Table 1.

α-Glucosidase inhibiting activity (IC₅₀, μg/mL ± S.D.)* and ellagitannin content (ET, mg/g of dry extract weight ± S.D.) for extracts from 85 Rosaceous tea plants.

Species	IC50, μg/mL	ET, mg/g	Group
Agrimonia asiatica	20.29 ± 0.42	63.61 ± 1.59	Active (IC50 < 50 μg/mL)
Geum aleppicum	29.31 ± 0.44	52.03 ± 1.43
Sibbaldianthe bifurca	31.16 ± 0.50	51.45 ± 1.28
Rosa acicularis	32.33 ± 0.54	50.04 ± 1.12
Rubus humulifolius	33.63 ± 0.71	47.05 ± 0.99
Chamaerhodos grandiflora	39.26 ± 0.70	41.94 ± 0.83
Waldstenia ternata	52.18 ± 1.04	32.14 ± 0.64	Medium (IC50 50–100 μg/mL)
Potentilla conferta	54.37 ± 1.02	tr.
Rubus matsumuranus	55.12 ± 1.12	34.16 ± 0.71
Dasiphora fruticosa	55.45 ± 1.27	22.18 ± 0.51
Dryas oxyodonta	58.48 ± 1.28	tr.
Potentilla tergemina	66.71 ± 1.41	6.30 ± 0.12
Agrimonia pilosa	67.82 ± 1.36	34.27 ± 0.82
Dasiphora parvifolia	68.93 ± 1.57	18.45 ± 0.47
Potentilla longifolia	68.86 ± 1.51	tr.
Potentilla stipularis	68.46 ± 1.51	19.57 ± 0.45
Sanguisorba officinalis	77.88 ± 1.75	14.85 ± 0.31
Potentilla fragarioides	79.03 ± 1.58	6.34 ± 0.11
Crataegus sanguinea	84.36 ± 1.94	tr.
Cotoneaster melanocarpus	90.12 ± 2.16	tr.
Potentilla nudicaulis	91.52 ± 2.21	tr.
Sibbaldia procumbens	92.61 ± 2.31	5.22 ± 0.10
Fragaria vesca	95.47 ± 1.90	7.36 ± 0.14
Sanguisorba alpina	96.07 ± 2.49	7.55 ± 0.11
Potentilla tanacetifolia	96.93 ± 2.52	tr.
60 Rosaceous species b	>100	tr.	Low active / inactive (IC50 > 100 μg/mL)

* Acarbose was used as a reference compound (IC₅₀ 1214.25 ± 24.48 μg/mL). ^b Listed in Table S1. tr.—traces (<0.01 mg/g).