38 results about "Mycoplasma contamination" patented technology

The invention discloses a method for preparing human umbilical cord mesenchymal stem cell exosomes. The method uses a newborn umbilical cord as a source of umbilical cord mesenchymal stem cells, usesa medium prepared by a fetal calf serum or a serum substitute in which exosome carried by itself is removedfor culturing, collects a supernatant, and further separates and extracts the exosomesby differential centrifugation, the purity is high, and the source of the umbilical cord mesenchymal stem cell exosomes is ensured; the exosomes is prepared by the differential centrifugation, the operationis simple, and the method is suitable for large-scale production; during the whole process, sterility is guaranteed, the contamination ofmycoplasma is prevented, and the product safety is higher.

The invention relates to a kit and a method for detecting mycoplasma pollution in CHO cultured cells, and belongs to the field of biological technology detection. The kit comprises a primer pair of the DNA sequence of a specific amplified CHO cell glyceraldehyde-3-phosphatedehydrogenase and a primer pair of the DNA sequence of a specific amplified mycoplasma 16srRNA conserved domain, and the two above primer pairs are placed in a same PCR system. According to the kit, when mycoplasma pollution is detected by employing the PCR technology, the determination of reliability of a detection result can be finished at the same time. The kit and the method help to substantially improve the reliability of the detection result on mycoplasma pollution in CHO cultured cells, the operation is simple, the detection period is short, and the sample detection operationality is good.

The invention provides a reagent for eliminating mycoplasma contamination in cell culture and a use method thereof. The reagent is prepared by mixing liquid A and liquid B isometrically or mixing liquid A, liquid B and liquid C isometrically, wherein the liquid A is prepared by mixing semisynthetic pleuromutilin derivatives and 0.01MPBS, and the mass-volume percentage concentration of the solute after mixing is 0.5-1.5%; the liquid B is prepared by mixing quinolone derivatives and 0.01MPBS, and the mass-volume percentage concentration of the solute after mixing is 0.5-1.5%; and the liquid C is prepared by mixing tetracycline derivatives and 0.01MPBS, and the mass-volume percentage concentration of the solute after mixing is 0.25-0.75%. The reagent and method provided by the invention havethe following beneficial effects: if contamination is not severe, the effect can be displayed within a week; and after the treatment cycle is finished, black spots do not exist among the treated contaminated cells, the growth cycles of the cells return to normal, the cell morphology is normal, and aggregated growth and netting phenomena are avoided.

The invention provides a new detection method for detecting mycoplasma contamination in a cell culture process and a detection kit. According to the new detection method and the detection kit, relatively conservative rDNA in mycoplasma is taken as a detection target segment, the detection is performed with a recombinase and polymerase based isothermal amplification technology by combination of specific primers and probes, so that operation is simple and convenient, detection time is shortened, and specificity and accuracy of mycoplasma contamination detection are improved.

The invention provides a kind of product that can prevent the contamination in cell cultivating. The characteristic of the product is that every liter product contains 1-50g ethyl ciprofloxacin. The invention adds drug of certain density which can prevent and clear the contamination to the cell culture fluid to prevent the common contamination of bacteria and mycoplasma. The invention has overcome many defects of common drugs such as short drug action period, short shelf life, high price and unable to preserve in ambient temperature. The invention can not only be used in cell cultivating, it can also be used to clarify other organic medium materials, wash the commonly used apparatus or clarify the separating and purifying materials in emergency.

The difficult problem of the contamination of cell cultured mycoplasma and the infection diagnosis of various mycoplasma urgently need a reliable and effective kit. Mycoplasma culture by a fluorescent staining method is reliable but takes time and trouble, and culture pollution is intensified. A direct PRC method for amplifying a mycoplasma gene, which is used for the routine detection of the mycoplasma is easy for cross contamination, and high false masculinity is only used as an auxiliary reference. The invention relates to a mycoplasma conservative gene which across links a plant arabidopsis LEY sequence into a reporting gene DNA by a hybridization probe and amplifies the indirect detection of a reporting gene. The mycoplasma conservative gene is characterized in that mycoplasma 16sRNA is hybridized with the head part and the tail part of the LEY reporting gene DNA whose head part and tail part are provided with mycoplasma conservative sequence probes; the reporting gene DNA is catalyzed into a ring by heat-proof ligase, and the annular reporting gene is reversely amplified by PCR so as to indirectly reflect the detection of the mycoplasma; by adjusting ligase reaction, the reporting gene is difficultly across linked by the cross contamination, thereby reducing the false masculinity; and if a system is contaminated, the reporting gene can be changed.

