Cherry tomato freezing point determination method

A measurement method, the technology of cherry tomatoes, applied in the investigation phase/state change, etc., can solve problems such as measurement errors and freezing point temperature difficulties

Inactive Publication Date: 2012-03-28
SHANGHAI OCEAN UNIV
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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 poin

Method used

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Experimental program
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Embodiment Construction

[0043] In order to illustrate the content of the invention more clearly, the present invention will be described below in conjunction with the examples.

[0044] ① Turn on the refrigerator and keep the temperature stable at -18°C;

[0045] ② Purchasing cherry tomatoes from the market with plump, fresh, bright color, consistent maturity, no pests, no mechanical damage, no mildew, no freezing damage as experimental raw materials;

[0046] ③The cherry tomatoes are divided into 4 groups according to the size, each group has 9 pieces;

[0047] ④ Before the measurement, put the T-type thermocouple into the low-temperature constant temperature bath for calibration, and use the national second-level mercury thermometer to calibrate the thermocouple, and the temperature calibration range is -10 to 10°C;

[0048] ⑤Connect the thermocouple, data acquisition instrument Fluke-NetDAQ32 and the computer in order;

[0049] ⑥Take out 1 cherry tomato in each group, and use a vernier caliper a...

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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, ...

Claims

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Application Information

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IPC IPC(8): G01N25/04
Inventor 谢晶王金锋朱军伟汤毅
Owner SHANGHAI OCEAN UNIV
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