本文采用对氨基苯磺酸-盐酸萘乙二胺分光光度法,研究胡萝卜提取液清除亚硝酸盐的效果。以单因素试验和正交试验为基础,研究浸提温度、浸提液用量和反应温度对亚硝酸盐清除率的影响。正交试验表明,胡萝卜提取液清除亚硝酸盐的最佳条件是...本文采用对氨基苯磺酸-盐酸萘乙二胺分光光度法,研究胡萝卜提取液清除亚硝酸盐的效果。以单因素试验和正交试验为基础,研究浸提温度、浸提液用量和反应温度对亚硝酸盐清除率的影响。正交试验表明,胡萝卜提取液清除亚硝酸盐的最佳条件是提取温度为60℃,提取液用量为12 m L,反应温度为60℃。展开更多
For choosing suitable summer-planting adzuki bean crop, this experiment adopted the method of indoor petri dish bioassay to study the allelopathy effect of adzuki bean, radish, cabbage and wheat under different concen...For choosing suitable summer-planting adzuki bean crop, this experiment adopted the method of indoor petri dish bioassay to study the allelopathy effect of adzuki bean, radish, cabbage and wheat under different concentrations of adzuki bean root aqueous extracts. The result showed that the adzuki bean had a strong inhibition towards its germination rate and germination index. With the increasing concentration of the adzuki bean root aqueous extract, the seed germination rate and germination index of the three kinds of receptor crops presented a decreasing trend. From the root length, spire length, the number of lateral roots, plant height, fresh mass and other morphological indexes of seedlings, it was concluded that with the increase of concentration of adzuki bean root aqueous extract, only wheat pre- sented a promotion effect while the other two kinds of receptor crops showed an inhibition effect, which were not significant at low concentrations. With the increase of concentration of adzuki bean root extracts, the SOD and POD activities of radish and wheat also increased, while the two kinds of enzyme activities of cabbage showed a decreasing trend. The MDA contents in seedlings of radish and wheat decreased, while the MDA content in cabbage increased significantly, which showed that wheat could be used as a rotation crop of adzuki bean, and radish also had a great application potential in adzuki bean crop rotation.展开更多
Based on the solubility in supercritical CO2,two strategies in which CO2 plays different roles are used to make quercetine and astaxanthin particles by supercritical fluid technologies.The experimental results showed ...Based on the solubility in supercritical CO2,two strategies in which CO2 plays different roles are used to make quercetine and astaxanthin particles by supercritical fluid technologies.The experimental results showed that micronized quercetine particles with mean particle size of 1.0-1.5 μm can be made via solution enhanced dispersion by supercritical fluids(SEDS) process,in which CO2 worked as turbulent anti-solvent;while for astaxanthin,micronized particles with mean particle size of 0.3-0.8 μm were also made successfully by rapid expansion supercritical solution(RESS) process.展开更多
Vitamin A deficiency still remains a nutritional concern in Cameroon. Squashes pulp is rich in provitamins A and could help to reduce this deficiency. Unfortunately, in Cameroon, squash pulp is more often reserved for...Vitamin A deficiency still remains a nutritional concern in Cameroon. Squashes pulp is rich in provitamins A and could help to reduce this deficiency. Unfortunately, in Cameroon, squash pulp is more often reserved for the nutrition of sick people and domestic animals. This study aimed at encouraging the consumption of squash pulp to contribute to vitamin A needs. The contents of a-carotene, all-trans-β-carotene and ascorbic acid were determined respectively by HPLC and titration with 2.6 dichlorophenol-indophenol in five landraces of raw, steamed, steam-dried and fried squash pulp from Cameroon. Moisture and total lipid content were also determined. Peeled pulp squash of 5 cm slice was steamed at 90℃ for 30 min or at 85℃ for 30 min, sliced again at 5 mm thickness and dried at 80℃ during 4 h to obtained steamed or steam-dried squashes. To have fried squashes, 40 g of 1 mm thickness slices pulp were fried in boiling refined palm oil （free of carotenoids） bath at 150℃ during 7 and 10 min. The results obtained showed that steam-drying and frying of squashes leaded to water losses （89%-95%）. As a consequence of this, the a-carotene, all-trans-β-carotene and ascorbic acid contents （expressed in g （100 g）-1 fresh portion） of steam-dried and fried squashes were significantly higher （P 〈 0.05） than those of steamed and raw pulp. However, the retention rate of provitamins A and ascorbic acid was more elevated in steamed than in steam-dried and fried squashes. These results suggest that steam-dried and fried squashes could contribute to fight against vitamin A deficiency while increasing availability of squashes.展开更多
Neonicotinoids including IM （Imidacloprid） are widely used as plant systemic insecticides. Several studies have indicated that pesticide toxicity may be associated with the enhanced production of ROS （reactive oxyg...Neonicotinoids including IM （Imidacloprid） are widely used as plant systemic insecticides. Several studies have indicated that pesticide toxicity may be associated with the enhanced production of ROS （reactive oxygen species）. Both β-carotene （I3C） and hesperidin （H） have an antioxidant property and quench free radicals. This study aimed to clarify the protective role of β-carotene and hesperidin as natural antioxidants on IM induced toxicity in hematological parameters and markers of cardiac muscle activity in male albino rats. The treatment of rats with IM showed a significant decrease in hemoglobin （Hb %）, MCH （mean corpuscular hemoglobin）, MCHC （mean corpuscular hemoglobin concentration）, HCT （hematocrit） values and RBCs count comparing with control group. On the other hand, MCV （mean corpuscular volume）, WBCs （white blood cells） and Pits （platelets） count pronounced a significant increase in IM group comparing to control. Also, αFP （plasma alpha fetoprotein）, CEA （carcinoembryonic antigen）, CK （creatine kinase）, CK-MB （creatine phosphokinase myocardial band） and LDH （lactate dehydrogenase） clarify a significant increase in IM group comparing to control. Both β-carotene and hesperidin mitigate the deleterious effects of IM on previous parameters. β-Carotene and hesperidin may protect hematopoietic system and heart muscle against toxicity of IM. These improvements of the results clarify the protective effect of the used antioxidants. Conclusion： β-carotene and hesperidin, natural antioxidants, have a protective effect against IM evoked hematological and biochemical changes.展开更多
