http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-109142340-B
Outgoing Links
| Predicate | Object |
|---|---|
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G01N21-78 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G01N21-78 |
| filingDate | 2018-08-07-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2021-06-22-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 2021-06-22-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CN-109142340-B |
| titleOfInvention | Solid enzyme type time-temperature indicator and preparation method thereof |
| abstract | The invention belongs to the field of intelligent packaging, and discloses a solid enzyme type time-temperature indicator which is formed by stacking a polyvinyl alcohol hydrogel film I containing tyrosine and a polyvinyl alcohol hydrogel film II containing immobilized tyrosinase in a closed container. The solid enzyme type time-temperature indicator obtained by the invention has long indication time and is easy to store. The invention also discloses a preparation method thereof: the method comprises the following steps: (1) mixing a polyvinyl alcohol aqueous solution and a tyrosine aqueous solution, and obtaining a hydrogel film I by a freezing-unfreezing method; (2) mixing the polyvinyl alcohol aqueous solution and the immobilized tyrosinase dispersion liquid, and obtaining a hydrogel film II by a freezing-unfreezing method; (3) and superposing the hydrogel film I and the hydrogel film II into two layers, and then packaging in a closed container to obtain the solid enzyme type time-temperature indicator. The preparation method has simple process and easy operation, and the whole process is solid, thereby avoiding the defect that the liquid is difficult to store. |
| priorityDate | 2018-06-07-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 92.