CRISPR-LpCas9 GENE EDITING SYSTEM AND APPLICATION THEREOF

    公开(公告)号:US20210388392A1

    公开(公告)日:2021-12-16

    申请号:US17243079

    申请日:2021-04-28

    摘要: The present invention discloses a CRISPR/LpCas9 gene editing system and application thereof, the CRISPR/LpCas9 gene editing system includes a complex of LpCas9 protein and sgRNA, which can accurately locate a target DNA sequence and cleave DNA double strands. The LpCas9 protein has an amino acid sequence shown in SEQ ID NO:1; and the sgRNA has a nucleotide sequence shown in SEQ ID NO:2, or a modified sgRNA sequence based on SEQ ID NO: 2. The present invention can effectively solve the problems of heterologous codon bias and cytotoxicity in the application of SpCas9 in Lactobacillus paracasei. The gene editing is performed in cells or in vitro by introducing artificially designed CRISPR RNA and a repair template, which solves the problem of low electroporation efficiency caused by the strains' characteristics or relatively large carried plasmids, and has broad application prospects in the field of gene editing.

    Preparation method of instant bone milk

    公开(公告)号:US11134697B2

    公开(公告)日:2021-10-05

    申请号:US16362587

    申请日:2019-03-22

    IPC分类号: A23C9/18 A23C9/152

    摘要: The present invention discloses a preparation method of instant bone milk, including: washing edible animal bones and then crushing, adding a certain amount composite effect enhancer, performing two high pressure hydrolysis-instantaneous pressure relief in high pressure hydrolysis chamber, collecting liquid-phase materials, performing centrifugation for degreasing, wet sieving, homogenizing, spray drying to obtain powdered instant bone milk. A device for preparation method of instant bone milk comprises a high-pressure hydrolysis tank, a grading conveying pipe and a gas-liquid separator. The instant bone milk prepared by the present invention has stable chemical structure, uniform particle size distribution and regular normal distribution, high protein solubility and good solution stability. And the preparation method has simple process, low cost equipment and good versatility.

    Method for adjusting porous structure and texture of freeze-dried pectin aerogel

    公开(公告)号:US11795242B1

    公开(公告)日:2023-10-24

    申请号:US18336627

    申请日:2023-06-16

    IPC分类号: C08B37/00

    CPC分类号: C08B37/0045

    摘要: Disclosed is a method for regulating a porous structure and texture property of a freeze-dried pectin aerogel, which comprises the following steps of step 1: preparation of pectin/starch solution by mixing pectin powder and a gelatinized starch solution to form a stable pectin/starch mixed solution, a concentration of the pectin being 0.05% to 0.2% (w/v); step 2: induction of gel reaction by adding D-(+)-Glucono-δ-lactone and calcium carbonate into the stable pectin-starch mixed solution; and step 3: vacuum freeze of the starch/pectin composite gel subjected to the gel reaction to obtain the freeze-dried pectin/starch aerogel with an adjustable porous structure and an improved texture characteristic. Controllable regulation of the porous structure of the freeze-dried pectin aerogel is achieved by the method without complex pretreatment. Raw material ingredients applied in the method are cheap, easy-to-access, and has low-toxicity.