The invention discloses a kit for obtaining lung stem cells through separation and a method. The lung stem cell separation kit comprises tissue digestive juice, embryo fibroblasts subjected to radiation treatment and a lung stem cell separation culture solution. With the adoption of the kit, a large quantity of amplified lung stem cells can be obtained effectively, and the obtained lung stem cells are good in activity, high in purity and free of bacterium and mycoplasma contamination.

The invention relates to a PCR (Polymerase Chain Reaction) method for detecting mycoplasma, belonging to the technical field of biological detection. In the invention, PCR amplification and electrophoresis are carried out by extracting mycoplasma nucleic acids and applying mycoplasma specific primers to judge whether mycoplasma contamination exists in a detection sample or not, wherein if 435bp specific strips appear in an electrophoretogram, the result shows that the mycoplasma exists in the sample, and if 435bp specific strips do not appear, the result shows that the mycoplasma does not exist in the sample. By the detection and verification, the detection system provided by the invention has the characteristics of high specificity, good stability, short checking period and the like.

The invention belongs to the field of stem cells, and discloses a primary isolation method of skin mesenchymal stem cells. The method comprises: after skin tissue is pretreated, digested with DispaseII disperse enzyme, washed, repeatedly blown to separate cells, filtered and centrifuged to obtain cell precipitates which are resuspended in Lonza complete medium and then inoculated into a culture dish for 60-90min; The unattached cell suspension was inoculated into fibronectin-coated culture plates, and the cells were passaged when the cell confluence reached 80% - 90%. A large numb of skin mesenchymal stem cells can be isolate by using that primary isolation method of the invention, and the cell membrane of the skin mesenchymal stem cells isolated and cultured is not damage, the cell culture is stable, and mycoplasma pollution is not introduced, the cell vigor is good, and the skin mesenchymal stem cells can be stably cultured in the follow-up.

The invention discloses a treatment method of mycoplasma contamination. The treatment method comprises the following steps: obtaining cells to be treated; culturing the cells to be treated by utilizing a culture medium containing 10mu.g/mL of ciprofloxacin; updating the culture medium at fixed time, and enabling the growth density of the cells to be treated to be kept at 50 percent to 80 percent; stopping utilizing the culture medium until no mycoplasma contamination condition is detected. According to the treatment method of the mycoplasma contamination, disclosed by the invention, mycoplasmas are removed by adopting a method of adding the ciprofloxacin into the culture medium and the aim that the mycoplasma contamination is completely removed under the condition that influences on the cells are small is realized, without the need of adopting a manner of inactivating firstly and discarding secondly; meanwhile, the treatment method also has the advantage that the mycoplasma contamination does not reoccur after the ciprofloxacin is not used.

Provided is a method for culturing cells, which prevents the possibility of mycoplasma contamination by culturing the cells using biomass extract obtained by culturing a strain with amphidinol productivity, preferably a strain such as Amphidinium klebsii, Amphididinium carterae, and the like belonging to Dinoflagellates, or using a fraction obtained from the extract; and a method for removing mycoplasma contamination of the cells by culturing the cells contaminated by mycoplasma using the amphidinol derivatives. In addition, provided is a method for removing mycoplasma contamination of the cells, including a combination of single cell-isolating enzyme solution treatment and cell aggregate removal.

