scholarly journals Enhanced Yield of Bioactivities from Onion (Allium cepa L.) Skin and Their Antioxidant and Anti-α-Amylase Activities

2020 ◽  
Vol 21 (8) ◽  
pp. 2909 ◽  
Author(s):  
Mariana Gois Ruivo da Silva ◽  
Mihaela Skrt ◽  
Draženka Komes ◽  
Nataša Poklar Ulrih ◽  
Lea Pogačnik
Keyword(s):  
Antioxidant Capacity ◽  
Allium Cepa ◽  
Radical Scavenging ◽  
Value Added ◽  
Ecological Impacts ◽  
Skin Extract ◽  
Operational Parameters ◽  
Liquid Ratio ◽  
Onion Skin ◽  
Allium Cepa L

There is increasing concern for reduction of the ecological impacts of industrial waste caused by fruits and vegetables. To reduce costs of onion waste disposal while obtaining value-added products, onion skin can be used to extract quercetin, a natural flavonoid with antioxidant, anti-inflammatory and anti-cancer effects. The aim was to optimize quercetin extraction from brown onion (Allium cepa L.) skin through investigation of the effects of different parameters on quercetin yield. Operational parameters for conventional maceration extraction and for ultrasound-assisted extraction were compared: solvent type, mass-to-liquid ratio, extraction time and temperature. Antioxidant capacity was determined using DPPH· radical scavenging assays and quercetin yield using HPLC/DAD. Anti-α-amylase activity of onion skin extracts was investigated using α-amylase inhibition assays. Optimal extraction conditions of quercetin from onion skin were obtained with maceration extraction, 50% ethanol, 1:100 mass-to-liquid ratio, 25 °C, for 15 min. Under these conditions, the antioxidant capacity (expressed as quercetin equivalents) was 18.7 mg/g and the mass fraction of quercetin was 7.96 mg/g. The onion skin extracts showed a dose-dependent relationship between dry extract concentration and α-amylase inhibition, which confirms that this onion skin extract can be considered as an anti-diabetes agent.

Ultrasonic _assisted extraction of phenolic compounds with evaluation of red onion skin (Allium cepa L.) antioxidant capacity

2021 ◽  
pp. 1-17
Author(s):  
Vanessa Bordin Viera ◽  
Natiéli Piovesan ◽  
Renius De Oliveira Mello ◽  
Juliano Smanioto Barin ◽  
Aline De Oliveira Fogaça ◽  
...  
Keyword(s):  
Phenolic Compounds ◽  
Antioxidant Capacity ◽  
Allium Cepa ◽  
Onion Skin ◽  
Allium Cepa L

Determination of antioxidant capacity and flavonoid composition of onion (Allium cepa L.) landrace ‘Krishnapuram’ bulb using HPLC-ESI-ITMS

2021 ◽  
Vol 46 (3) ◽  
Author(s):  
G Vijayalakshmi ◽  
M Muni Raja ◽  
M Lakshmipathi Naik ◽  
V Carbone ◽  
G L Russo ◽  
...  
Keyword(s):  
Antioxidant Capacity ◽  
Allium Cepa ◽  
Allium Cepa L ◽  
Flavonoid Composition

scholarly journals Antioxidant Power on Dermal Cells by Textiles Dyed with an Onion (Allium cepa L.) Skin Extract

Antioxidants ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 1655
Author(s):  
Claudia Volpi ◽  
Desirée Bartolini ◽  
Virginia Brighenti ◽  
Francesco Galli ◽  
Matteo Tiecco ◽  
...  
Keyword(s):  
Allium Cepa ◽  
Skin Diseases ◽  
Visible Spectral Range ◽  
Dermal Fibroblasts ◽  
Skin Extract ◽  
Antioxidant Power ◽  
Allium Cepa L ◽  
Artificial Sweat ◽  
Cellular Reactive Oxygen Species ◽  
Dermal Cells

In this study, the phenol loading and antioxidant activity of wool yarn prepared with the aqueous extract of onion (Allium cepa L.) skin was enhanced by implementing the dyeing process with the use of alum as a mordant. Spectrophotometric and chromatographic methods were applied for the characterization of polyphenolic substances loaded on the wool yarn. The antioxidant/anti-inflammatory properties were evaluated by determining the level of intra- and extra-cellular reactive oxygen species (ROS) production in keratinocytes and dermal fibroblasts pre-treated with lipopolysaccharide put in contact with artificial sweat. An elevated dye uptake on wool was observed for the pre-mordanted sample, as demonstrated by high absorbance values in the UV-Visible spectral range. Chromatographic results showed that protocatechuic acid and its glucoside were the main phenolic acid released in artificial sweat by the wool yarns, while quercetin-4′-glucoside and its aglycone quercetin were more retained. The extract released from the textile immersed in artificial sweat showed a significant reducing effect on the intra-and extracellular ROS levels in the two cell lines considered. Cytofluorimetric analyses demonstrated that the selected mordant was safe at the concentration used in the dyeing procedure. Therefore, alum pre-mordanted textiles dyed with onion-skin extracts may represent an interesting tool against skin diseases.

scholarly journals Accumulation of silver nanoparticles and its effect on the antioxidant capacity in Allium cepa L.