基金Supported by Key Science and Technology Program of Shanxi Province(20140311017-7)~~
文摘For choosing suitable summer-planting adzuki bean crop, this experiment adopted the method of indoor petri dish bioassay to study the allelopathy effect of adzuki bean, radish, cabbage and wheat under different concentrations of adzuki bean root aqueous extracts. The result showed that the adzuki bean had a strong inhibition towards its germination rate and germination index. With the increasing concentration of the adzuki bean root aqueous extract, the seed germination rate and germination index of the three kinds of receptor crops presented a decreasing trend. From the root length, spire length, the number of lateral roots, plant height, fresh mass and other morphological indexes of seedlings, it was concluded that with the increase of concentration of adzuki bean root aqueous extract, only wheat pre- sented a promotion effect while the other two kinds of receptor crops showed an inhibition effect, which were not significant at low concentrations. With the increase of concentration of adzuki bean root extracts, the SOD and POD activities of radish and wheat also increased, while the two kinds of enzyme activities of cabbage showed a decreasing trend. The MDA contents in seedlings of radish and wheat decreased, while the MDA content in cabbage increased significantly, which showed that wheat could be used as a rotation crop of adzuki bean, and radish also had a great application potential in adzuki bean crop rotation.
基金Supported partially by the China Ministry of Science and Technology for the China’s Agenda 21 Strategic Research (MOST,2008IM021900)the General Administration of Quality Supervision Inspection and Quarantine of the People’s Republic of China for the 4th Food Safety Research (AQSIQ 2008:ASPAQ0809)
文摘Based on the solubility in supercritical CO2,two strategies in which CO2 plays different roles are used to make quercetine and astaxanthin particles by supercritical fluid technologies.The experimental results showed that micronized quercetine particles with mean particle size of 1.0-1.5 μm can be made via solution enhanced dispersion by supercritical fluids(SEDS) process,in which CO2 worked as turbulent anti-solvent;while for astaxanthin,micronized particles with mean particle size of 0.3-0.8 μm were also made successfully by rapid expansion supercritical solution(RESS) process.
文摘Vitamin A deficiency still remains a nutritional concern in Cameroon. Squashes pulp is rich in provitamins A and could help to reduce this deficiency. Unfortunately, in Cameroon, squash pulp is more often reserved for the nutrition of sick people and domestic animals. This study aimed at encouraging the consumption of squash pulp to contribute to vitamin A needs. The contents of a-carotene, all-trans-β-carotene and ascorbic acid were determined respectively by HPLC and titration with 2.6 dichlorophenol-indophenol in five landraces of raw, steamed, steam-dried and fried squash pulp from Cameroon. Moisture and total lipid content were also determined. Peeled pulp squash of 5 cm slice was steamed at 90℃ for 30 min or at 85℃ for 30 min, sliced again at 5 mm thickness and dried at 80℃ during 4 h to obtained steamed or steam-dried squashes. To have fried squashes, 40 g of 1 mm thickness slices pulp were fried in boiling refined palm oil （free of carotenoids） bath at 150℃ during 7 and 10 min. The results obtained showed that steam-drying and frying of squashes leaded to water losses （89%-95%）. As a consequence of this, the a-carotene, all-trans-β-carotene and ascorbic acid contents （expressed in g （100 g）-1 fresh portion） of steam-dried and fried squashes were significantly higher （P 〈 0.05） than those of steamed and raw pulp. However, the retention rate of provitamins A and ascorbic acid was more elevated in steamed than in steam-dried and fried squashes. These results suggest that steam-dried and fried squashes could contribute to fight against vitamin A deficiency while increasing availability of squashes.
文摘Neonicotinoids including IM （Imidacloprid） are widely used as plant systemic insecticides. Several studies have indicated that pesticide toxicity may be associated with the enhanced production of ROS （reactive oxygen species）. Both β-carotene （I3C） and hesperidin （H） have an antioxidant property and quench free radicals. This study aimed to clarify the protective role of β-carotene and hesperidin as natural antioxidants on IM induced toxicity in hematological parameters and markers of cardiac muscle activity in male albino rats. The treatment of rats with IM showed a significant decrease in hemoglobin （Hb %）, MCH （mean corpuscular hemoglobin）, MCHC （mean corpuscular hemoglobin concentration）, HCT （hematocrit） values and RBCs count comparing with control group. On the other hand, MCV （mean corpuscular volume）, WBCs （white blood cells） and Pits （platelets） count pronounced a significant increase in IM group comparing to control. Also, αFP （plasma alpha fetoprotein）, CEA （carcinoembryonic antigen）, CK （creatine kinase）, CK-MB （creatine phosphokinase myocardial band） and LDH （lactate dehydrogenase） clarify a significant increase in IM group comparing to control. Both β-carotene and hesperidin mitigate the deleterious effects of IM on previous parameters. β-Carotene and hesperidin may protect hematopoietic system and heart muscle against toxicity of IM. These improvements of the results clarify the protective effect of the used antioxidants. Conclusion： β-carotene and hesperidin, natural antioxidants, have a protective effect against IM evoked hematological and biochemical changes.
