Lotus filling is one of the most common fillings in the moon cake processing industry. Whether it is Cantonese-style moon cakes, Beijing-style moon cakes or Soviet-style moon cakes, there are many varieties with lotus root as the main filling. According to the requirements of the national standard GB19855-2005 on moon cakes officially implemented on September 2, 2006, which was officially implemented on June 2, 2006, the method for detecting the moisture content of lotus fillings during the processing of moon cakes was lightly described. And the use of the MF-50 rapid moisture analyzer in the rapid method.
Lotus filling is one of the high-sugar and high-fat fillings. In the rapid moisture measurement method, if the selected temperature is too low, the whole measurement time will be lengthened. If the temperature is too high, the coking and sugar and fat will be Evaporate and get too high data. The repeatability is not ideal and the actual moisture content is not obtained.
One: direct drying method
1.1 Principle:
The sample was dried in an oven at 105 ± 2 ° C under atmospheric pressure until constant weight, and the lost weight was moisture.
1.2 Instrument and equipment:
1.2.1 Analytical balance: Sensitivity 0.0001g (eg HR-200GR-200)
1.2.2 Electrothermal constant temperature drying oven; the temperature can be controlled at 105±2°C.
1.2.3 sample dish: glass or aluminum.
1.2.4 Dryer: Use calcium chloride or color changing silica as a desiccant.
1.3 Measurement steps:
The sample was cleaned and baked in an oven at 105 ± 2 ° C for 1 hour, taken out, and cooled in a desiccator for 30 minutes. After constant weight, weigh on an analytical balance and record the constant weight of each sample. 5-10 g of lotus seed samples were placed in a sample dish, and the weighing results were recorded. Do not cover the sample cover, and dry it in a constant temperature dry bath at 105±2°C for 3-5 hours. Remove, cover the sample cover, place it in a desiccator for 30 minutes, weigh it, and record. Then, it was placed in a constant temperature drying oven for 1 hour, cooled, and weighed. And record. Confirm the sample constant weight.
1.4 Calculation of measurement results
1.4.1 Calculation formula: moisture (%) = {(w1-W2) / (w1-w0)} X100
In the formula: W1 - the weight of the lotus seed sample before drying and weighing the sample, G.
W2——Lianrong is dried at 105±2°C in a constant temperature drying oven and weighed the constant weight of the sample dish, G.
W0 - the weight of the sample weighing constant weight.
Two: Using the MF-50 Moisture Analyzer for rapid measurement.
2.1 At atmospheric pressure, use a halogen heater to heat and dry until constant weight. The lost weight is moisture, and the moisture content is directly displayed on the instrument.
2.2MF-50 related technical parameters; weighing range: 51g
Weighing accuracy: 2mg moisture accuracy 0.05%
2.3 Parameter setting of moisture measurement of lotus filling material: mode: adopt automatic mode (UA)
Pre-set limit value (stop probability): 0.10% or 0.20%.
Drying procedure: using a step drying method. The details are as follows: the temperature is set to 160 ° C in the first 2-3 minutes; the second temperature range is 115-120 ° C.
The sampling amount of lotus seed: between 2-3g.
The entire measurement time is: within 10 minutes.
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