Example of using a desktop spectrophotometer HPC-821N for detecting milk chromaticity

In the milk industry, the color of milk is an important quality indicator, which reflects the composition, freshness, and processing process of milk, and is of great significance for evaluating the quality and safety of milk. For example, excessive heat treatment or oxidation may cause milk to turn yellow, which is usually unpopular. Therefore, strict quality control of milk color is necessary to ensure that it meets relevant standards and regulations. However, traditional color evaluation methods may be subject to significant biases due to human factors, environmental light, or subjective observation. However, desktop spectrophotometers convert the spectral distribution of sample reflection or transmission into objective color parameters, such as Lab values, which can accurately quantify color differences. This article will introduce a method of measuring milk chromaticity differences using a desktop spectrophotometer.

Working principle of desktop spectrophotometer

A desktop spectrophotometer is an instrument that evaluates color by measuring the reflected or transmitted light of an object's color. It decomposes the light reflected by an object into monochromatic light of different wavelengths and measures the intensity of light at each wavelength. The desktop spectrophotometer can calculate the color difference between the object color and the target color by measuring them, and then judge the quality of milk.

Measurement steps

1、 Prepare materials

(1) Color spectrum desktop spectrophotometer HPC-821N

(2) Standard milk sample

(3) Sample of milk to be tested

(4) Colorimetric dish

Among them, the desktop spectrophotometer HPC-821N is the main instrument used to measure the chromaticity of milk, and the circular colorimetric dish is an instrument used to hold milk samples.

2、 Sample preparation

Pour the milk into a colorimetric dish (ensure that the milk is poured into at least 3/4 of the volume of the colorimetric dish)

3、 Sample measurement

(1) Turn on the desktop spectrophotometer HPC-821N

(2) Set parameters: Select reflection measurement mode, D65 light source, 10 ° observer angle, etc

(3) Perform black and white calibration in reflection measurement mode

(4) Stand HPC-821N upright and measure upwards with the testing port

(5) Place the colorimetric dish that has been poured into the standard milk sample on the testing port, ensuring that it completely covers the testing port

(6) Press the measurement button and wait for the instrument to complete the measurement and display the result.

(7) Record measurement results

(8) Clean the colorimetric dish and instrument, and prepare for the next measurement

4、 Result analysis

This experiment can evaluate the color difference of the test sample by comparing the color difference value between the test sample and the standard sample. This method can help milk producers ensure product quality and improve consumer experience.

Meanwhile, in the new product development phase, color adjustment and optimization are crucial steps. By using a desktop spectrophotometer, researchers can accurately measure and adjust the color of new products to meet market and consumer expectations.