The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 10, 2025
Filed:
Aug. 05, 2022
Bmg Incorporated, Kyoto, JP;
Chikara Kubota, Kagoshima, JP;
Takaaki Ando, Kagoshima, JP;
Suong-Hyu Hyon, Uji, JP;
Woogi Hyon, Kyoto, JP;
Shuji Imamura, Aira, JP;
Satoru Gessei, Kanoya, JP;
BMG Incorporated, Kyoto, JP;
Abstract
Provided are a cryopreservation liquid for bovine reproductive cells such as bovine sperms and a cryopreservation method thereof. Adopted is a cryopreservation liquid comprising: 0.3 to 0.9 w/w % of an amphoteric polyelectrolyte (an antifreeze polyamino acid), which is ε-poly-L-lysine having a number average molecular weight of 1,000 to 20,000 wherein 50 to 99 mol % of amino groups of the ε-poly-L-lysine are blocked as carboxylated by having been reacted with the succinic anhydride; and 2 to 4 w/w % of glycerol, as dissolved in a physiological solution. A preferred embodiment of the cryopreservation method comprises steps of: primary diluting, in which bovine semen is diluted to 2.5 to 10 times with a physiological solution and kept at 2 to 8° C.; and secondary diluting, in which the bovine semen is diluted to 5 to 20 times while being kept at 2 to 8° C., by adding dropwise a physiological solution containing the amphoteric polyelectrolyte (antifreeze polyamino acid) and glycerol to a suspension obtained in the primary diluting.