產(chǎn)品概述
阿爾茨海默病的特點是在腦細胞外有斑塊存在與胞內(nèi)有神經(jīng)纖維原纏結(jié)存在。組成這些斑塊的蛋白質(zhì)是β -淀粉樣蛋白(Aβ),它是淀粉樣前體蛋白經(jīng)β -分泌酶和γ -分泌酶酶切后形成的40到43個氨基酸的多肽。在某些個體上,由于某些基因突變,或ApoE等位基因的表達,或其他尚未發(fā)現(xiàn)的因子的作用,導(dǎo)致了多肽的表達增加,而這些多肽Aβ 42與Aβ 43比Aβ 40 有更強聚集能力。所以,很多研究者推測Aβ 42與Aβ 43的增強釋放導(dǎo)致了Aβ的異常沉積,并毒害受損個體的腦神經(jīng)。在AD患者,腦脊液中Aβ 42水平減少被認為是AD的前兆。
產(chǎn)品原理
本實驗采用雙抗體夾心ELISA法??谷薃β Total單抗包被于酶標板上,同時加入標本、標準品和生物素化的抗人Aβ Total抗體,標本、標準品中的Aβ Total會與加入于孔中的生物素化的抗人Aβ Total抗體及包被于酶標板上的單抗結(jié)合,形成免疫復(fù)合物,游離的成分被洗去;加入辣根過氧化物酶標記的親合素,親合素與生物素特異性結(jié)合,游離的成分被洗去。加入顯色底物(顯色劑),若反應(yīng)孔中有Aβ Total,辣根過氧化物酶會使無色的顯色劑變藍,加終止液變黃。在450nm處測OD值, Aβ Total濃度與OD450值之間呈正相關(guān),可通過繪制標準曲線求出標本中Aβ Total濃度。
產(chǎn)品性能
1. 靈敏度:最小可測人Aβ Total達15pg/ml 。
2. 重復(fù)性:板內(nèi)、板間變異系數(shù)均<10%。
產(chǎn)品組分及儲存條件
名稱
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96 Tests
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48 Tests
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保存條件
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1. 抗體包被板條 (Microwell Plate)
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8×12
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8×6
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2-8℃
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2.標準品 (Standard)
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2 支(凍干)
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1 支(凍干)
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2-8℃
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3.濃縮生物素化抗體 100× (Biotin-Conjugate)
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2 支 (30μl/支)
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1 支(30μl/支)
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2-8℃
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4.濃縮酶結(jié)合物 100× (Streptavidin-HRP)
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2 支 (60μl/支)
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1 支(60μl/支)
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2-8℃(避光)
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5.試劑稀釋液 (Assay Diluent)
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2 瓶(25ml/瓶)
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1 瓶(25ml/瓶)
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2-8℃
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6.濃縮洗滌液 20× (Wash Buffer Concentrate)
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1 瓶 (30ml/瓶)
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1 瓶(30ml/瓶)
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2-8℃
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7.顯色劑 (Substrate Solution)
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1 瓶(12ml/瓶 )
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1 瓶(6ml/瓶)
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2-8℃(避光)
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8.終止液 (Stop Solution)
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1 瓶(12ml/瓶)
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1 瓶(12ml/瓶)
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2-8℃
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9.封板膠紙
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2 張
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2 張
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10.說明書
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1 份
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1 份
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試驗所需自備儀器和試劑:
1. 酶標儀(450nm檢測波長濾光片,570nm或630nm校正波長濾光片)。
2. 高精度加液器及一次性吸頭:0.5-10μl,2-20μl,20-200μl,200-1000μl。
3. 37℃恒溫箱、蒸餾水或去離子水、微量振蕩器、坐標紙。
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