25-OH Vitamin D HPLC Assay
The 25-OH Vitamin D HPLC Assay is For Research Use Only
Size: 100 tests
Incubation Time: 15 minutes
Sample Type: Plasma, Serum
Sample Size: 400 µL
Controls Included
Reference Values (Normal):
Summer 50-300 nmol/l (20-120 µg/l)
Winter 25-150 nmol/l (10-60 µg/l)
It is suggested that each laboratory establish its own normal ranges
Product Developed and Manufactured in Germany
Product Support in the USA
Assay Background
Vitamin D is one of the most important essential bioregulators of the Ca2+- and phosphate metabolism in higher animals. Together with the peptide hormones parathormone and calcitonin it is responsible to obtain the Ca2+- and phosphate homoeostasis. The most important physiological functions of vitamin D are the stimulation of the intestinal resorption of Ca2+ and phosphate and their incorporation in the bone matrix.
D-vitamins or calciferols arise from provitamins by the UV radiation of sunlight catalyzed splitting of the B-ring of the steran backbone. In the skin, formed vitamin D3 is bound to a vitamin D binding-protein in the plasma, transported into the liver and hydroxylated in position 25 to form 25-OH vitamin D3. Another hydroxylation is performed in the kidney to yield 1,25 (OH)2 vitamin D3 and 24,25 (OH)2 vitamin D3. 1,25 (OH)2 vitamin D3 is the metabolic most active form of vitamin D. Nevertheless, more than 95% of 25-OH vitamin D is 25-OH vitamin D3. A lack of vitamin D leads in growing humans and animals can lead to rickets, hypocalcaemia and secondary hyperparathyroidism and in adults to osteomalacia.
The Eagle Biosciences 25-OH Vitamin D3 HPLC Assay kit makes it possible to determine the vitamin in an easy, fast and precise method. The kit includes all reagents in ready to use form for preparation and separation of the samples with exception of the column (IC3401rp) and the controls (IC3401ko). Both can be supplied by Eagle Biosciences. Beside the complete test kit, it is possible to order all components separately. Please request our single component price list.
Related Products
25-OH Vitamin D HPLC Assay Control Set
25-OH Vitamin D HPLC Assay Column
25-OH Vitamin D ELISA Assay Kit
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2. 检查流程:
(1) 检查时先让患者口服一粒碳14尿素胶囊。
(2) 静坐25分钟后,受试者直接向集气瓶内呼气,患者呼气后集气瓶中的液体由粉红色变成无色为止,或者患者持续呼气时间已经达到3分钟后即可停止呼气。
(3) 向集气瓶中加入4.5ml稀释闪烁液后,加盖旋紧,置于液闪仪中进行检测。
(4) 检查过程中患者应当保持安静,剧烈运动后血中的酸碱度变化可能影响同位素标记CO2的呼出,另外在患者呼气时应当嘱咐患者注意不要将集气瓶中的液体误吸入口腔。向左转|向右转
SAMPOSCPMELAPSEDSAMPLETOTALELAPSED
TIME(MIN)TIME(MIN)
1**-1827543.90.5250.892
765315.21.5251.892
729279.52.5002.867
这是使用同一个底物,但所测得值,不知道为什麽CPM值一直往下滑?
十分感谢!!!
mye-mail:pjlitao@tom.com
有几个问题想问问大家:
1.我看到相当多文献中,结束反应用的是抽滤,由于条件的限制,我们这里没有该装置,所以就取了少数文献中的方法,用12000G离心10min结束反应,然后沉淀TRIS-HCL洗涤3次。测量时在沉淀所在的EP管中加入闪烁液(该闪烁液的配方适用于样品含水量较少的情况),每管1ML。请问大家,这样结束反应行吗?沉淀是否应该烘干?
2.我用的液闪仪计数不是很稳定,如果进行校正,尤其是读数比较小的时候(如只有数百),以减少误差?
3.加入闪烁液后,是否应该避光放置一段时间后再测量?
谢谢!
有几个问题想问问大家:
1.我看到相当多文献中,结束反应用的是抽滤,由于条件的限制,我们这里没有该装置,所以就取了少数文献中的方法,用12000G离心10min结束反应,然后沉淀TRIS-HCL洗涤3次。测量时在沉淀所在的EP管中加入闪烁液(该闪烁液的配方适用于样品含水量较少的情况),每管1ML。请问大家,这样结束反应行吗?沉淀是否应该烘干?
2.我用的液闪仪计数不是很稳定,如果进行校正,尤其是读数比较小的时候(如只有数百),以减少误差?
3.加入闪烁液后,是否应该避光放置一段时间后再测量?
谢谢!
mye-mail:pjlitao@tom.com
碳14试剂检测方法
(1) 静坐25分钟后,受试者直接向集气瓶内呼气,患者呼气后集气瓶中的液体由粉红色变成无色为止,或者患者持续呼气时间已经达到3分钟后即可停止呼气。
(2) 向集气瓶中加入4.5ml稀释闪烁液后,加盖旋紧,置于液闪仪中进行检测。
(3) 检查过程中患者应当保持安静,剧烈运动后血中的酸碱度变化可能影响同位素标记CO2的呼出,另外在患者呼气时应当嘱咐患者注意不要将集气瓶中的液体误吸入口腔。
安全性
碳14尿素呼气试验应用于临床十几年,未见到明显的不良反应的报道。专业性评估报告证实碳14呼气试验对患者和操作人员的辐射危险可忽略不计,临床上可以安全使用。

