{"type": "FeatureCollection", "features": [{"id": "10.1080/10942912.2020.1716796", "type": "Feature", "geometry": null, "properties": {"updated": "2026-09-22T16:17:29Z", "type": "Journal Article", "created": "2020-01-23", "title": "Antioxidant activity, nutritional, and phenolic composition of sweet potato leaves as affected by harvesting period", "description": "In the present study, the nutritional and phenolic composition as well as the antioxidant activity of sweet potato leaves (SPL) harvested in 3 different periods were determined and compared. Furthermore, gray relational analysis was used to compare the comprehensive nutritional value. Results showed SPL HP1 had the highest protein value (30.8 \u00b1 0.4 g/100 g dw), while SPL HP3 had the highest content of vitamin C (104.6 \u00b1 4.9 mg/100 g dw), vitamin E (5.8 \u00b1 0.4 mg/100 g dw), total polyphenol content (9.1 \u00b1 0.3 g/100 g dw), antioxidant activity (DPPH: 7.4 \u00b1 0.1 g VcE/100 g dw; ABTS: 10.6 \u00b1 0.7 g VcE/100 g dw; FRAP: 0.617 \u00b1 0.005 \u00b5mol TroloxE/100 g dw), and comprehensive nutritional value (weighted gray relational grade 0.8336). The individual phenolic composition showed the presence of six caffeoylquinic acids, caffeic acid, and two flavonoids (quercetin and isoquercetin), which were significantly different among different harvest periods. In conclusion, HP3 was an optimal period for harvesting SPL.", "keywords": ["nutritional composition", "antioxidant activity", "Harvest period", "NUTRITIONAL COMPOSITION", "Food processing and manufacture", "HARVEST PERIOD", "Phenolic composition", "0404 agricultural biotechnology", "Antioxidant activity", "TX341-641", "https://purl.org/becyt/ford/2", "Sweet potato leaves", "2. Zero hunger", "harvest period", "Nutrition. Foods and food supply", "Qu\u00edmica", "04 agricultural and veterinary sciences", "TP368-456", "PHENOLIC COMPOSITION", "sweet potato leaves", "Nutritional composition", "SWEET POTATO LEAVES", "https://purl.org/becyt/ford/2.11", "0405 other agricultural sciences", "ANTIOXIDANT ACTIVITY", "phenolic composition"]}, "links": [{"href": "https://www.tandfonline.com/doi/pdf/10.1080/10942912.2020.1716796"}, {"href": "https://doi.org/10.1080/10942912.2020.1716796"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/International%20Journal%20of%20Food%20Properties", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1080/10942912.2020.1716796", "name": "item", "description": "10.1080/10942912.2020.1716796", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1080/10942912.2020.1716796"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2020-01-01T00:00:00Z"}}], "links": [{"rel": "self", "type": "application/geo+json", "title": "This document as GeoJSON", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=Phenolic+composition&f=json", "hreflang": "en-US"}, {"rel": "alternate", "type": "text/html", "title": "This document as HTML", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=Phenolic+composition&f=html", "hreflang": "en-US"}, {"rel": "collection", "type": "application/json", "title": "Collection URL", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main", "hreflang": "en-US"}, {"type": "application/geo+json", "rel": "first", "title": "items (first)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=Phenolic+composition&", "hreflang": "en-US"}, {"rel": "last", "type": "application/geo+json", "title": "items (last)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=Phenolic+composition&offset=1", "hreflang": "en-US"}], "numberMatched": 1, "numberReturned": 1, "distributedFeatures": [], "timeStamp": "2026-09-23T06:01:44.124563Z"}