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1.
用RP-HPLC法测定人参茎叶皂苷粉中人参皂苷Re含量 总被引：2，自引：0，他引：2
过去对人参茎叶皂苷含量的测定只限于总皂苷的含量测定 ,对单体皂苷含量测定较少。本文用反相HPLC法测定了人参茎叶皂苷粉中人参皂苷Re的含量。色谱柱为Shim -packclc-ODS柱 (0 1 5m× 6 0mm ,,5μm)。流动相为 0 0 5 %磷酸 :乙腈 (4∶1 ) ,检测波长 2 0 3nm ,流速 1 2ml/min ,柱温 38℃。测得人参茎叶皂苷粉中人参皂苷Re含量为1 6 85 %。 相似文献
2.
RP-HPLC测定大豆异黄酮缓释微丸胶囊的含量 总被引：1，自引：0，他引：1
为有效控制大豆异黄酮缓释微丸胶囊的质量,建立其中一种有效成分金雀异黄素含量的测定方法.采用RP-HPLC法测定大豆异黄酮缓释微丸胶囊中金雀异黄素的含量,固定柱:ZOBAX SB-C18(5μm,250 mm×4.6mm);流动相:乙腈-0.1%H3PO4水溶液(40:60);检测波长:262 nm;柱温:35℃;流速:1.0 mL·min-1;进样量5μL,应用外标一点法以峰面积定量.金雀异黄素在20.88～208.8 ng之间线性关系良好,回归方程为Y=4.38X-2.69,R=0.999(n=6),平均回收率为99.97%,RSD为0.87%(n=9).此法操作简便,结果准确可靠,精密度好,可用于大豆异黄酮缓释微丸胶囊中金雀异黄素的含量测定. 相似文献
3.
数量 (与上年同期相比 /% )万美元 (与上年同期相比 /% )丝绸原料 /吨 2 46 3( -17.5 ) 5 776 .8( -5 .2 )羊绒 /吨 76 0 ( -18.0 ) 7191.5 ( 13.1)原棉 /吨 2 6 0 81( -72 .0 ) 3890 .1( -6 0 .9)纱线、纺织品等总计 :382 6 0 5 .2 ( 11.1) 棉纱 /吨 5 2 80 5 ( 15 .3) 16 15 4.0 ( 17.0 ) 亚麻及苎麻纱 /吨 6 6 6 6 ( 2 1.2 ) 2 2 6 8.3( -0 .5 ) 合成纺线 /吨 2 35 43( 14 .3) 5 5 77.6 ( 2 0 .1) 棉花化纤混纺纱线 /吨 86 35 ( 2 8.5 ) 2 2 70 .8( 31.8) 人造纺线 /吨 2 875 ( -2 7.6 ) 85 8.0 ( -2 5 .3)丝绸纺品 /万米 … 相似文献
4.
本实验采用毛细管电泳间接紫外检测技术测定了西湖龙井茶中金属离子的质量浓度.实验研究了电解质组成,如络合剂、pH、间接紫外检测试剂和最佳测试条件.结果表明:最佳实验条件是采用压力进样(30mbar×5s),未涂层石英毛细管柱60um(id)×50cm,运行电压12KV,紫外检测波长21 0nm,柱温25℃,缓冲液为pH=4.82、含有浓度为6.0 mmol/L咪唑的乙酸溶液.在实验条件下6分钟内实现K 、Ca2 、Na 、Mg2 、Zn2 五种五种离子的分离和测定.迁移时间的相对标准偏差(RSD)＜0.5%,峰面积RSD＜5%(n=5),最低检测限依次为0.002mg/L、0.001mg/L、0.001mg/L、0.01mg/L、0.05mg/L.该方法用于茶水中金属离子的含量测定,回收率95.59%-102.93%%,实验得到了满意的结果. 相似文献
5.
(各年度 1～ 1 0月份 ,亿美元 )品名 199819992 0 0 0 市场份额 /%2 0 0 0 /1999/± %合成丝纱 7.6 377.7989.440 5 3.92 1.1棉纱 (纯棉含量>85 % ) 2 .12 5 2 .3442 .985 17.0 2 7.3人造纤维合成纱 1.0 92 1.2 86 1.5 70 9.0 2 2 .1合成单丝 >6 7DEC,1MMCS 0 .6 90 0 .780 0 .6 193.5 -2 0 .6人造丝纱 0 .940 0 .6 6 2 0 .5 6 73.2 -14 .3精梳羊毛纱 0 .446 0 .3840 .4792 .72 4.7棉纱 (纯棉含量<85 % ) 0 .2 910 .342 0 .40 5 2 .3 18.4棉纱 (缝纫式包装但非缝纫线 ) 0 .2 190 .16 90 .16 91.0 0 .5人造长纤维纱 (非缝纫线 ) 0 .1890 .… 相似文献
6.
