共查询到20条相似文献，搜索用时 187 毫秒
1.
目的 :建立测定益母草中多糖含量的方法。方法 :采用水杨酸法测定还原性单糖的含量和水解后的总糖含量 ,从而间接测出益母草中的多糖含量。结果 :糖浓度 5～ 4 0ug在范围内呈现良好的线性关系 ,益母草中多糖含量为 (31.16± 0 .2 3) % ,平均回收率为 98.92 %。RSD=2 .2 5 %。结论 :该方法简便、快速、准确 ,并且消除了样品中还原性单糖对多糖含量测定的影响 ,该方法特别适合于含有单糖的样品中多糖的含量测定。 相似文献
2.
《赣南师范学院学报》2018,(6):60-64
采用微波消解-氢化物发生原子荧光光谱法测定大蒜中硒的含量,并对测定结果进行不确定度评定.通过标准溶液配制、工作曲线拟合、样品制备过程、样品重复性测定等分量的不确定度评估,得出本方法的不确定度主要来源于样品制备过程和重复性测定.所测定的大蒜粉样品中硒的平均含量为0. 404 mg/kg,扩展不确定度为0. 048 mg/kg(k=2). 相似文献
3.
阮鸣 《南京晓庄学院学报》2013,(3):71-75
该实验通过测定冠心宁注射液中的丹参酚酸类成分和糖类成分,为评价冠心宁注射液的质量品质提供理论依据.采用紫外可见分光光度法检测,进行方法学考察,测定10批冠心宁注射液的丹参酚酸和总糖的含量.结果表明,NaNO2-Al（NO3）3显色法用于测定丹参酚酸的含量;苯酚-硫酸法用于测定总糖的含量;10批冠心宁注射液中丹参酚酸和总糖的平均含量分别为93.27mg.10 ml-1、969.87 mg.10 ml-1,分别占固含物的7.66%、79.60%.因此,该方法简便快速、准确可靠,可有效评价冠心宁注射液中80%以上的大类成分的含量. 相似文献
4.
对辽宁产玉米须中尿囊素的含量进行测定.采用热回流提取法对玉米须中的尿囊素进行提取,高效液相色谱法测定其含量.结果表明,80%乙醇溶液为提取溶剂,按照1∶25的料液比提取2 h,提取效果最好.样品世宾28和吉农大501中尿囊素含量分别为5.195 mg/g和5.240 mg/g. 相似文献
5.
对不同产地海参中总锗的含量进行测定.采用灰化法对样品进行处理,以CTMAB为增溶剂,明胶为稳定剂,苯芴酮为显色剂,在酸性条件下进行显色,利用分光光度法测定海参中锗的含量.该体系在503 nm处有最大吸收峰,回归方程为A=1.092 5 C+0.168 15,线性范围为0.072~0.504μg/mL,r=0.997 8,方法的回收率为98.54%~99.30%,RSD为1.9%.本方法样品处理简单,准确度高,可用于海参中锗的含量测定. 相似文献
6.
《洛阳师范学院学报》2019,(2)
采用超声法提取牡丹皮中的有效成分,用高效液相色谱法测定不同产地、不同炮制方法样品中丹皮酚的含量.结果显示,相同色谱条件下,丹皮酚的平均回收率为97.30%, RSD为1.81%(n=6), 4个不同产地中陕西秦岭的丹皮样品中丹皮酚的总含量最高,而河南洛阳样品中丹皮酚的总含量最低,但各地区丹皮酚的总含量均大于1.2%.不同炮制方法提取的丹皮酚含量的比较:醋泡>生品>盐泡>蜜炒>酒泡>炒炭.结论:不同产地丹皮酚的含量有所差别,且不同炮制方法对提取的丹皮酚的含量也有影响,因此要采用合适的炮制方法,减少药效成分的破坏. 相似文献
7.
用常规方法测定阳荷主要营养成分含量。水分测定用直接干燥法,灰分测定用灰化法,蛋白质测定用分光光度法,粗脂肪测定是索氏提取法,粗纤维测定用酸碱水解法,维生素C测定用滴定法,总糖测定用苯酚硫酸法,总酸测定酸碱滴定法,氨基酸测定用全自动氨基酸分析仪法。结果表明:铜仁市售阳荷水分的含量为86%、灰分的含量为1.2 g/100g、蛋白质的含量为9.8 g/100g、粗脂肪的含量为4.12 g/100g、粗纤维的含量为16.94 g/100g、总糖的含量为2.3 g/100g、维生素C的含量为0.029 g/100g、总酸度为0.26%。用氨基酸分析仪测定出有17种氨基酸,其中必需氨基酸有7种,其总含量为3.469 g/100g,非必需氨基酸总含量为5.603g/100g,总的氨基酸含量为9.072 g/100g,其中谷氨酸含量最高。可知,该地阳荷营养价值丰富,具有一定的开发与利用价值。 相似文献
8.
《河南职业技术师范学院学报(职业教育版)》2017,(1)
采用国家标准方法测定125个玉米样品中的蛋白质、淀粉和脂肪含量,同时测定玉米样品的近红外光谱(NIRS)数据.采用多次、随机选择定标集和校正集样品的方法,对支持向量回归(SVR)模型的参数进行优化,探讨离散小波变换(DWT)对SVR模型的影响.结果表明:DWT可有效去除玉米NIRS数据中的背景和噪声,建立的DWT-SVR多变量回归模型具有较好的稳健性,可实现玉米样品中蛋白质、淀粉和脂肪的同时测定. 相似文献
9.
比较安徽省几种药用菊花总黄酮、总酚、总糖含量。采用紫外-可见分光光度法,以芦丁、没食子酸、葡萄糖为对照品,对菊花中总黄酮、总酚、总糖含量进行测定。结果表明,不同产地、不同栽培类型的菊花几类成分含量有一定差异。 相似文献
10.
以不同浓度的植物生长调节剂(ZLI)处理水稻种子,分别测定其根系活力、淀粉酶活力及可溶性糖的含量。结果表明:不同浓度的ZLI对种子的萌发影响各不相同,当浓度为10-5g/L时,种子的根系活力、淀粉酶活力均明显提高,可溶性糖含量稍有下降。说明ZLI是一个剂量因子,浓度为10-5g/L可以促进种子的萌发。 相似文献
11.
罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
12.
Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献
13.
Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F. 相似文献
14.
邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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16.
陈美曦 《山东教育学院学报》2008,23(2):103-107
Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language. 相似文献
17.
Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
18.
《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
19.
YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 相似文献