| 摘要 |
The present invention relates to a method for screening a sol composition for sol-gel biochips, which is used to immobilize a probe on a surface-untreated substrate, also relates to a sol composition screened by said method and a sol-gel biochip comprising said sol composition immobilized thereon. The sol composition screened by the disclosed method can be mixed with a probe, and the sol mixture can be integrated on 96-well plates, which are widely used in existing bioassays, without surface treatment. Also, the biochip can provide a sensitive and specific good analysis results because this immobilization methods of probe maintain the nature of probes without modification. |
| 主权项 |
1. A method for screening a sol composition for sol-gel biochips, which is used to immobilize a probe on a surface-untreated substrate, the method comprising the steps of:
(a) obtaining a first library of sol compositions wherein at least one silicate monomer selected from the group consisting of tetramethylorthosilicate (TMOS), methyltrimethoxysilane (MTMOS), tetraethylorthosilicate (TEOS), ethyltrimethoxysilane (ETrEOS), trimethoxysilane (TMS), methyltrimethoxysilicate (MTMS) and 3-aminopropyltrimethoxysilicate (3-ATMS), and at least one additive selected from the group consisting of polyglyceryl silicate (PGS), diglyceryl silane (DGS), 3-glycidoxypropyl trimethoxysilane (GPTMOS), (N-triethoxysilylpropyl)-O-polyethylene oxide urethane (PEOU), glycerol and polyethylene glycol (PEG) having a molecular weight of 100-10,000, are mixed with each other in buffer at various ratios; (b) spotting the first library of sol compositions on a surface-untreated target substrate; (c) measuring the adhesion, appearance, transmittance and gelling time of the spots formed in the step (b), and selecting, based on the measurement results, compositions, which do not show the detachment of spots even when they are scratched with a tip after washing, have a spot diameter of 100-800 μm while maintaining a circular shape, show a self-fluorescence lower than background fluorescence, and have a gelling time of 4-48 hours in a tube and a gelling time of 1-4 hours on the spots of the substrate, thereby obtaining a second library of sol compositions; (d) adding a probe to the second library of sol compositions and spotting the probe-containing second library on a surface-untreated substrate; and (e) measuring the immobilization rate of the spots for the probe, and the specificity between the probe and a target substance, and selecting, based on the measurement results, a sol composition wherein the immobilization rate of the probe is at least 70% and the ratio of specific signals/non-specific signals of the probe and the target substance is at least 3. |
