In this paper, the kind of remanent small molecules in unsaturated polyester res(?) (UP resin) , the best extractant and the best suitalbe extractive time for measuring the content of these small molecules were studie...In this paper, the kind of remanent small molecules in unsaturated polyester res(?) (UP resin) , the best extractant and the best suitalbe extractive time for measuring the content of these small molecules were studied using ultraviolet- visible spectrophotometry ( UV-VIS method). According to the principle of additivity lightness absorption for mixid solution, the contents of samll molecules in several kinds of cured UP resin were measured. It is pointed out that the UV-VIS method in the assay quality of food grade GRP products is more suitable to China.展开更多
Natural dyes taken from the barks of the tree Caesalpinia sappan has been used in many consumer products.Hence it is imperative to test the toxicity of this dye.In the present study an investigation was conducted to f...Natural dyes taken from the barks of the tree Caesalpinia sappan has been used in many consumer products.Hence it is imperative to test the toxicity of this dye.In the present study an investigation was conducted to find out the toxic effect of aqueous extract of the dye C.sappan in test animal Wister albino rats.Acute oral toxicity showed no clinical signs of toxicity and no mortality even at a dose level of 100–2000 mg/kg in 14 days observation period.When a dose level above 2500 mg/kg was given for 28 days,no death was noticed up to the dose level 5000 mg/kg body weight.The weight of the tested rats was not significantly reduced,when compared with the control group.The organ-body weight ratio of kidney,liver and abdomen did not change when compared to the control group in the observation period.The less toxicity of the dyes of C.sappan.展开更多
文摘In this paper, the kind of remanent small molecules in unsaturated polyester res(?) (UP resin) , the best extractant and the best suitalbe extractive time for measuring the content of these small molecules were studied using ultraviolet- visible spectrophotometry ( UV-VIS method). According to the principle of additivity lightness absorption for mixid solution, the contents of samll molecules in several kinds of cured UP resin were measured. It is pointed out that the UV-VIS method in the assay quality of food grade GRP products is more suitable to China.
文摘Natural dyes taken from the barks of the tree Caesalpinia sappan has been used in many consumer products.Hence it is imperative to test the toxicity of this dye.In the present study an investigation was conducted to find out the toxic effect of aqueous extract of the dye C.sappan in test animal Wister albino rats.Acute oral toxicity showed no clinical signs of toxicity and no mortality even at a dose level of 100–2000 mg/kg in 14 days observation period.When a dose level above 2500 mg/kg was given for 28 days,no death was noticed up to the dose level 5000 mg/kg body weight.The weight of the tested rats was not significantly reduced,when compared with the control group.The organ-body weight ratio of kidney,liver and abdomen did not change when compared to the control group in the observation period.The less toxicity of the dyes of C.sappan.
