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    • 2. 发明申请
    • SOLID-PHASE BINDING ASSAY SYSTEM AND METHOD FOR INTERFEROMETRICALLY MEASURING ANALYTES BOUND TO AN ACTIVE RECEPTOR
    • 固相结合测定系统和用于间断测量分析物与活性受体有关的方法
    • WO1995001554A1
    • 1995-01-12
    • PCT/US1994007184
    • 1994-06-24
    • FIRST MEDICAL, INC.GUSTAFSON, Eric, K.ALLEN, Jimmy, D.COBB, Michael, E.
    • FIRST MEDICAL, INC.
    • G01J03/45
    • G01N21/45G01N21/75G01N2021/1748G01N2021/1759G01N2021/752Y10S435/97
    • Apparatus (10) and method for detecting and measuring analyte in biological and other sample solutions. A substrate (20) is provided with at least one active region which specifically binds analyte and an inactive region that does not, and a change in optical path length through the active region due to binding of analyte is measured. The substrate (20) is inserted into one or both beams of an interferometer (10) and moved relative to the interferometer (10). As the substrate (20) moves, the active and inactive regions pass successively through the beam(s) causing a periodic phase shift in the light. When the beams, one or both of which have undergone phase modulation, are recombined with each other, the phase modulation is converted into an amplitude modulation. Each recombined beam is directed to a photodetector (42, 45), which converts the periodically varying optical power into a periodically varying electrical signal. This signal has an amplitude proportional to the amount of bound analyte on the surface of the substrate (20) and a signal frequency equal to that at which the active regions move past the beam(s) in the interferometer (10). Servo control (60, 62, 65) is used to maintain the interferometer at a desired operating point that maximizes the sensitivity and linearity of the system so that the small phase differences due to analyte binding can be measured more accurately.
    • 用于检测和测量生物样品和其他样品溶液中分析物的装置(10)和方法。 衬底(20)设置有至少一个特异性结合被分析物的活性区域和不受分析物结合的活性区域的光路长度的变化,并且由于分析物结合而导致的光路长度的变化。 衬底(20)插入干涉仪(10)的一个或两个光束并相对于干涉仪(10)移动。 当衬底(20)移动时,有源和无源区域依次通过光束,导致光中的周期性相移。 当其中一个或两个已进行相位调制的波束彼此重新组合时,相位调制被转换成幅度调制。 每个重新组合的光束被引导到光电检测器(42,45),其将周期性变化的光功率转换成周期性变化的电信号。 该信号具有与衬底(20)表面上结合的分析物的量成比例的幅度和等于有源区移动通过干涉仪(10)中的束的信号频率的信号频率。 伺服控制(60,62,65)用于将干涉仪保持在使系统的灵敏度和线性度最大化的期望工作点,从而可以更准确地测量由分析物结合引起的小的相位差。