硫酸香茅醛显色法测定莪术油微囊载药量与包封率     

吴继龙 《特产研究》2014,(1):44-48

为评价莪术油/(麦芽糊精-Povacoat)微囊的质量,建立了硫酸香茅醛显色测定其载药量和包封率的方法。对莪术油乙醇溶液进行波长扫描,确定508nm为最大吸收波长,显色稳定性试验表明,反应液在150min内吸光度较稳定。莪术油检测浓度在0.199 2μg/mL~9.960μg/mL范围内线性关系良好(A=0.094 7C-0.001 2,r=0.999 3),微囊的载药量测定和包封率测定的方法回收率分别为99.6%和99.1%。经测定,3批微囊的载药量为51.5mg/g~53.2mg/g,包封率为88.2%~90.7%。  相似文献   

比色法测定菠菜中草酸含量的条件研究   总被引：3，自引：0，他引：3  

段立珍  汪建飞  赵建荣 《安徽农业科学》2007,35(3):632-633,643

对水杨酸铁络合比色法测定菠菜中草酸含量的条件进行了研究,结果表明,最佳条件是:显色体系pH值2.1～2.7,比色波长510nm,比色时间20 min～2 h.该法测定菠菜样品中草酸含量范围在0～64.0 μg/ml,检出限为1.52 μg/ml;样品加标回收率93.9%～105.2%.  相似文献   

上海地区秋景现状分析及改善途径     

施福成  沈雅玲 《南京农业大学学报》1991,14(3):36-41

上海园林中难见秋色的主要原因是多数秋色叶树种开始变色的临界温度是10℃或更低,故秋色要在11月中下旬才能充分显示,但有几个树种却能在15℃左右即开始变色,还有约15种能在秋季结出美丽的果实,如能成片种植,不仅能使秋色期提前到10月中旬,并能提高上海的秋景水平。  相似文献   

利用染色分析法确定农田土壤中硝态氮垂直运移的研究   总被引：1，自引：3，他引：1  

陈效民  吴华山  沃飞 《水土保持学报》2007,21(5):21-24

利用农田土壤剖面染色并结合田间硝态氮示踪的方法,研究了太湖地区典型的水稻土—白土剖面中优势流和硝态氮在土壤剖面中的运移规律。结果表明:染色法可以分析土壤剖面中大孔隙的分布状况和优势流的路径;染色面积越大的土层,表明该土层的大孔隙含量就越高。在白土剖面上,表层的大孔隙含量最高,20~30 cm和55~100 cm土层以下大孔隙含量都很低。在田间条件下,优势流是影响硝态氮迁移的主要因素;白土剖面中优势流直接影响的最大深度为78 cm,对地下水的影响很大。本试验中地下水的硝态氮含量比未试验前增加了10多倍,这对环境安全影响极大。  相似文献   

红掌佛焰苞中花色素与颜色形成的关系     

杨澜  李崇晖  黄素荣  陈金花  王存  尹俊梅 《北方园艺》2012,(15):68-73

利用切片观察法、显色法和比色法对佛焰苞中花色素的分布情况、组分及含量进行了初步分析。结果表明:红掌佛焰苞中主要含有类黄酮(包括花青素苷、黄酮和黄酮醇)、叶绿素和类胡萝卜素3类色素。大部分品种中类黄酮主要分布于上下表皮细胞中,‘萨维尔’等少数品种的栅栏组织中也有类黄酮分布;而叶绿素和类胡萝卜素则分布在栅栏组织中。各色系均含有类黄酮,红色系比其它色系含有更多的花青素苷,绿色系则含有叶绿素;参试品种中只有棕红色品种‘热带之夜’含有少量类胡萝卜素。花青素苷和叶绿素是佛焰苞显色的主要因素,总体上总花青素苷和叶绿素含量与颜色明度L*呈负相关,而与彩度C*呈正相关,即随着总花青素苷含量的增加,红色和粉红色佛焰苞的红色色调加强,叶绿素含量增加可使绿色和白色佛焰苞的绿色和黄色色调加强。  相似文献   

藤稔葡萄主枝环剥对果实着色及相关基因表达的影响   总被引：2，自引：0，他引：2  

沈伟  杨洪强  李强  冉昆  姜倩倩  孙晓莉  张玮玮  隋静 《园艺学报》2012,39(3):409-414

 对藤稔葡萄主枝环剥促进其果实着色的效果以及对花青苷合成相关重要基因的表达等进行了分析。研究结果表明,主枝环剥不仅可提高果肉中可溶性固形物的含量,并且明显改善果实着色,使外观颜色加深,果皮花青苷含量增加,果面光泽明亮度（L*值）和颜色组分b*值下降,颜色组分a*值以及红色葡萄果实颜色指数（CIRG值）增大。环剥处理还明显促进了UFGT、MYBA1和MYBA2的表达,MYBA1和MYBA2于环剥处理后的第2周（花后63 d）表达水平明显上调,相对表达量达到最高值。UFGT的表达水平与花青苷的积累趋势具有很好的一致性,环剥处理使UFGT的相对表达高峰提前1周左右。  相似文献   

Analysis of petal anthocyanins to investigate coloration mechanism in herbaceous peony cultivars   总被引：1，自引：0，他引：1  

