Fast measuring device and method for molecular weight of chitosan

Abstract

The invention discloses a fast measuring device and a method for the molecular weight of chitosan. The device comprises a thermostatic bath and a liquid storage tank arranged inside the thermostatic bath. The device is characterized in that the device further comprises a singlechip microcomputer. The liquid storage tank comprises an upper chamber and a lower chamber which are communicated with each other through a level valve, wherein the lower chamber is internally provided with a vent pipe communicated with the outside atmosphere, and the lower portion or the bottom of the lower chamber is provided with a capillary tube which is used for transferring liquid to the outside of the thermostatic bath; the tip of the capillary tube is a horn mouth, and the lower portion of a weighing cup mounted right under the horn mouth is provided with a gravity sensor; a valve (17) is mounted on the capillary tube, and a gravity signal obtained by the gravity sensor is transferred to the singlechip microcomputer. By means of the existing viscosity method, a chitosan molecular weight-measuring device has the disadvantages of being complex in structure, low in precision, inconvenient to operate, hard to maintain, likely to break down and the like. According to the fast measuring device and the method for the molecular weight of chitosan, weights rather than volume scales are utilized to quantify and measure the time spent in passing the capillary tube; therefore, the fast measuring device has the advantages of being simple in structure, high in precision, convenient to operate, easy to maintain, not likely to break down and the like.

Description

technical field [0001] The invention belongs to the technical field of chemical product detection equipment, in particular to a method and device for measuring the molecular weight of chitosan. Background technique [0002] Chitosan is a renewable and easily biodegradable amino polysaccharide in nature, widely used in medicine, chemical industry, food, cosmetics, agriculture, environmental protection and other fields. Chitosan is a natural polymer material, its quality and application are related to molecular weight, so the determination of chitosan molecular weight has become a very important basic work for chitosan research. [0003] There are many methods for the determination of molecular weight, but the most widely used method is the viscosity method. Conventional viscosity method (also known as extrapolation method) to measure the molecular weight of chitosan has simple equipment and is most widely used in production and scientific research. [0004] The measurement ...

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Problems solved by technology

[0013] 1. Manually judge line a, line b and manually press the stopwatch. Since human errors are prone to occur, each measurement must be measured twice to compare the countdown. If the error exceeds 0.1 second, it must be re-measured

[0014] 2. To measure 5 solutions with different concentrations, the operation is cumbersome

[0015] 3. When changing liquids of different concentrations, it is very inconvenient to clean the capillary, and it is easy to damage the glass tube, causing a lot of inconvenience to the work

[0016] 4. The temperature control during measurement is inconvenient. The measurement environment requires constant temperature measurement only when it is lower than the preset temperature of the measurement. When the temperature is higher than the temperature, it cannot be lowered.

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