《人参研究》2018,(6)
建立了高效液相色谱法同时测定鼠曲草中6种黄酮类成分:槲皮素,木犀草素,芹菜素,山奈酚,金丝桃苷,木犀草素-4’-O-β-D-葡萄糖苷含量的方法。样品用80%甲醇超声提取,采用HPLC法检测,色谱柱:Agilent Eclipse XDB C18Column (250×4.6 mm I.D.,5μm);流动相:乙腈-0.1%甲酸梯度洗脱;流速:1.0 mL/min;柱温:30℃;检测波长:360 nm。结果表明,在一定的浓度范围内6种黄酮的浓度与峰面积线性关系良好,相关系数R~2为0. 9997～0. 9999,样品的加样回收率为95. 20%～108. 5%,RSD均≤2. 8%。本方法简便、快捷、精密度高、重现性好,可用于鼠曲草中黄酮类成分的含量测定。研究结果为明确鼠曲草作用的物质基础以及制定质量标准提供很好的依据。 相似文献
7.
2004/05-2005/06年度世界棉花生产与贸易 总被引：1，自引：1，他引：0
据世界棉花咨询委员会 ( ICAC) 2 0 0 5年 4月 1日消息 :2 0 0 4 /0 5年度世界棉花产量达 2 5 90万 t,比上一年度增加 5 2 0万 t,平均每公顷产 72 1 kg(提高79 kg) ,消费量达 2 30 0万 t(增加 1 70万 t) ,年度末世界棉花库存上升至 1 0 70万 t。 2 0 0 4 /0 5年度平均Cotlook A指数大约为每磅 5 3美分 ,比上一年度降低 1 5美分。棉花的低价导致 2 0 0 5 /0 6世界植棉面积将减少 6% ,预计 2 0 0 5 /0 6年度世界棉花产量为2 32 0万 t。受到化纤的价格竞争 ,2 0 0 5年棉花价格的上涨可能减缓 2 0 0 5 /0 6年度工业用棉的增长 ,增长率为 2 .5… 相似文献
8.
年度 1996/ 971997/ 981998/ 991999/ 2 0 0 02 0 0 0 / 0 1(至 9月份 )期初库存 5 6 .787.2 85 .0 85 .0 85 .0总产 412 .2 40 9.730 2 .9370 .5 398.8进口 8.70 .0 8.72 .2 2 .2可供量 479.44 96 .9396 .6 45 7.6 485 .9纺纱厂用量 2 41.92 46 .2 2 2 6 .6 2 2 2 .32 2 2 .3出口 15 0 .416 3.493.7148.2 172 .2需求量 392 .34 11.9311.6 372 .6 394.4期末库存 87.2 85 .0 85 .0 85 .0 91.5库存 /用棉量比率 / % 2 2 .2 2 0 .6 2 7.32 2 .32 3.美国棉花市场近5年数据统计(万吨)@王淑民… 相似文献
9.
据美国棉花理事会统计 ,截至 2 0 0 4年 2月 5日 ,2 0 0 3/0 4年度美国原棉出口 2 35 .0万吨 ( 1 0 79.2万包 )。前十位的国家和地区如下 :国家 美棉进口量 (万吨 )所占份额 (% )中国 74 .936墨西哥 36 .2 15土耳其 2 0 .39印度尼西亚 15 .2 6加拿大 9.5 4韩国 9.34巴基斯坦 7.93泰国 6 .5 3巴西 6 .5 3日本 6 .332003/04年度美国原棉出口流向@刘全义 相似文献
10.
《中国棉花》2001,(8)
美国纺织行业发展势头旺盛 项 目 19992 0 0 0两年相比 / %纱厂各类纤维用量 (万吨 ) 74975 4 1纤维总运输 (亿美元 ) 783 771- 1利润 (亿美元 ) 6 0 3 5 82 - 4税后利润 (亿美元 ) 7(3)不确切销售收入 (% ) : 纺织品 1.1(0 .4) - 纺织机械 6 .2 6 .7 -就业 (年均以 10 0 0计 ) : 纺织行业 5 5 85 43 - 3 纺织机械制造业 1845 3 1845 7 0 计时收入 (美元 ,年均 ) 10 .72 10 .94 2小时开工指数 (以 1982年为 10 0计 ) : 纺织行业 80 .5 78.6 - 2 纺织机械制造业 10 7.2 10 6 .2 - 1生产者价格指数 (以 1982年… 相似文献
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12.
