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A method for characterizing the drying end point of far-infrared dried Agaricus bisporus based on moisture distribution

A technology of far-infrared drying and Agaricus bisporus, which is used in the analysis of materials, water resources assessment, and analysis by nuclear magnetic resonance, etc., can solve problems such as derivation of tedious steps and correction of working functions, and achieves saving raw materials, high accuracy, and penetrating ability. strong effect

Active Publication Date: 2018-05-08
JIANGSU ACAD OF AGRI SCI
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Problems solved by technology

Liang Guohai et al. (2014) established a working function for detecting the moisture content of cut tobacco samples by low-field nuclear magnetic resonance technology. Compared with the results of the oven method, the moisture content determined based on the function has better precision, repeatability and stability. More tedious steps to derive and correct the work function

Method used

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  • A method for characterizing the drying end point of far-infrared dried Agaricus bisporus based on moisture distribution
  • A method for characterizing the drying end point of far-infrared dried Agaricus bisporus based on moisture distribution
  • A method for characterizing the drying end point of far-infrared dried Agaricus bisporus based on moisture distribution

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Embodiment

[0025] After cleaning and removing the stalk of Agaricus bisporus, cut it into thin slices of about 5mm along the growth direction, place it in the center of the radio frequency coil of the permanent magnetic field, and measure the transverse relaxation time T in the sample by using the CPMG pulse sequence 2 . The equipment parameters are set as follows: main frequency SF=23 (MHz), offset frequency Ol=425557.6Hz, hard pulse 90 degree pulse width P90=14(us), hard pulse 180 degree pulse width P180=30(us), spectrum width SW=200KHz, sampling points TD=828016, repeated scanning times NS=8, repeated sampling time TW=5000ms, echo number NECH=18000. Transverse relaxation time T using inversion software 2 value, such as figure 1 Shown, the transverse relaxation time of free water is 25 ~ 850ms. Then put the Agaricus bisporus slices into the far-infrared drying box for drying, the radiation distance is 150mm, and the radiation intensity is 2.1KW / m 2 . Scan the sample during the dry...

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Abstract

The invention relates to a method for representing a far infrared dried agaricus bisporus drying end point on the basis of moisture distribution, and belongs to the field of deep processing of agricultural products. The method comprises the steps that fresh agaricus bisporus slices are selected as raw materials, far infrared drying is performed, the agaricus bisporus slices in the drying process are scanned with a low field nuclear magnetic resonance technique to obtain a moisture distribution inversion chart, and the drying end point is determined according to the size of the free water relaxation area. When the free water relaxation area is zero, the drying process is finished. Compared with a traditional drying oven method for determining the drying end point by measuring the moisture content, the method has the advantages that operation is easy, convenient, visualized and accurate, the drying time is saved, and resource waste is avoided.

Description

technical field [0001] The invention relates to a method for characterizing the drying end point of far-infrared dried Agaricus bisporus based on moisture distribution, and belongs to the field of deep processing of agricultural products. Background technique [0002] Agaricus bisporus (Agaricus bisporus), also known as oyster mushroom and white mushroom, belongs to the genus Basidiomycetes. And export volume ranks first in the world. It is rich in nutrients such as protein, amino acid, multivitamins, ascorbic acid and vitamin D, and its nutritional value is 4-12 times that of vegetables and fruits. Fresh Agaricus bisporus is difficult to store after harvesting due to its high water content and delicate texture. Therefore, dehydration processing of Agaricus bisporus can effectively prolong its shelf life. At present, the production of dehydrated Agaricus bisporus products mainly adopts hot air drying, but the work efficiency is low, energy consumption is large, equipment ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N24/08
CPCG01N24/085Y02A90/30
Inventor 李大婧张钟元刘宗博刘春泉江宁魏秋羽
Owner JIANGSU ACAD OF AGRI SCI
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