a universal and most common source of functional substances with an antioxidant effect for the human body and use it both in its pure form and in combination with other products (BAS). According to the research results, Robusta coffee (Coffea Canephora) of medium roasting from Brazil has high indicators for all the conducted analyses and can be used as an additional source of antioxidant substances, and as a raw material for obtaining BAS. Coffee Arabica (Coffea Arabica) of medium roasting of Indonesian origin has the highest restoring power, and the highest content of phenols and flavonoids. Coffee Arabica (Coffea Arabica) of a strong degree of roasting from India has the lowest rates. All other types of coffee have average, slightly different results.

scholarly journals Determination of in vitro antioxidant activity of the leaves extracts of Ehretia pubescens

2020 ◽  
Vol 11 (4) ◽  
pp. 6262-6267
Author(s):  
Krishnamoorthy Meenakumari ◽  
Giridharan Bupesh ◽  
Mayur Mausoom Phukan
Keyword(s):  
Antioxidant Activity ◽  
Ethyl Acetate ◽  
Radical Scavenging Activity ◽  
Antioxidant Properties ◽  
Radical Scavenging ◽  
Reducing Power ◽  
Biological Properties ◽  
Scavenging Activity ◽  
Reducing Power Assay

The foods from plants were known to ensure against degenerative diseases and maturing because of their antioxidant activitycredited to their high content. Information on antioxidant activity of Indian medicinal plant is abundant. To the best of our knowledge, biological properties have not been accounted in the literature for this species of . As a point, this is the first results to assess the anti-oxidant activity of the plant which belongs to the family . The antioxidant activity of Methanol, , Ethyl acetate and Aqueous extracts of E. was determined using the DPPH free radical scavenging activity, ABTS radical scavenging activity and reducing power assay. The DPPH scavenging activity showed higher activity observed in extract (63%) of E. than (54%), (44%) and aqueous (30%). the ABTS assay inhibition in extract (58%) than (43%), (38%) and aqueous (32%) extracts. The reducing power assay of different extracts was increased in extract (54%) than (40%), (34%) and aqueous (28%) extracts. Overall, the and ethyl acetate extract had higher antioxidant properties than other extract. However, in this study, extracts exhibit great potential for antioxidant activity and may be useful for their nutritional and medicinal functions.

scholarly journals Quality of New Functional Powdered Beverages Enriched with Lyophilized Fruits—Potentially Bioaccessible Antioxidant Properties, Nutritional Value, and Consumer Analysis

2020 ◽  
Vol 10 (11) ◽  
pp. 3668 ◽  
Author(s):  
Justyna Bochnak-Niedźwiecka ◽  
Michał Świeca
Keyword(s):  
Antioxidant Capacity ◽  
Raw Materials ◽  
Antioxidant Properties ◽  
Reducing Power ◽  
In Vitro Digestion ◽  
In Vitro Bioaccessibility ◽  
Trolox Equivalent ◽  
Health Promoting

This study evaluates nutrients and health-promoting compounds responsible for antioxidant capacity in eight novel formulations based on lyophilized fruit and vegetable powders. The composition contained lyophilized carrot, pumpkin, lentil sprouts, raspberry, strawberry, and apple. The effect of functional additives on the antioxidant, nutritional, and functional characteristics of powdered beverages was determined in the powders and after rehydration followed by in vitro digestion. The antioxidant activity, phenols, vitamin C, and reducing power were significantly higher in the powders enriched with additives having potential functional properties. Furthermore, the analyses indicated that all the powdered formulations may be potential sources of total starch (100–112 mg/100 mL) and proteins (125–139 mg/100 mL). The designed powdered beverages after reconstitution exhibited high antioxidant content, reasonable consumer acceptance, and good in vitro bioaccessibility. The best results of antioxidant capacity were obtained for beverages enriched with raspberry, i.e., 10.4 mg Trolox equivalent (TE)/100 mL and 12.1 mg TE/100 mL rehydrated at 20 °C and 80 °C, respectively. Additionally, color characteristics were used as indicators of the quality of the powdered beverages. This research promotes the reduction of food waste, since whole plant tissues are used, thus allowing maximum exploitation of food raw materials; moreover, drying provides stable shelf life.

scholarly journals Antioxidant Capacity and the Correlation with Major Phenolic Compounds, Anthocyanin, and Tocopherol Content in Various Extracts from the Wild EdibleBoletus edulisMushroom

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
Emanuel Vamanu ◽  
Sultana Nita
Keyword(s):  
Antioxidant Capacity ◽  
Antioxidant Properties ◽  
Reducing Power ◽  
Ethanolic Extract ◽  
Edible Mushroom ◽  
Tocopherol Content ◽  
Hot Water ◽  
Antioxidant Compounds ◽  
Methanolic Extracts ◽  
Freeze Dried

Boletus edulisis a wild edible mushroom habitually consumed by rural populations. Ethanolic and methanolic extracts was obtained in cold and hot water from dried fruit bodies. The antioxidant activity of freeze-dried extracts fromB. eduliswere investigated using free radicals scavenging activity, reducing power, metal chelating effect, inhibition of lipid peroxidation, and the identification of antioxidant compounds. The levels of different compounds with antioxidant properties were higher in alcoholic extracts compared with aqueous extracts. Rosmarinic acid was the major phenolic compound, it being identified in a concentration between7±0.23and56±0.15 mg/100 g extract. A positive correlation between the content of total phenols, flavonoids, anthocyanins, and tocopherols, and the antioxidant capacity of the extracts was determined. The results showed that the ethanolic extract of Romanian wild mushroomB. edulisrepresents a natural source of functional compounds.