《Journal of Crop Improvement》2013,27(2):81-114
Summary The efficiency of N fertilizers is usually poor; often less than 50% of the applied N is taken up by the crop. This review focuses on various N fertilizers with respect to the significance of different N loss pathways, namely (i) ammonia volatilization, (ii) dinitrogen and nitrogen oxide emissions, and (iii) nitrate leaching. Further, the significance of biological N immobilization, ammonium fixation and, finally, the impact of nitrate vs. ammonium uptake on crop yield are also discussed. The reviewed literature shows that N fertilizers may differ markedly in their susceptibility to losses. There is, however, considerable scope to improve N efficiency of each N source by proper N management practices. 相似文献
13.
Lakshman Lal 《Potato Research》1987,30(2):329-334
Summary The effects of the leaves of five plant species, one from each of the generaAmbrosia, Anemone, Eupatorium, Eucalyptus andLantana, on potato tuber moth were investigated under indigenous storage conditions at the Central Potato Research Station, Shillong
(1800 m above sea level). Their action was compared with that of a biological insecticide (spores ofBacillus thuringiensis), a chemical insecticide (carbaryl), and an untreated control. The data collected after six months storage on tuber damage,
sprout damage and the rotting indicated that the leaves ofLantana aculeata provided most protection to the tubers, reducing damage from over 70% in the check to below 5%, and sprout damage from over
45% to below 3%. Next best wasEucalyptus globulus followed byB. thuringiensis. They may be used on tubers stored for table use or for seed as they had no adverse effect on germination or on the yield
of a subsequent crop. 相似文献
14.
15.
Joseph E. Laferriere Charles W. Weber Edwin A. Kohlhepp 《Plant foods for human nutrition (Dordrecht, Netherlands)》1991,41(3):277-282
Teas of plant origin traditionally consumed by the Mountain Pima of Chihuahua, Mexico, were analyzed for mineral nutritional content. Fe, Cu, Zn, Ca, and Mg composition was determined for native teas made from shoots ofTagetes lucida, T. filifolia, Elytraria imbricata, andHolodiscus dumosus, and from root xylem ofCeanothus depressus andPhaseolus ritensis. Native uses of these teas are also described. 相似文献
16.
M. I. Siri P. Villanueva M. J. Pianzzola L. Franco Fraguas G. Galván M. Acosta F. Ferreira 《Potato Research》2004,47(3-4):127-138
Summary The in vitro antimicrobial activity of extracts from accessions ofSolanum commersonii Dun. collected in the south of Uruguay was investigated against five microorganisms including the pathogenRalstonia solanacearum. A total of 30 extracts corresponding to organic and aqueous extracts were studied. Interestingly, most of the positive results
for growth inhibition were againstR. solanacearum. The extracts were also analyzed for the presence of glycoalkaloids and lectins. Six of the ten aqueous extracts showed lectin
presence and a wide variation in the type and amounts of glycoalkaloids, was found. Results indicate that there is no clear
relationship between the antimicrobial activity against the five microorganisms screened and the presence or amounts of lectins
and glycoalkaloids, traditionally regarded as possible antimicrobial metabolites in theSolanum genus, which indicates the presence of as yet unidentified antimicrobial compounds. 相似文献
17.
Novel food and non-food uses for sorghum and millets 总被引：4，自引：3，他引：4
Sorghum and millets have considerable potential in foods and beverages. As they are gluten-free they are suitable for coeliacs. Sorghum is also a potentially important source of nutraceuticals such antioxidant phenolics and cholesterol-lowering waxes. Cakes, cookies, pasta, a parboiled rice-like product and snack foods have been successfully produced from sorghum and, in some cases, millets. Wheat-free sorghum or millet bread remains the main challenge. Additives such as native and pre-gelatinised starches, hydrocolloids, fat, egg and rye pentosans improve bread quality. However, specific volumes are lower than those for wheat bread or gluten-free breads based on pure starches, and in many cases, breads tend to stale faster. Lager and stout beers with sorghum are brewed commercially. Sorghum's high-starch gelatinisation temperature and low beta-amylase activity remain problems with regard to complete substitution of barley malt with sorghum malt . The role of the sorghum endosperm matrix protein and cell wall components in limiting extract is a research focus. Brewing with millets is still at an experimental stage. Sorghum could be important for bioethanol and other bio-industrial products. Bioethanol research has focused on improving the economics of the process through cultivar selection, method development for low-quality grain and pre-processing to recover valuable by-products. Potential by-products such as the kafirin prolamin proteins and the pericarp wax have potential as bioplastic films and coatings for foods, primarily due to their hydrophobicity. 相似文献
18.