The invention belongs to the technical field of biology and particularly relates to detection primers, a kit and a detection method for cell mcoplasma. The kit comprises a combination of two pairs ofprimers required for PCR (Polymerase Chain Reaction) amplification, wherein the primer combination can specifically amplify approximate 250bp sequences between 16S genes and 23S genes in various mycoplasmas; meanwhile, the amplification of two pairs of primers ensures the accuracy of test results. The kit also comprises a pre-reactive mixture required for the PCR amplification; the mixture comprises Taq enzymes, dNTP, a buffer solution and the like; the kit disclosed by the invention can quickly and efficiently distinguish whether mycoplasma contamination in the cell occurs or not and can obtain accurate detection result; meanwhile, batch detection can be realized.

The invention relates to a method for removing mycoplasma contamination in tumor cells and application of the method. The method comprises the steps that a tumor cell line with the positive mycoplasmas is transplanted into a mouse body with the NSI immune deficiency, the mouse is bred, then the tumor cell line is separated from the inside of the mouse body, and a tumor cell line with the negativemycoplasmas is obtained. Compared with a frequently-used method for removing mycoplasma contamination in cells at present, the provided method is simpler in operation process and safer, the factors ofantibiotics and high temperature are avoided, the damage to the cells can be reduced to the minimum, the treatment period is short, mycoplasma contamination in the tumor cells can also be thoroughlyremoved, and the relapse phenomenon cannot be easily caused.

The present invention discloses a reagent, a kit and a treatment method for treating mycoplasma contamination. The reagent is a solution containing antibiotic tiamulin, minocycline and antibiotic ciprofloxacin, wherein a concentration ratio of the antibiotic tiamulin to the minocycline to the antibiotic ciprofloxacin is 4:1:3. According to the present invention, with the reagent, the kit and the treatment method, the combination comprising the antibiotic tiamulin, the minocycline and the antibiotic ciprofloxacin according to the specific ratio is used, such that the mycoplasma contamination treatment effect can be significantly increased; and the mycoplasma contamination problem can be simply, safely, rapidly and effectively treated.

Mycoplasma contamination of a known cell line is detected by collecting a Raman spectrum of a targeted volume within a sample, the targeted volume containing a known cell line of interest, obtaining a reference spectrum uniquely associated with the known cell line where the obtained reference spectrum is known to be free of mycoplasma and comparing, using a processing device, the reference spectrum to the collected spectrum. Mycoplasma is further detected by identifying whether there are unnatural molecular compositions within the collected spectrum based upon the comparison of the reference spectrum to the collected spectrum and providing an indication as to whether mycoplasma is detected in the collected Raman spectrum based upon whether unnatural molecular compositions are identified within the collected spectrum.

The present invention relates to a method and a kit for the detection of low abundance RNA species in a biological sample and to a method and a kit for the detection of a mycoplasma contamination in a biological sample.

The invention provides a GPD1L-deleted human embryonic stem cell strain and a construction method and application thereof, and relates to the technical field of genetic engineering. According to a gene editing principle, sgRNA of a targeted GPD1L gene exon 4 is synthesized, a gene knockout plasmid is constructed, screening is carried out after human embryonic stem cells are transfected, a basic group A is inserted into the obtained GPD1L diallele exon 4, a termination codon TGA appears at the 157 amino acid position of protein after GPD1L expression, and protein translation is terminated in advance. The GPD1L-deleted human embryonic stem cell line has the advantages of GPD1L protein deletion, normal karyotype, normal stem cell pluripotent marker and good continuous passage stability, trigerm teratoma can be formed in an animal body, and mycoplasma pollution is avoided. The GPD1L-deleted human embryonic stem cell H9 line can be used for researching the influence of GPD1L deletion on the function of differentiated myocardial cells and the screening of therapeutic drugs.

The invention discloses a composition for efficiently removing mycoplasma contamination in a cell culture process. The composition is composed of antibacterial peptides BMAP-18 and BMAP-18-R9, whereinthe BMAP-18 has the function of killing mycoplasmas outside cells, and the BMAP-18-R9 enters the cells under the effect of R9 cell-penetrating peptides to kill the mycoplasmas in the cells. Through the combination of the BMAP-18 and the BMAP-18-R9, the mycoplasmas inside and outside the cells can be thoroughly killed. In this way, the BMAP-18 and the BMAP-18-R9 can be used separately or combinedly, and no toxic effect is caused on the cells when the peptides are within the concentration of 200 micromoles.

