6 results about "Time temperature indicator" patented technology

The application discloses an oil oxidation type time-temperature indicator, which comprises a sealed container which is partially or wholly transparent, vegetable oil and a thio-barbituric acid color developing agent which are packaged in the sealed container. The application mixes the vegetable oil and the thio-barbituric acid color developing agent to prepare an oxidation indicator, and the oxidation degree of food containing the same vegetable oil can be indicated by using the color developing reaction of the vegetable oil oxidation product and the thio-barbituric acid color developing agent, and the color change is irreversible. The oxidation indicator is packaged in the sealed container which is partially or wholly transparent, so that the oil oxidation indicator with small volume, convenient use and direct indication is prepared. The problem that the color change of the existing time-temperature indicator for food containing vegetable oil is not obvious or reversible is solved.

The invention discloses a time and temperature indicator based on ferrous-tannic acid and application of the time and temperature indicator in food freshness monitoring, the time and temperature indicator (TTI) comprises a body and a time and temperature indicator body arranged in the body, the time and temperature indicator body comprises a pH buffering agent, ferrite and tannic acid, the molar ratio of the ferrite to the tannic acid is (2-8): (1-5), and the pH of the pH buffering agent is 1-7. The method can be widely matched with the decay kinetics of different food systems, and breaks through the key bottleneck that the applicability of the traditional TTI is limited.

The present invention provides a quality determining system capable of acquiring temperature information of an environment in which an object is placed, and the quality of the object, with high accuracy. The quality determining system of the present invention is provided with a quality indicator (100) and a determining device (200). The quality indicator (100) is provided with a time-temperature indicator (110) and a unique ID unit (120) from which unique ID information of the object is read. The unique ID information includes information identifying the object and data acquired from the time-temperature indicator (110) of the object. The determining device (200) comprises: an information acquiring unit (420) that acquires the color density of the time-temperature indicator (110) associated with acquired unique ID information; a time-color density calculating unit (510) that calculates an amount of change in the color density of the time-temperature indicator (110) and the elapsed time from a date and time serving as a starting point; and a temperature calculating unit (520) that uses a rate of change in the color density, the amount of change in the color density, and the elapsed time to obtain a plurality of combinations of the time and temperature of the environment in which it can be considered that the object has been placed during the elapsed time.

This invention discloses a time-temperature indicator for determining whether frozen food has undergone room temperature thawing, its preparation method, and its application. The time-temperature indicator of this invention comprises: a single-stranded DNA forming a stem-loop structure, with fluorescent and quenching groups modified at both ends respectively; an exonuclease that specifically cleaves linear single-stranded DNA; and a dispersing solvent; the single-stranded DNA forming the stem-loop structure has no dangling sequences at its 5' and 3' ends, and the fluorescent and quenching groups are close to each other, thus not producing fluorescence; in the dispersing solvent, the melting temperature T of the single-stranded DNA stem-loop is... m The temperature range is 0℃–25℃. The time-temperature indicator of this invention achieves irreversible fluorescence changes from freezing to room temperature by modifying a stem-loop structure of a single-stranded DNA sequence with fluorescent and quenching groups, as well as by the cleavage of linear single-stranded DNA by exonucleases. This allows for accurate determination of whether a frozen product has been thawed at room temperature.

The present application relates to phosphorescent encryption time-temperature indicator label and its preparation method and application, belong to cold chain transportation technical field.The technical problem solved by the present application is to provide phosphorescent encryption time-temperature indicator label.The label includes paper base and phosphorescent composition attached to the paper base;The phosphorescent composition includes phosphorescent molecules, polyacrylic acid and boric acid.The phosphorescent encryption time-temperature indicator label of the present application will not change significantly during transportation, avoiding the replacement or tampering of the time-temperature indicator after learning the chain breaking result during transportation;The kind of phosphorescent molecules can be screened to realize the regulation of response time, so as to be used in cold chain transportation scene with different chain breaking monitoring time requirements;Without complex electronic components or multi-layer precision structure, the preparation process is relatively simple, and batch production can be achieved by coating, printing and other methods;The material cost is low, and it has good economy, and is suitable for large-scale popularization and application in various cold chain packaging.

The invention discloses a preparation and application method of an enzyme type capsule time temperature indicator, and relates to the technical field of detection.The preparation and application method comprises the steps that first, first linear regression equations under different dilution multiples are established, and then reaction endpoint time under the dilution multiples is calculated; calculating a standard original enzyme activity unit and standard reaction time, and establishing a second linear regression equation under different dilution multiples by taking the enzyme activity unit as an independent variable and the logarithm of absorbance as a dependent variable; adopting a 100 [mu] L capillary tube, sintering one end of the capillary tube by using an alcohol blast burner, adding the enzyme liquid with the dilution multiple by using a microsyringe after cooling, clamping the part filled with the enzyme liquid by using a frozen clamp, and sintering the other end of the capillary tube by using the alcohol blast burner to obtain the enzyme type capsule time temperature indicator. An enzyme type capsule time temperature indicator is used for calculating accumulated heat in the whole heat sterilization process, the heat sterilization intensity is evaluated, and the experiment cost and time are saved.