Ni Jia  Qing-Yan Shu  Liang-Sheng Wang  Hui Du  Yan-Jun Xu  Zheng-An Liu 《Scientia Horticulturae》2008

Petal coloration and anthocyanin compositions of 41 herbaceous peony cultivars were analyzed. Anthocyanins were identified by high-performance liquid chromatography–electrospray ionization-mass spectrometry (HPLC–ESI-MSⁿ) coupled with photodiode array detection (DAD). Peonidin-3,5-di-O-glucoside (Pn3G5G), pelargonidin-3,5-di-O-glucoside (Pg3G5G), cyanidin-3,5-di-O-glucoside (Cy3G5G), peonidin-3-O-glucoside (Pn3G), and cyanidin-3-O-glucoside (Cy3G) were the five major anthocyanins in herbaceous peony cultivars. Deep purple or reddish purple cultivars contained 4–5 anthocyanins, whereas pink cultivars only contained Cy3G5G and Pn3G5G, and their contents were much lower than those of purple cultivars. According to the chemical structures of three anthocyanidins in association with petal coloration, flowers were classified into three phenotypes: 1. “Pn, Cy, and Pg” (all purple flowers including two pink flowers); 2. “Pn, Cy” (pink flowers); 3 “Pn” (light pink and white flowers). The coloration mechanisms of cultivars with the pink and purple flowers were quite different. Correlations between lightness (L*) and chroma (C*), chromatic component a* and total anthocyanins (TA) value, a* and co-pigmentation index (CI) showed opposite tendencies, whereas L* and TA showed the same tendency in each group. High contents of Pn3G5G and Pg3G5G may responsible for the purple coloration of herbaceous peony cultivars.  相似文献   

Effects of dietary supplementation of Haematococcus pluvialis powder on gonadal development,coloration and antioxidant capacity of adult male Chinese mitten crab (Eriocheir sinensis)          下载免费PDF全文

Xugan Wu  Lei Zhao  Xiaowen Long  Jianguo Liu  Fang Su  Yongxu Cheng 《Aquaculture Research》2017,48(10):5214-5223

The green algae Haematococcus pluvialis is an important source of natural astaxanthin as feed additive. This study was conducted to investigate the effects of dietary supplementation of H. pluvialis powder on gonadal development, coloration and antioxidant capacity of adult male Chinese mitten crab Eriocheir sinensis, and four experimental diets were formulated to contain 0, 0.2%, 0.4% and 0.6% of H. pluvialis powder. There were four treatments (defined as D1~D4) in this study and each treatment had three replicates. Dietary H. pluvialis contents had no significant effects on survival, body weight gain rate and gonadal development of male E. sinensis. For colour parameters, the total carotenoids content in carapace and hepatopancreas as well as hepatopancreatic lightness (L*) and carapace redness (a*) increased significantly with increasing dietary H. pluvialis (p < 0.05). For the antioxidant indices in the serum, D4 had the lowest activities of superoxide dismutase (SOD) and peroxidase (POD), but the highest glutathione peroxidase (GSH‐Px) and lactic dehydrogenase (LDH), while the malondialdehyde (MDA) in serum and hepatopancreas decreased significantly with the rising content of dietary H. pluvialis (p < 0.05); D1 had the highest levels of SOD, POD and GSH‐Px in hepatopancreas. For the non‐specific immune indices, the highest activities of acid phosphatase (ACP) and γ‐glutamyl transpeptidase (γ‐GT) were found on the serum of D3 and D4 (p < 0.05). D1 had the highest levels of ACP and alkaline phosphatase (ALP) in hepatopancreas, while D2 and D3 had the lowest levels of ALP and ACP respectively. These results suggested the optimal dietary natural astaxanthin level was around 40 mg/kg diets.  相似文献   

鱼类类胡萝卜素着色研究进展     

李铁梁  徐冠玲  邢薇  马志宏  姜娜  罗琳 《上海海洋大学学报》2018,27(2):206-212

类胡萝卜素(carotenoid)是影响鱼类体色特性的主要色素,但鱼类自身不能合成这一色素,因此必须从食物中摄入。鱼类类胡萝卜素着色过程涉及对类胡萝卜素的代谢与沉积过程,色素细胞的分化和空间排列,以及与其他色素和色素细胞间的相互作用,这一过程非常复杂,但我们对其机理知之甚少。综述了类胡萝卜素着色效果与鱼类遗传特性、生理状态以及环境因素之间的相关关系,对该研究领域发展趋势进行了讨论和展望,期望为我国研究鱼类体色的形成机制提供一些新的信息。  相似文献   

槭树叶呈色机理研究进展   总被引：1，自引：0，他引：1  

郁敏  张亚辉 《世界林业研究》2016,29(3):30-34

槭树绚丽多姿、观赏价值高、生态适应性强,可用作庭院树、行道树或景观林树种,在美化城市中发挥着重要作用。文中综述和探讨了槭树叶呈色的生理机理、生态影响因子、花青苷及其合成相关酶在分子生物学方面的研究进展,提出了槭属彩叶植物今后的研究方向,以期为槭树秋色叶变色机理深入研究、叶色改良、新品种育种及其栽培技术提高和园林应用提供参考。  相似文献