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1.
冷原子—无色散原子荧光光谱法测定奶粉中汞的有关问题的探讨 总被引:3,自引:0,他引:3
本文第一次提出汞样品经硝酸消化后,汞(Hg)与氮氧化物(NxOr)形成络合物,在经典的加氯化亚锡(SnCl2)还原时,生成Hg与NO并能同时逸出,确定了Hg与NxOr存在配位关系,对汞的测定在数学计量上增加到1.5倍,结果表明,应用五氧化二矾消化奶样品能如实反映这一关系,并精确地得出其汞含量,在联合国环境规划署和粮食农业及世界卫生组织食品污染联合监测计划的第八届铅,镉,汞的分析质量保证中,应用本法 相似文献
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微波消化-ICP-MS法测定尿样中15种金属元素 总被引:4,自引:0,他引:4
采用微波消化-电感耦合等离子体质谱法测定尿样中的15种金属元素,方法回收率81%-107%,相对标准偏差为1.14%-6.71%,方法具有快速、简便、灵敏、准确的优点,对探索微量元素与健康的关系具有十分重要的意义。 相似文献
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近年来,消化熟化方法已经被广泛采用来制备单分散纳米粒子,特别是在制备亚10 nm的小尺寸纳米粒子方面具有显著优势.但是,目前国内尚未发现关于此方法的中文文献报道,影响了部分国内学者对消化熟化方法的认识和应用.因此,从纳米尺度的消化熟化现象的发现过程和机理的提出开始,分析了沉淀反应前驱物、消化熟化剂种类、热处理温度和时间、溶剂类型以及其他因素对消化熟化现象的影响,介绍了基于颗粒表面带电与曲率效应、颗粒表面与配体分子层的相互作用以及消化熟化过程中的竞争反应平衡等因素的理论模型和研究结果,阐述了消化熟化法在制备金属纳米粒子、合金纳米粒子、金属氧化物和硫族化合物量子点以及其他纳米粒子等单分散纳米材料中的应用,最后展望了消化熟化法制备的单分散纳米粒子在纳米组装和多相催化等领域的应用. 相似文献
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微波消化技术在生物微量元素测定中的应用 总被引:6,自引:0,他引:6
用微波消化技术消化了多种食物样品.与传统的干、湿消化法相比,微波消化更加简单、快速、节省、沾污少、损失少、环境污染少.用原子吸收测定样品中的Fe,C.V<2%,加标回收率为98%~100%,测定美国生物标准物质牛肝中的Fe的相对误差为0.3%,结果令人满意. 相似文献
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ICP—AES法分析植物样品中营养元素的应用研究 总被引:1,自引:0,他引:1
本文采用微波消化样品建立植物样品中营养元素的ICP-AES测定方法。通过实际样品的分析,初步探讨了葡萄,苹果等植株中B,Ca,Cu,Fe,Mg,P,S,Zn等元素含量变化与施肥的关系,为植物果树营养诊断提供了有益的参考。 相似文献
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颜世铭 《广东微量元素科学》2008,15(10):66-66
(1)消化性溃疡的概念,消化性溃疡包括十二指肠溃疡和胃溃疡。前者较后者多见。总发病率约占人口的10%。消化性溃疡的发生受制于致溃疡的侵蚀因素与保护黏膜的机制。本病的发病与发作有明显的季节性,常发生于秋冬之交与冬春之交。 相似文献
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探讨了采用不同的预处理方法对中草药中微量元素含量测定结果的影响。结果表明,湿式消化法优于干式灰化法,所测中草药中锌、铜、锰、铁、铅和镉的数值较高,这可能与湿式消化法处理样品时,元素被挥发、损耗和吸附较少有关。 相似文献
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测定天然和栽培缬草根金属元素的微波和干灰化消解-FAAS法 总被引:6,自引:0,他引:6
采用微波消化法和马弗炉干灰法处理天然和栽培缬草根样品,火焰原子吸收光谱法连续测定样品中金属元素,分别检出12种和11种元素,其中Zn、Cu、Fe、Co、Mn、Ni、Cr为生命必需微量元素;两种样品各用两种消化法处理,测得金属元素及含量有差异,干灰法操作简单,但消化温度高、时间长、易挥发、元素容易损失,使检测值偏低;而微波消化法简便、省时、损失减少;两种消化法的加标回收率分别为95%-100%和96%-105%。 相似文献
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Jiaqi Liu Hongbing Zhou Li Song Zhanjun Yang Min Qiu Jia Wang Songli Shi 《Molecules (Basel, Switzerland)》2021,26(13)
Anthocyanins are natural products that give color to plants. As natural plant pigments, anthocyanins also have a series of health-promoting benefits. Many researchers have proved that anthocyanins have therapeutic effects on diseases, such as circulatory, nervous, endocrine, digestive, sensory, urinary and immune systems. Additionally, a large number of studies have reported that anthocyanins have an anticancer effect through a wide range of anti-inflammatory and antioxidant effects. The anti-disease impact and mechanism of anthocyanins are diverse, so they have high research value. This review summarizes the research progress of anthocyanins on the pharmacological agents of different diseases to provide references for subsequent research. 相似文献
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谭子燕 《广东微量元素科学》1996,3(3):46-48
从疡科溃疡虚证论治消化性溃疡,用补托生肌法,自拟富含硒及维生素E的生肌玉露饮治疗气血两虚型溃疡病18例,结果治愈11例,总有效率88.9%。 相似文献
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橙皮甙与橙皮甙铜配合物生物活性的比较研究 总被引:5,自引:0,他引:5
试验结果表明,橙皮甙配合铜离子后,其抗炎性水肿作用和对小白鼠的体胃肠平滑肌推进运动加强,但对家兔离体肠管平滑肌则起先抑制、后兴奋的作用,口服途径较注射橙皮甙铜配合物的抗炎作用降低,可能与口服后该配合物易在消化道被解离,影响了铜离子吸收有关。 相似文献
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The daily diet is important for our survival, health, and wellbeing. Functional food materials, which tailor the digestion process, can help maintaining and even improving human health and lifestyle. Knowledge on how food products, particularly food emulsions such as milk, interact with the digestive system, where they transform into supramolecular structures, can have a direct impact on the rational design of such advanced materials for functional food delivery applications. These materials have the potential to be personalized to digestive conditions and dietary nutrient requirements of the consumer or patient. They could help maintaining the uptake of codelivered nutrients and drugs even under compromised digestion conditions such as a fat maldigestion, a low bile salt concentration, or a limited lipase action. Such conditions are found, for instance, in preterm infants or patients with digestive disorders such as chronic pancreatitis or pancreatic insufficiency. Tailored nanostructure formation and transformation in these materials may further trigger the digestion rate and thus have an impact on the related feeling of satiety, which may help curing eating disorders and reduce the societal challenges of obesity and related diseases. In this contribution, the specific focus is set on discussing the equilibrium and dynamic colloidal properties of food emulsion droplets during digestion and their implications for designing nature-inspired functional food materials. These investigations provide a perspective toward the design of personalized food colloids. 相似文献
