Table 1.

Samples of antioxidant plant materials and extraction methods used.

Plant Material	Latin Name	Cultivar	Country	Extraction Solution	Abbreviation	Extraction Method	GAE mg mL−1 Extract
Lyophilized Sea buckthorn leaves	Hippophae rhamnoides L.	’Botnia Guldklimp’	Finland	Pressurized hot water	SBTPHWE	Section 2.1	7.0
Lyophilized Bilberry leaves	Vaccinium myrtillus L.	Native stands	Finland	Pressurized hot water	BBPHWE	Section 2.1	11.6
Sea buckthorn leaves and sprouts	Hippophae rhamnoides L.	Mix of ‘Botaņičeskaja Ļubiteļskaja’ and ‘Prozračnaja’	Latvia	80% Ethanol	SBT80	Gornas et al. [12]	13.2
Sea buckthorn leaves and sprouts	Hippophae rhamnoides L.	Mix of ‘Botaņičeskaja Ļubiteļskaja’ and ‘Prozračnaja’	Latvia	H2O	SBTH2O	Modified from Gornas et al. [12]	9.2
Summer savory leaves	Satureja hortensis L.	Seed origin: Hild Samen	Denmark	Non-extracted	SS	Non-extracted	12.0
Sea buckthorn leaves	Hippophae rhamnoides L.	’Finskaja’	Sweden	50% ethanol	SBT	Burri et al. [11]	8.8
Olive Polyphenols-Phenoliv	Olea europaea L.	Phenoliv™	Sweden	50% ethanol	OS	Burri et al. [11]	3.8
Onion skin	Allium cepa L.	’Donna’	Sweden	50% ethanol	OPP	Burri et al. [11]	3.0
Beetroot leaves	Beta vulgaris subsp. vulgaris	’Action’	Sweden	50% ethanol	BR	Burri et al. [11]	1.0
Lyophilized rhubarb root	Rheum rhabarbarum L.	’Victoria’	Estonia	20% ethanol	LRR	Section 2.1	18.1
Lyophilized black currant leaves	Ribes nigrum L.	’Pamjat Vavilova’	Estonia	20% ethanol	LBC	Section 2.1	10.1