Quick-speed PCR quantitative determination method of sulfate-reducing bacteria direct dilution by multiple proportions
A quantitative detection method and multiple dilution technology, which is applied in the determination/inspection of microorganisms, biochemical equipment and methods, etc., can solve the problems of long detection cycle, inability to guide production in real time, and high detection cost
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[0005] Specific embodiment 1: This embodiment is a method for rapid quantitative detection of sulfate-reducing bacteria by direct doubling dilution PCR, which sequentially includes the following steps: (1). Preparation of cell pretreatment buffer; (2). Bacterial cell Preparation; (3). Time ratio dilution; (4). PCR operation on ice; (5). PCR amplification on a thermal cycler; (6). 1.0% agarose electrophoresis detection; (7) Observe the results, check the table and count; the PCR reaction system in the process of "(4). Perform PCR operation on ice" is 20μl: including: Buffer (10×) 2μl, 0.3mmol·L -1 D NTP 2μl, concentration is 0.1μmol·L -1 The forward primer SRBF 1μl, the concentration is 0.1μmol·L -1 1μl of reverse primer SRBR, 0.3U rTaq enzyme, 11.7μl of deionized water for the rest, and then 2μl of sample.
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[0006] Specific implementation manner 2: The detailed operation process of this implementation manner is as follows:
[0007] (1). Preparation of cell pretreatment buffer: the mother liquor components of "Bacterial cell pretreatment buffer" are: 70g NaCi, 2g Kci, 12g Na 2 HPO 4 , 2g KH 2 PO 4 , 1‰ SDS; Dilute the mother liquor 10 times to become the pretreatment buffer of the bacteria; control the pH of the working solution to 7.5 and sterilize it at 121°C for 15-30 minutes.
[0008] (2). Preparation of bacterial cells: The following steps are included in sequence: a. The preparation of bacterial cells is completed under an ultra-clean workbench, which needs to be sterilized by ultraviolet light for 20-40 minutes, and then used with high-purity nitrogen Take 1mL of the oilfield sewage water sample retrieved by the anaerobic tube or bioreactor sludge and inject 1mL into the sterilized 1.5mL centrifuge tube; b. Fully shake the oilfield sewage water sample on the shaker 3~6min, fully...
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[0014] Specific embodiment 3: In this embodiment, the oilfield sewage retrieved by the anaerobic tube containing high-purity nitrogen is used as the test sample, and the five-tube parallel method is used to perform the PCR operation on ice, with 5 samples for each gradient. 1.0% agarose electrophoresis detection, the detection result is as follows figure 1 , figure 2 Shown. Observe the results, check the meter and count.
[0015] The specific look-up table calculation method is: select the last three serial dilution gradients (10 x , 10 x+1 , 10 x+2 ), the number of tubes with bacterial DNA bands is arranged in the order of the dilution gradient from small to large into a three-digit number called the band approximate value (abc). Among them, the first dilution gradient (10 x ) Is the last dilution gradient with bacterial DNA bands in the last 5 test tubes. If the third dilution gradient (10 x+2 ) There are still bacterial DNA bands appearing in the next gradient dilution tube, t...
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