Cherry tomato freezing point determination method

Abstract

The invention discloses a cherry tomato freezing point determination method. According to the invention, high-grade cherry tomatoes are purchased, selected, and grouped; geometrical centers of the cherry tomatoes are determined; temperature thermocouples are scaled; the thermocouples are arranged at the geometrical centers; a thermocouple Fluke-NetDAQ32 data acquisition apparatus is connected with a computer; the computer and the thermocouple Fluke-NetDAQ32 data acquisition apparatus are started; the cherry tomatoes with the fixed thermocouples are positioned in a freezing compartment of a refrigerator; temperature variations are recorded every 0.5 to 1s; when the temperatures of the thermocouples are -5 to -10 DEG C, temperature measuring is stopped; a cooling curve is drawn according to the acquired temperature data, such that freezing points are determined; abnormal points are pointed out, the freezing point of the cherry tomatoes is calculated according to an arithmetic average method, and a freezing temperature range is determined. The method provided by the invention is advantaged in simple operation, convenient operation, high speed, and relatively high accuracy.

Description

technical field [0001] The invention relates to the field of ice temperature preservation of fruits, in particular to ice temperature preservation of cherry tomatoes, and is a method for measuring the freezing point of cherry tomatoes. Background technique [0002] Cherry Tomato, also known as cherry tomato, belongs to the perennial herbaceous plant of Solanaceae Tomato. Its fruit is mostly heart-shaped, crystal clear and rich in nutrition. However, after harvesting, the cherry tomatoes have a short storage life at room temperature and are not easy to keep fresh. After a few days, the fruit loses water and shrinks, causing browning and causing rot. [0003] At present, most fruits in China adopt the method of low-temperature preservation, while in foreign countries, ice-temperature technology has already covered a wide range of agricultural products. Ice temperature refers to the temperature zone between below 0°C and the freezing point (freezing point) of cherry tomatoes, ...

AI Technical Summary

Problems solved by technology

[0004] At present, the domestic existing food material freezing point determination technology mainly includes temperature measurement method, freezing point measuring instrument method, etc., but these two methods have certain limitations. The former freezing point temperature is difficult to grasp, and the latter is mainly used in industrial fields. There are many liquid measurements, and it is mainly used in the freezing point determination of milk liquids in food

[0005] For fruit, the fruit freezing point measuring method of document record at present is known ice-salt water bath measuring method, and the freezing point that this method measures is the freezing point temperature of fruit juice after squeezing the fruit juice, and there is certain difference with the freezing point temperature of fruit, usually the fruit living tissue The freezing point temperature is lower than the freezing point temperature of its juice, so there is a certain measurement error in the traditional ice-salt water bath method