The invention discloses a method for treating contamination of suspension culture cells. The specific steps of the treatment method for suspension culture cells after contamination are as follows: S1, identification of pollution types, S2, treatment of fungal pollution, S3 treatment of mycoplasma pollution, S4 Bacterial contamination treatment. The method first distinguishes different pollution categories through different identification methods, and then treats different pollution sources separately. Compared with the traditional treatment method after cell pollution occurs, the present invention is simple and easy to implement, and has better treatment effect.

The invention discloses an LAMP primer group for detecting broad-spectrum mycoplasmas. The LAMP primer group consists of an outer primer F3, an outer primer B3, an inner primer FIP, an inner primer BIP, a loop primer LF and a loop primer LB, wherein the primers are respectively shown as SEQ ID NO.1-6. The invention further discloses a mycoplasma visible detection kit with the primer group, and application of the mycoplasma visible detection kit. The kit disclosed by the invention has advantages of good mycoplasma specificity, sensitivity, rapid and efficient amplification, visible identification and the like. By adoption of the detection system disclosed by the invention, normal mycoplasma contamination can be rapidly and sensitively detected in the cell culture process under an isothermal condition of 60-62 DEG C, no complex instrument is needed, and mycoplasma contamination detection in a cell laboratory at regular time can be relatively well achieved.

The invention relates to a method capable of improving the cell state and application thereof. The method comprises the steps of transplanting a mycoplasma positive cell line into the body of an immunodeficient mouse, raising the mouse, and separating a cell line from the body of the mouse to obtain a mycoplasma negative cell line. Compared with current common methods for removing mycoplasma contamination in cells, the method for removing mycoplasma contamination in cells has a simpler and safer operation flow; meanwhile, the method avoids antibiotic and high-temperature factors, can minimize the damage to cells, has a shorter treatment cycle and can also completely remove mycoplasma contamination without a relapse.

The invention relates to the technical field of biology, and aims to provide a method for eliminating mycoplasma contamination of PCV2 (Porcine Circovirus Virus 2). The method for eliminating the mycoplasma contamination of the PCV2 comprises the following steps: filtering the PCV2 through a 0.1-micrometer bacteria filter, and breeding for 4 generations; treating two generations of the PCV2 by using Plasmocin with the final concentration of 2.5 micrograms/milliliter, and conventionally breeding the PCV2 for two generations. The method provided by the invention saves the experiment cost and more importantly, has the advantages of few antibiotic usage times, low concentration and short mycoplasma removing time by adopting a method of firstly filtering and then using antibiotics and can complete the integral treatment process for only 8 generations and 16-20 days without lowering the titer of the PCV2 viruses, provide the mycoplasma-free and high-titer PCV2 viruses for vaccine production and provide the guarantee for the increase of the virus content of a vaccine semi-finished product within unit volume.

The invention provides a PCR (Polymerase Chain Reaction) kit for detecting mycoplasma pollution in cell culture and application of the PCR kit. The composition disclosed by the invention comprises the following sequences: (1) an upstream primer Primer-Myc-F: TGAGTAGTATGCTCGCAAGAGTG, (2) an upstream primer, (3) a downstream primer, (4) an upstream primer and (5) a downstream primer, wherein the upstream primer is used for PCR (Polymerase Chain Reaction) amplification of a mycoplasma nucleic acid sequence; and (2) a downstream primer Primer-Myc-R: CGACACGAGCTGACGACAAC, which is used for carrying out PCR (Polymerase Chain Reaction) amplification on the nucleic acid sequence of the mycoplasma. The composition can be used for preparing a PCR kit. The composition or the kit can be used for mycoplasma detection. Compared with the existing PCR (Polymerase Chain Reaction) primer amplification method, the primer pair disclosed by the invention is optimized, so that Primer-BLAST shows that 528 products can be amplified, and the primer pair has high spectral property.