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Adrian Eugen Rosca Mara Ioana Iesanu Carmen Denise Mihaela Zahiu Suzana Elena Voiculescu Alexandru Catalin Paslaru Ana-Maria Zagrean 《Molecules (Basel, Switzerland)》2020,25(23)
Capsaicin is a widespread spice known for its analgesic qualities. Although a comprehensive body of evidence suggests pleiotropic benefits of capsaicin, including anti-inflammatory, antioxidant, anti-proliferative, metabolic, or cardioprotective effects, it is frequently avoided due to reported digestive side-effects. As the gut bacterial profile is strongly linked to diet and capsaicin displays modulatory effects on gut microbiota, a new hypothesis has recently emerged about its possible applicability against widespread pathologies, such as metabolic and inflammatory diseases. The present review explores the capsaicin–microbiota crosstalk and capsaicin effect on dysbiosis, and illustrates the intimate mechanisms that underlie its action in preventing the onset or development of pathologies like obesity, diabetes, or inflammatory bowel diseases. A possible antimicrobial property of capsaicin, mediated by the beneficial alteration of microbiota, is also discussed. However, as data are coming mostly from experimental models, caution is needed in translating these findings to humans. 相似文献
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Hepcidin in iron metabolism 总被引:5,自引:0,他引:5
Loréal O Haziza-Pigeon C Troadec MB Detivaud L Turlin B Courselaud B Ilyin G Brissot P 《Current protein & peptide science》2005,6(3):279-291
Hepcidin, which has been recently identified both by biochemical and genomic approaches, is a 25 amino acid polypeptide synthesized mainly by hepatocytes and secreted into the plasma. Besides its potential activity in antimicrobial defense, hepcidin plays a major role in iron metabolism. It controls two key steps of iron bioavailability, likely through a hormonal action: digestive iron absorption by enterocytes and iron recycling by macrophages. In humans, this could explain that low levels of hepcidin found during juvenile haemochromatosis and HFE-1 genetic haemochromatosis are associated with an iron overload phenotype. Conversely, an increase of hepcidin expression is suspected to play a major role in the development of anemia of chronic inflammatory diseases. However, the regulatory mechanisms of hepcidin expression are multiple, including iron-related parameters, anemia, hypoxia, inflammation and hepatocyte function. Therefore, many physiological and pathological situations may modulate hepcidin expression and subsequently iron metabolism. A better knowledge of the biological effects of hepcidin and of its expression regulatory mechanisms will clarify the place of hepcidin in the diagnosis and treatment of iron-related diseases. 相似文献
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对国标5750-85双硫腙分光光度法中消化水样时铅的灰化损失进行了探讨,针对某些污染严重的水样,改进了消化处理的条件,有效地消除了灰化损失,提高了铅加标回收率,保证了分析测试数据的精密度和准确度。 相似文献
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The wood powder and extract of Xanthoceras sorbifolia are used to treat rheumatism, gout, and other diseases in Mongolian medicine. Information on the pharmacokinetic differences between various forms of the herb drug is needed. Eight Xanthoceras constituents were examined simultaneously in rat plasma by ultra liquid chromatography-triple quadrupole mass spectrometry. In vitro experiments were performed to determine the influence of digestive juices on the pharmacokinetic profiles. Epicatechin and dihydromyricetin had higher AUC values in rats that were gavaged with X. sorbifolia extract versus the pure compounds. The AUC value of epicatechin in rats that were gavaged with X. sorbifolia wood powder was higher than that with the methanol extract. The nonextractable epicatechin polymer in the wood powder could be degraded to epicatechin by gastric juice, consequently elevating the epicatechin levels in blood. 相似文献