The LC_(50) of hexane,benzene,abso-lute ether,methyl alcohol and water extracts from C. longa was 0.7753,0.0993,0.9855,0.7873 and 0.8384g·L~(-1),respectively after 72h treatment with the parallel extracts.
FlosSophorae Immarurus and Flos Carthami. The results showed that the SCE frequencies were enhanced to7. 0±0. 52～15. 76±0. 81 when the concentrations of the water extracts of Radix et Rhizoma Rhei,Flos Sophprae Immaturs and Flos Chrthami were 2. 5, 5. 0, 7. 5 and 10mg/ml respectively.
The capacities of scavenging [DPPH·] and [·OH] of n-butyl alcohel extracts were stronger than chloroform extracts and water extracts, extracts IC50 are 3.1μg/ml and 18.15μg/ml, rutin (IC50=3.58μg/ml and 7.96μg/ml), respectively.
After extraction, the antioxidative activities of 14 brands of fermented tofu from the markets were determined. The antioxidativeactivity units of water extracts from the 14 brands were from 2.03 to 11.93μg α-tocopherol/mg, and those of 50% ethanol extractswere from 0.75 to 4.94μgα-tocopherol/mg.
The water extracts and alcohol extracts from the dry preparation were used to study the bacteriostatic activities on Bacillus subtilis, Escherichia coli, Staphy lococus aureus, Saccharomyces cerevisiae and Penicillium citrinum Thom .
METHODS:Water extracts of Radix Isatidis had fractional precipitation by ethanol of different concentrations. Eight crude polysaccharide parts of IP-Ⅰ、IP-Ⅱ、IP-Ⅲ…IP-Ⅷand four homogeneous polysaccharide parts of IP-Ⅸ、IP-Ⅹ、IP-Ⅵ、IP-Ⅻwere obtained after fractionated by DEAE cellulose ion exchange chromatography and gel chromatography.
The content of amino acids, essential amino acids, theanine,catechins, caffeine, tea polyphenols and water extracts in raw materials were 1424.00 mg/100g, 547.00 mg/100g, 87.15 mg/100g, 27.63 mg/g, 1.30%, 8.18% and 26.94%,respectively;
Applying magnesium fertilizers can also improve tea quality notablely. Compared with the control, the contents of amino acids, caffeine and water extracts were increased for 5.8%, 9.2% and 2.3% respectively.
The allelopathy of the water extract from the upper\|ground part of 6 species on Ambrosia artemisiifolia was studied. The results showed that the water extracts of Nerium indicum cv . Paihua, Pittosporum tobira, Bidens pilosa, Myrica rubra and Ecalyptus robusta had inhibitory effects on the rate of germination, the elongation of radicals and hypocotyls and the height of the seedling.
1. The study on the effects of water extracts from root and shoot of watermelon (Jingxin-No. 1) on seed germination of other vegetables indicated that the extract from root and shoot also had inhabiting effects on seed germination of other vegetables.