scholarly journals Effect of different drying methods on the composition of steviol glycosides in Stevia rebaudiana Bertoni leaves

2017 ◽  
Vol 31 (1) ◽  
pp. 139-144
Author(s):  
Irma Aranda-González ◽  
David Betancur-Ancona ◽  
Luis Chel-Guerrero ◽  
Yolanda Moguel-Ordóñez
Keyword(s):  
Low Cost ◽  
Stevia Rebaudiana ◽  
Hplc Method ◽  
Drying Methods ◽  
Steviol Glycosides ◽  
Rebaudioside A ◽  
Drying Method ◽  
Sun Drying ◽  
Stevia Rebaudiana Bertoni ◽  
Rebaudioside D

Abstract Drying techniques can modify the composition of certain plant compounds. Therefore, the aim of the study was to assess the effect of different drying methods on steviol glycosides in Stevia rebaudiana Bertoni leaves. Four different drying methods were applied to Stevia rebaudiana Bertoni leaves, which were then subjected to aqueous extraction. Radiation or convection drying was performed in stoves at 60°C, whereas shade or sun drying methods were applied at 29.7°C and 70% of relative humidity. Stevioside, rebaudioside A, rebaudioside B, rebaudioside C, rebaudioside D, dulcoside A, and steviolbioside were quantified by a validated HPLC method. Among steviol glycosides, the content (g 100 g−1 dry basis) of stevioside, rebaudioside A, rebaudioside B, and rebaudioside C varied according to the drying method. The total glycoside content was higher in sun-dried samples, with no significant differences compared to shade or convection drying, whereas radiation drying adversely affected the content of rebaudioside A and rebaudioside C (p <0.01) and was therefore a method lowering total glycoside content. The effect of the different drying methods was also reflected in the proportion of the sweetener profile. Convection drying could be suitable for modern food processing industries while shadow or sun drying may be a low-cost alternative for farmers.

Resazurin Method for Evaluation of Bioactive Compounds from Cranberry Extracts Using the Metabolic Activity of a ΔSOD1 Mutant of Saccharomyces cerevisiae Yeast Under Severe Osmotic Stress

2020 ◽  
Vol 103 (2) ◽  
pp. 422-427
Author(s):  
Agata Święciło ◽  
Kamila Rybczyńska-Tkaczyk
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Growth Parameters ◽  
Raw Materials ◽  
Antioxidant Properties ◽  
Biological Properties ◽  
Biologically Active ◽  
Antioxidant Compounds ◽  
Alcohol Water

Abstract Background: In addition to nutrients, plant raw materials for food production should also contain substances with beneficial biological properties, which unquestionably include antioxidant compounds. Among the numerous methods of determining the antioxidant properties of samples of plant material, biological methods that provide information about not only the in vivo antioxidant potential of samples but also their metabolism and bioavailability are increasingly valued. Objective: The aim of the study was to assess the antioxidant properties of extracts from large cranberry (Vaccinium macrocarpon) obtained from different producers. Methods: Biologically active compounds were extracted from cranberry fruits using water alone and ethyl alcohol–water in proportions of 1+1 and 4+1 (v/v) as solvents. The following were determined in the extracts: content of phenolic compounds and anthocyanins, total antioxidant capacity based on reduction of the ABTS+• [2,20-azino-bis (3-ethylbenzothiazoline-6-sulphonic acid)] radical cation, and antioxidant properties as reflected by the growth of a Saccharomyces cerevisiae Δsod1 mutant in a liquid hypertonic environment. The growth parameters of this Δsod1 mutant, monitored by a method exploiting a color reaction with resazurin, reflected the antioxidant properties of the extracts. Results: The ethanol–water cranberry extracts showed higher content of polyphenols, anthocyanins, and total antioxidants expressed as Trolox equivalent, determined on the basis of ABTS+• reduction. Conclusions: The antioxidant properties determined by the bioassay did not respond strongly to the data obtained in the in vitro chemical and biochemical assays, because they were more closely associated with the batch of fruit than with the type of solvent used to extract phytochemicals.

scholarly journals Focusing on the Chemical Characterization, Antioxidant and Cytotoxic Properties of Two Geophytes: Crocus Pallasii and Cyclamen Cilicium

Proceedings ◽  
2019 ◽  
Vol 40 (1) ◽  
pp. 17
Author(s):  
Gokhan Zengin ◽  
Evren Yildiztugay
Keyword(s):  
Antioxidant Properties ◽  
Radical Scavenging ◽  
Chemical Characterization ◽  
Biological Properties ◽  
Breast Cancer Cell Lines ◽  
Root Extract ◽  
Methanolic Extracts ◽  
Interesting Candidate ◽  
Trolox Equivalent ◽  
Cancer Agent

Species of the Crocus and Cyclamen genus have been reported to possess diverse biological properties. In the current work, the antioxidant and cytotoxic effects of the methanolic extracts of C. pallasii and C. cilicium aerial and underground parts were evaluated. The flower extracts of C. pallasii and C. cilicium possessed highest flavonoid content. Highest phenolic content was recorded from C. cilicium root extract (47.62 mg gallic acid equivalent/g extract). C. cilicium root extract showed significantly (p < 0.05) high radical scavenging (94.28 and 139.60 mg trolox equivalent [TE]/g extract, against DPPH and ABTS radicals, respectively) and reducing potential (173.30 and 109.53 mg TE/g extract, against CUPRAC and FRAP, respectively). Methanolic extracts of C. pallasii and C. cilicium showed toxicity against breast cancer cell lines. In the light of the above findings, C. cilicium might be considered as an interesting candidate in the development of anti-cancer agent, possessing antioxidant properties.

Sign in / Sign up

Export Citation Format

Share Document