3.3. Evaluation of the preservative effect of TLS and TLS formulation on apple juice
Apple juice was produced in the laboratory by a process of sequential cold crushing, colour protection (prevention of browning) by ascorbic acid, gauze filtration, polyphenol oxidase inactivation, pectinase and amylase treatment, clarification and
concentration. The juice was treated with TLS and TLS formulation as described in Section
2.5.2
The measured physicochemical and microbial parameters are presented in
Tables 3 and 4
The three groups of apple juice were different in their
physicochemical properties. There were no significant changes on physicochemical properties and no microorganism growth from day 0 to day 4 for the TLS formulation group (150 ppm TLS).
In contrast, the blank showed a dramatic drop of light transmittance and coloured levels, as well as microbial growth, could be seen in apple juice. For the TLS group, although there was no microorganism growth, the light transmittance and colour value decreased greatly.
One possible reason was that the solubility of TLS dropped at the concentration of 500 ppm after 4 days of storage
3.3. Evaluation of the preservative effect of TLS and TLS formulation on apple juiceApple juice was produced in the laboratory by a process of sequential cold crushing, colour protection (prevention of browning) by ascorbic acid, gauze filtration, polyphenol oxidase inactivation, pectinase and amylase treatment, clarification andconcentration. The juice was treated with TLS and TLS formulation as described in Section2.5.2The measured physicochemical and microbial parameters are presented inTables 3 and 4The three groups of apple juice were different in theirphysicochemical properties. There were no significant changes on physicochemical properties and no microorganism growth from day 0 to day 4 for the TLS formulation group (150 ppm TLS). In contrast, the blank showed a dramatic drop of light transmittance and coloured levels, as well as microbial growth, could be seen in apple juice. For the TLS group, although there was no microorganism growth, the light transmittance and colour value decreased greatly.One possible reason was that the solubility of TLS dropped at the concentration of 500 ppm after 4 days of storage
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