Phyton ◽  
2013 ◽  
Vol 82 (1) ◽  
pp. 91-97
Author(s):  
Ju醨ez-Maldonado A ◽  
JL Rosales-Vel醶quez ◽  
H Ortega-Ortiz ◽  
M Cabrera-De-la-Fuente ◽  
H Ram韗ez ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Antioxidant Capacity ◽  
Allium Cepa ◽  
Allium Cepa L

scholarly journals The Staining Interactions of Aqueous Extract of Skin Allium cepa (Red Onion) on Some Selected Histological Tissues

2020 ◽  
pp. 55-64
Author(s):  
M. O. Mohammed ◽  
A. A. Hali ◽  
O. O. Okechi ◽  
A. T. Muhammad ◽  
R. I. Tsamiya ◽  
...  
Keyword(s):  
Allium Cepa ◽  
Ferric Chloride ◽  
Research Work ◽  
Ethanolic Extract ◽  
Wistar Rat ◽  
Skin Extract ◽  
Synthetic Dyes ◽  
Onion Skin ◽  
Group B ◽  
Liver Tissues

Introduction: Histological stains are biological dyes which colour tissue in order to aid optical differentiation of tissue component. Dyes are coloured substance which impact colour for material such as textile, cosmetic, food, drugs, rubber plastics, hair, fur and tissues. There are two types of dyes namely; natural dyes and synthetic dyes. Allium cepa is an imperative, evergreen plant, which belongs to the family Amaryllidaceace commonly called bulb onion. Aim: This research work aimed at evaluating the staining capability of onion extract as counter stain when haematoxylin was used as primary stain. Methods: Tissue blocks sections of liver and kidney organs were made from the Wistar rat. Serial sections labelled A to M were made from each block and stained with Harris haematoxylin. Section A was counterstained with eosin, as control. Different preparations of extracts of the onion skin were used to counter stain sections of kidney and liver tissues. Group B to Mwere kidney and liver tissues stained as follows: B, E, H and K (5% aqueous and ethanolic extract with ferric chloride, 5% aqueous and ethanolic extract with potassium aluminium alum, and 5% aqueous and ethanolic extract without mordant, for 10 and 20 minutes). C, D, F, G, I, J, L and M (5% aqueous and ethanolic extract with ferric chloride, 5% aqueous and ethanolic extract with potassium aluminium alum and 5% aqueous and ethanolic extract without mordant for 10 and 20 minutes). Results: The skin extract of Allium cepa stained the cytoplasm of cells and connective tissues in shades of reddish brown to yellowish brown. The study established the cytoplasmic counter-staining ability of the extract of Allium cepa. Conclusion: It is therefore suggested that onion skin extract solution can be substituted for eosin due to its domestic availability, ease of preparation and above all, its good cytoplasm contrast with the nuclear stain.

scholarly journals Antioxidant potential and α-glucosidase inhibitory activity of onion (Allium cepa L.) peel and bulb extracts

2023 ◽  
Vol 83 ◽  
Author(s):  
S. Masood ◽  
A. ur Rehman ◽  
M. A. Ihsan ◽  
K. Shahzad ◽  
M. Sabir ◽  
...  
Keyword(s):  
Allium Cepa ◽  
Phenolic Content ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Ethanolic Extract ◽  
Antioxidant Potential ◽  
Onion Bulb ◽  
Onion Peel ◽  
Allium Cepa L ◽  
Food Applications

Abstract Allium cepa L. is a commonly consumed vegetable that belongs to the Amaryllidaceae family and contains nutrients and antioxidants in ample amounts. In spite of the valuable food applications of onion bulb, its peel and outer fleshy layers are generally regarded as waste and exploration of their nutritional and therapeutic potential is still in progress with a very slow progression rate. The present study was designed with the purpose of doing a comparative analysis of the antioxidant potential of two parts of Allium cepa, i.g., bulb (edible part) and outer fleshy layers and dry peels (inedible part). Moreover, the inhibitory effect of the onion bulb and peel extracts on rat intestinal α-glucosidase and pancreatic α-amylase of porcine was also evaluated. The antioxidant potential of onion peel and bulb extracts were evaluated using 2,2-diphenyl- 1-picryl hydrazyl (DPPH), ferric-reducing antioxidant power assay (FRAP), 2,2’-azino-bis- 3-ethylbenzothiazoline-6-sulfonic acid (ABTS) radical scavenging assay, H2O2 radical scavenging activity and Fe2+ chelating activity. Total flavonoids and phenolic content of ethanolic extract of onion peel were significantly greater as compared to that of onion bulb. Ethanolic extract of onion peel also presented better antioxidant and free-radical scavenging activity as compared to the ethanolic extract of bulb, while the aqueous extract of bulb presented weakest antioxidative potential. Onion peel extract’s α-glucosidase inhibition potential was also correlated with their phenolic and flavonoid contents. The current findings presented onion peel as a possible source of antioxidative agents and phenolic compounds that might be beneficial against development of various common chronic diseases that might have an association with oxidative stress. Besides, outer dry layers and fleshy peels of onion exhibited higher phenolic content and antioxidant activities, compared to the inner bulb. The information obtained by the present study can be useful in promoting the use of vegetable parts other than the edible mesocarp for several future food applications, rather than these being wasted.

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