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 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.

scholarly journals Phytochemical Characterization and Screening of Antioxidant, Antimicrobial and Antiproliferative Properties of Allium × Cornutum Clementi and Two Varieties of Allium cepa L. Peel Extracts

Plants ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 832
Author(s):  
Željana Fredotović ◽  
Jasna Puizina ◽  
Marija Nazlić ◽  
Ana Maravić ◽  
Ivica Ljubenkov ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Cell Line ◽  
Cancer Cell ◽  
Allium Cepa ◽  
Cancer Cell Line ◽  
Osteosarcoma Cell ◽  
Waste Products ◽  
Antioxidant Power ◽  
Allium Cepa L ◽  
Pharmaceutical Industries

Onions are one of the most widely grown vegetable crops. As production increases, so does the generation of waste from various parts of the onion, raising the need for efficient ecological disposal and use of such waste products. However, onion waste products are a rich source of antioxidants with a range of biological properties, therefore, they could potentially be used in food and pharmaceutical industries. In the present study, we identified the main flavonols and anthocyanins in peel extracts of Allium × cornutum Clement ex Visiani, 1842, and two varieties of Allium cepa L. and tested their antioxidant, antimicrobial and antiproliferative properties. Quercetin 3,4′-diglucolside, quercetin 4′-monoglucoside and quercetin are the most abundant flavonols in all onion extracts detected by high-performance liquid chromatography (HPLC) method. The composition of anthocyanins varied in all extracts. 2,2′-diphenyl-1-picrylhydrazyl (DPPH) and oxygen radical absorbance capacity (ORAC) assays showed that the triploid onion A. × cornutum had the highest antioxidant power. Evaluation of antimicrobial activity by broth microdilution assay also showed that A. × cornutum had higher antimicrobial activity compared to the red and yellow onion varieties. Comparable antiproliferative activity was confirmed for all onion extracts tested on three cancer cell lines: Hela (cervical cancer cell line), HCT116 (human colon cancer cell line) and U2OS (human osteosarcoma cell line). The most abundant onion flavonols (quercetin 3,4′-diglucoside and quercetin 4′-monoglucoside) showed weaker antimicrobial as well as antiproliferative properties compared to the extracts, leading to the conclusion that other phytochemicals besides flavonols contribute to the biological activity of onion peel extracts. The results demonstrate the antioxidant and antimicrobial properties of onion peels, which have promising potential as cancer cell proliferation inhibitors.

Цитогенетические эффекты гамма-излучения в проростках Allium cepa L.

2018 ◽  
Vol 481 (1) ◽  
pp. 99-103
Author(s):  
А.Я. Болсуновский ◽  
Д.В. Дементьев ◽  
Е.М. Иняткина ◽  
Ю.В. Кладько ◽  
М.В. Петриченков ◽  
...  
Keyword(s):  
Allium Cepa ◽  
Allium Cepa L

Biological Activities of Carlina Oxide Isolated from the Roots of Carthamus caeruleus

2020 ◽  
Vol 10 (2) ◽  
pp. 145-152 ◽  
Author(s):  
Imane Rihab Mami ◽  
Rania Belabbes ◽  
Mohammed El Amine Dib ◽  
Boufeldja Tabti ◽  
Jean Costa ◽  
...  
Keyword(s):  
Antifungal Activity ◽  
Essential Oil ◽  
Skin Diseases ◽  
Antioxidant Activities ◽  
Biological Activities ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Penicillium Expansum ◽  
Natural Food ◽  
Antioxidant Power

Background: Carthamus caeruleus belongs to the Asteraceae family. The roots are traditionally used as healing agents. They help to heal burns and treat skin diseases. They are also used against joint inflammation and are very effective against diseases such as irritable bowel syndrome for cancer patients. Objectives: The purpose of this work was i) to study the chemical composition of i) the essential oil and hydrosol extract of Carthamus caeruleus, ii) to isolate the major component of both extracts and iii) to evaluate their antioxidant, antifungal and insecticidal activities. Methods: The essential oil and hydrosol extract obtained from the roots were studied by GC and GC/MS. The antioxidant activities were performed using two different methods i) Radical scavenging activity (DPPH) and ii) the Ferric-Reducing Antioxidant Power (FRAP), using BHT as a positive control. Whereas, the antifungal activity of the essential oil and Carlina oxide was investigated against plant fungi. The fumigation toxicity of C. caeruleus essential oil besides Carlina oxide was evaluated against adults of Bactrocera oleae better known as the olive fly. Results: The essential oil and hydrosol extract were mainly represented by acetylenic compounds such as carline oxide and 13-methoxy carline oxide. Carlina oxide was isolated and identified by 1H and 13C NMR spectroscopic means. The results showed that Carlina oxide presented interesting antioxidant and antifungal properties, while C. caeruleus root essential oil had better insecticidal activity. Furthermore, Carlina oxide has demonstrated promising in vivo antifungal activity to control infection of apples by Penicillium expansum. Conclusion: Carlina oxide can be used as a natural food preservative and alternative to chemical fungicides to protect stored apple against Penicillium expansum.

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