Onion skin waste as a valorization resource for the by-products quercetin and biosugar

Choi, In Seong; Cho, Eun Jin; Moon, Jae‐Hak; Bae, Hyeun‐Jong

doi:10.1016/j.foodchem.2015.05.028

Cited by 121 publications

(57 citation statements)

References 32 publications

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“…In the future, the minimum quality of plant foods could be deined on the base of their content of bioactive components [130]. One of the projects that have been awarded over the years is given below as an example of the fruit and vegetables research community [131] to generate successful applications in the calls published by the EU Commission: FLAVO is the project for "lavonoids in fruits and vegetables: their impact on food quality, nutrition and human health."…”

Section: Future Challenges For Plant Scientists and Growersmentioning

confidence: 99%

Onions: A Source of Flavonoids

Rodrigues¹,

Almeida²,

Simal‐Gándara³

et al. 2017

Flavonoids - From Biosynthesis to Human Health

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Flavonoids are a large and diverse group of polyphenolic compounds with antioxidant efects, and onion (Allium cepa L.) is one of the richest sources of dietary lavonoids. Flavonoid content is afected by endogenous factors-genotype and agro-environmental conditions. Considerable research has been directed toward understanding the nature of polyphenols in diferent products and the factors inluencing their accumulation. This review examines the impacts of pre-and postharvest factors on onions' lavonoid content, highlighting how this knowledge may be used to modulate their composition and the potential use of onion by-products.

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Section: Future Challenges For Plant Scientists and Growersmentioning

confidence: 99%

Onions: A Source of Flavonoids

Rodrigues¹,

Almeida²,

Simal‐Gándara³

et al. 2017

Flavonoids - From Biosynthesis to Human Health

View full text Add to dashboard Cite

show abstract

“…Consequently, they increase cell wall permeability and thus, higher extraction yields of bioactive compounds are achieved [10] . [11] lignans flax 0.407 [12] anthocyanins saffron 0.67 [13] pectinase pectin hydrolase, pectin lyase, pectin esterase sugar grapefruit peel 0.638 [14] starch cassara 45.6 [15] quercetin onion 75 [16] hemicellulase mannanase, xylanase colourant pitaya 83.5 [17] The breakdown of cell walls by enzyme The breakdown of cell walls is the critical step of extraction for many bioactive compounds existing inside of cell walls. Enzyme assisted extraction is based on the ability of enzymes to hydrolyze cell wall components and disrupt the structural integrity of the plant cell wall (As was shown in Fig.1.…”

Section: The Types and Characteristics Of Enzymementioning

confidence: 99%

Advances in Enzyme Assisted Extraction of Natural Products

Cheng¹,

Bi²,

Zhao³

et al. 2015

Proceedings of the 3rd International Conference on Material, Mechanical and Manufacturing Engineering

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“…During the processing of shallots, the outer dried leaves are removed. Shallot skin is a source of phenolic compounds, which has a high content of quercetin and strong antioxidant (Choi et al, 2015). Since the shallot/ onions and their skins are a good source of various bioactive compounds, extraction procedures of quercetin and its glycosides from these plant materials were intensively developed and optimized (Jang et al, 2013;Katsampa et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Identification and extraction method of quercetin from flesh and skin of shallot (Allium ascalonicum) cultivated in Soc Trang province, Vietnam

Thủy¹,

Thủy²,

Cuong³

et al. 2019

Food Res.

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Quercetin is a bioactive compound that has many beneficial effects on human health. Due to a lack of information about quercetin and quercetin derivatives in the Vietnam shallot, this work aimed to identify the quercetin family in shallot skin and flesh by liquid chromatography-mass spectrometry. Effect of extraction method (conventional solvent extraction and ultrasound-assisted extraction), including ethanol concentration (40–80%) and extraction time (15 to 60 mins) on the yield of quercetin were also investigated in this study. Quercetin, quercetin-glucoside and methylated-quercetin-hexose were commonly found in the extract of shallot flesh and skin. A very small amount of quercetin aglycone (0.7%) was found in flesh extract, while it was the most abundant in the skin sample (46.3%). The high content of quercetin-mono-glycoside was obtained in shallot extract (43.8% and 35.3% in the shallot flesh and skin, respectively). The flesh extract also contained high level of quercetin-di-glucoside (38.9%). About 14-16% of methylatedquercetin (-glucoside) were found in shallot bulb (both skin and flesh). It was found that ethanol concentration and extraction time directly affected on the quercetin extraction yield. The highest quercetin content was obtained in the sample which was extracted in 60% ethanol in combination with ultrasound-assisted extraction for 15 to 45 mins. The ultrasound-assisted extraction method improved quercetin yield by 13.38-15.64% and 49.46-56.88% for shallot skin and flesh compared to conventional solvent extraction. This study proved that ultrasound-assisted extraction could successfully be used for extraction of quercetin from shallot (both skin and flesh).

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Onion skin waste as a valorization resource for the by-products quercetin and biosugar

Cited by 121 publications

References 32 publications

Onions: A Source of Flavonoids

Onions: A Source of Flavonoids

Advances in Enzyme Assisted Extraction of Natural Products

Identification and extraction method of quercetin from flesh and skin of shallot (Allium ascalonicum) cultivated in Soc Trang province, Vietnam

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