Alejandro Carlos Tozzini María Fernanda Ceriani María Verónica Saladrigas H. Esteban Hopp 《Potato Research》1991,34(3):317-324
Summary Clones derived from thirty-one different accessions (nineteen of Argentine origin) belonging to eightSolanum species were screened for resistance to infection by potato virus X strain cp (PVX cp) by mechanical inoculation of plantlets
that had been micropropagated in vitro. Estimates of PVX multiplication obtained by enzyme linked immunosorbent assay and
slot blot nucleic acid hybridization allowed the identification of resistant clones derived from five accessions belonging
toS. commersonii S. oplocense, S. sparsipilum andS. tuberosum andigena. Resistant genotypes supported PVX concentrations 5 to 15 times smaller than did the susceptible control cultivar Spunta.
Graft inoculation test confirmed the presence of extreme resistance similar to that conferred by the ‘immunity’ gene X1 (also called RXact). 相似文献
19.
Rita Favas Janaína Morone Rosrio Martins Vitor Vasconcelos Graciliana Lopes 《Marine drugs》2022,20(3)
The loss of density and elasticity, the appearance of wrinkles and hyperpigmentation are among the first noticeable signs of skin aging. Beyond UV radiation and oxidative stress, matrix metalloproteinases (MMPs) assume a preponderant role in the process, since their deregulation results in the degradation of most extracellular matrix components. In this survey, four cyanobacteria strains were explored for their capacity to produce secondary metabolites with biotechnological potential for use in anti-aging formulations. Leptolyngbya boryana LEGE 15486 and Cephalothrix lacustris LEGE 15493 from freshwater ecosystems, and Leptolyngbya cf. ectocarpi LEGE 11479 and Nodosilinea nodulosa LEGE 06104 from marine habitats were sequentially extracted with acetone and water, and extracts were analyzed for their toxicity in cell lines with key roles in the skin context (HaCAT, 3T3L1, and hCMEC). The non-toxic extracts were chemically characterized in terms of proteins, carotenoids, phenols, and chlorophyll a, and their anti-aging potential was explored through their ability to scavenge the physiological free radical superoxide anion radical (O2•−), to reduce the activity of the MMPs elastase and hyaluronidase, to inhibit tyrosinase and thus avoid melanin production, and to block UV-B radiation (sun protection factor, SPF). Leptolyngbya species stood out for anti-aging purposes: L. boryana LEGE 15486 presented a remarkable SPF of 19 (at 200 µg/mL), being among the best species regarding O2•− scavenging, (IC50 = 99.50 µg/mL) and also being able to inhibit tyrosinase (IC25 = 784 µg/mL), proving to be promising against UV-induced skin-aging; L. ectocarpi LEGE 11479 was more efficient in inhibiting MMPs (hyaluronidase, IC50 = 863 µg/mL; elastase, IC50 = 391 µg/mL), thus being the choice to retard dermal density loss. Principal component analysis (PCA) of the data allowed the grouping of extracts into three groups, according to their chemical composition; the correlation of carotenoids and chlorophyll a with MMPs activity (p < 0.01), O2•− scavenging with phenolic compounds (p < 0.01), and phycocyanin and allophycocyanin with SPF, pointing to these compounds in particular as responsible for UV-B blockage. This original survey explores, for the first time, the biotechnological potential of these cyanobacteria strains in the field of skin aging, demonstrating the promising, innovative, and multifactorial nature of these microorganisms. 相似文献
20.
Alejandro M. S. Mayer Abimael D. Rodríguez Orazio Taglialatela-Scafati Nobuhiro Fusetani 《Marine drugs》2013,11(7):2510-2573
The peer-reviewed marine pharmacology literature from 2009 to 2011 is presented in this review, following the format used in the 1998–2008 reviews of this series. The pharmacology of structurally-characterized compounds isolated from marine animals, algae, fungi and bacteria is discussed in a comprehensive manner. Antibacterial, antifungal, antiprotozoal, antituberculosis, and antiviral pharmacological activities were reported for 102 marine natural products. Additionally, 60 marine compounds were observed to affect the immune and nervous system as well as possess antidiabetic and anti-inflammatory effects. Finally, 68 marine metabolites were shown to interact with a variety of receptors and molecular targets, and thus will probably contribute to multiple pharmacological classes upon further mechanism of action studies. Marine pharmacology during 2009–2011 remained a global enterprise, with researchers from 35 countries, and the United States, contributing to the preclinical pharmacology of 262 marine compounds which are part of the preclinical pharmaceutical pipeline. Continued pharmacological research with marine natural products will contribute to enhance the marine pharmaceutical clinical pipeline, which in 2013 consisted of 17 marine natural products, analogs or derivatives targeting a limited number of disease categories. 相似文献