Solid enzyme type time-temperature indicator and preparation method thereof

An indicator and time technology, applied in thermometers, material analysis by observing the influence of chemical indicators, thermometers with physical/chemical changes, etc., can solve the problems of wasting food safety, difficult temperature monitoring, hidden dangers, etc., to achieve Eliminate easy leakage, good visual effect, and easy production
CN110617899AInactive Publication Date: 2019-12-27HENAN UNIV OF ANIMAL HUSBANDRY & ECONOMY
6 Cites 1 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
HENAN UNIV OF ANIMAL HUSBANDRY & ECONOMY
Publication Date
2019-12-27
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

A solid enzyme type time-temperature indicator is composed of two parts, namely a laccase PVA gel slice and a guaiacol PVA gel slice, when in use, the two parts fit to form the solid enzyme type time-temperature indicator, wherein the laccase PVA gel slice is a PVA gel slice embedded with laccase, and the guaiacol PVA gel slice is a PVA gel slice embedded with guaiacol. The solid enzyme type time-temperature indicator provided by the invention has the beneficial effects that the solid enzyme type time-temperature indicator can be used for indication of freshness of food with the activation energy of 9.5-68.8kJ / mol, a hidden danger that leakage of a liquid-state TTI package can be easily caused can be completely eradicated, and an indicator does not need to be additionally added like lipase, amylase and urease; the method provided by the invention avoids the situation that using effect of TTI is influenced as diffusion of an enzyme and substrate is hindered by embedding and biological activity of the enzyme is reduced, and the PVA gel slices are used as a carrier, so that a system is uniformly mixed, color distributioh is also relatively uniform, lump and flocculent color blocks cannot be formed, and the solid enzyme type time-temperature indicator is easy to make, stable in effect, low in cost and easy to popularize.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to the field of intelligent packaging, and in particular relates to an indicator that records the cumulative effect of time and temperature through color changes, which can be used to indicate the freshness of food during storage, transportation and sales. Background technique

[0002] People often think: "As long as the packaged food is within the shelf life, it should be safe." In fact, sometimes this is not the case. For products transported in the cold chain, their quality is not only affected by the product's own composition factors, but also affected by external environmental conditions, among which the influence of temperature is often the most important, because the temperature is not easy in the process of storage, transportation and sales. As a result, the shelf life at the actual temperature is different from that at the standard temperature, resulting in unnecessary waste and food safety hazards.

[0003] Therefore, i...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More