Effect of Precise Temperature Control on Low-temperature Preservation of Blueberries
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Abstract:
In order to study the application potential of precision temperature control technology in the preservation of blueberries, blueberries were divided into a control group and three precision temperature control groups, which were put into a foam box (CK), a foam box + cool-storage agent (ice temperature 1), a precision temperature control box (ice temperature 2), and a precision temperature control box + cool-storage agent (phase temperature). The temperatures inside the boxes were recorded every day, and the quality changes of blueberries were measured during storage. Then the four groups of blueberries were comprehensively evaluated by the principal component analysis method, to obtain the most accurate temperature control processing method. The results showed that the inner temperature of the icestorage boxes was lower, and the inner temperature of the phase temperature storage boxes fluctuated to a lesser extent than that of the control. On the 60th day of storage, the good fruit rate, soft fruit rate, flavor index and fruit frost coverage index of blueberries of the phase temperature group were 79.54%, 17.87%, 72.22%, 76.00%, respectively, with their color changes less than 2, and their L values as 27.03. In addition, blueberries stored by the precision temperature control had higher hardness, and lower consumption rates for nutrients such as soluble solids, titratable acid, Vc and anthocyanins. Among which, the Vc content of blueberries of the CK group decreased by 5.01, 9.18 and 16.67 mg/100 g, respectively, compared with those of the ice temperature group 1, ice temperature group 2 and phase temperature group. After principal component analysis, the quality ranking of the four groups of blueberries was: phase temperature group> ice temperature group 2> ice temperature group 1> CK group. Moreover, the relative contents of the desirable aroma components (such as aldehydes, terpenoids and esters) of the blueberries stored by precision temperature control were higher. Therefore, precision temperature control technology is beneficial to the cold preservation of blueberries, with the effect of the phase temperature storage being better.
