Characterization of Different 'Tropea Red Onion' (Allium Cepa L.) Ecotypes by Aroma Precursors, Aroma Profiles and Polyphenolic Composition

Russo, Mt.; Cefaly, V.; Sanzo, Rosa Di; Carabetta, Sonia; Postorino, S.; Serra, Dominique de Rocca

doi:10.17660/actahortic.2012.939.25

Cited by 3 publications

(4 citation statements)

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“…The exhaustive extract of "Ramata di Montoro" onion skin was first fractionated in ethyl acetate and BuOH soluble portions by liquid-liquid partition. Their UHPLC-UV analyses ( Figure S2) indicated that ethyl acetate fraction contains all target compounds (11, 13, 18, 19, 21 and 22), except the diglycoside derivatives of quercetin (6), present in n-BuOH extract and purified from it by preparative reversed-phase HPLC-IR. The ethyl acetate extract was then purified using gel permeation chromatography followed by reversed-phase HPLC-IR.…”

Section: Isolation Of Major Flavonols Of Onion Skinmentioning

confidence: 99%

“…The multilayer tissue of onion bulbs is a rich source of bioactive compounds belonging to two main chemical groups: the alk(en)yl cysteine sulfoxides and flavonoids. The first group of molecules accounts for the characteristic odor and taste of onion, thus their composition and content determine unique flavors in the different species/varieties [ 5 , 6 ]. Regarding color, different colors of skin and bulbs, ranging from red to yellow, are strictly dependent on flavonoid composition, where the yellow color is mostly due to quercetin and derivatives [ 7 ], while red is due to anthocyanins [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

“…The Calabrian variety has a typical red-colored envelope and a unique sweetness, whereas the “Ramata di Montoro” has a coppery skin and a delicate and persisting aroma. [ 8 ] reported flavonoids and sugar content in the bulb and skin of “Rossa di Tropea” onion, underlying the highest flavonol concentration in this local cultivar than other red Italian onions [ 6 ]. Nevertheless, being the high content of anthocyanins concentrated in the inedible outer layer of “Rossa di Tropea” onion, the health promoting potential was not associated with a possible dietary intake.…”

Section: Introductionmentioning

confidence: 99%

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Onion Peel: Turning a Food Waste into a Resource

et al. 2021

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Food waste is a serious problem for food processing industries, especially when it represents a loss of a valuable source of nutrients and phytochemicals. Increasing consumer demand for processed food poses the problem of minimizing waste by conversion into useful products. In this regard, onion (Allium cepa) waste consisting mainly of onion skin is rich in bioactive phenolic compounds. Here, we characterized the flavonoid profiles and biological activities of onion skin wastes of two traditional varieties with protected geographical indication (PGI), the red “Rossa di Tropea” and the coppery “Ramata di Montoro”, typically cultivated in a niche area in southern Italy. The phytochemical profiles of exhaustive extracts, characterized by ultra-high-performance liquid chromatography coupled with ultraviolet (UV) detection and high-resolution mass spectrometry, revealed that flavonols and anthocyanins were the characteristic metabolite classes of onion skins. Quercetin, quercetin glucosides and their dimer and trimer derivatives, and, among anthocyanins, cyanidin 3-glucoside, were the most abundant bioactive compounds. The potential of onion skins was evaluated by testing several biological activities: ABTS/oxygen radical absorbance capacity (ORAC) and in vitro alpha-glucosidase assays were performed to evaluate the antioxidant and anti-diabetic properties of the extracts and of their main compounds, respectively, and proliferative activity was evaluated by MTT assay on human fibroblasts. In the present study, by observing various biological properties of “Rossa di Tropea” and “Ramata di Montoro” onion-dried skins, we clearly indicated that this agricultural waste can provide bioactive molecules for multiple applications, from industrial to nutraceutical and cosmetical sectors.

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Section: Isolation Of Major Flavonols Of Onion Skinmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Onion Peel: Turning a Food Waste into a Resource

et al. 2021

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“…The onion represents a significant crop production in the Calabria region [6]. The success of this product on the national and international markets relies on its unique intrinsic characteristics, such as the organoleptic properties [33] and the presence of nutraceutical compounds that make the Tropea red onion a "functional food" [34,35]. These characteristics allowed obtaining the brand European Protected Geographical Indication "Cipolla Rossa di Tropea Calabria IGP".…”

Section: Study Sitementioning

confidence: 99%

Monitoring Onion Crop “Cipolla Rossa di Tropea Calabria IGP” Growth and Yield Response to Varying Nitrogen Fertilizer Application Rates Using UAV Imagery

Messina

Praticò

Badagliacca

et al. 2021

Drones

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Remote sensing (RS) platforms such as unmanned aerial vehicles (UAVs) represent an essential source of information in precision agriculture (PA) as they are able to provide images on a daily basis and at a very high resolution. In this framework, this study aims to identify the optimal level of nitrogen (N)-based nutrients for improved productivity in an onion field of “Cipolla Rossa di Tropea” (Tropea red onion). Following an experiment that involved the arrangement of nine plots in the onion field in a randomized complete block design (RCBD), with three replications, three different levels of N fertilization were compared: N150 (150 kg N ha−1), N180 (180 kg N ha−1), and e N210 (210 kg N ha−1). The crop cycle was monitored using multispectral (MS) UAV imagery, producing vigor maps and taking into account the yield of data. The soil-adjusted vegetation index (SAVI) was used to monitor the vigor of the crop. In addition, the coverage’s class onion was spatially identified using geographical object-based image classification (GEOBIA), observing differences in SAVI values obtained in plots subjected to differentiated N fertilizer treatment. The information retrieved from the analysis of soil properties (electrical conductivity, ammonium and nitrate nitrogen), yield performance and mean SAVI index data from each field plot showed significant relationships between the different indicators investigated. A higher onion yield was evident in plot N180, in which SAVI values were higher based on the production data.

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