Device and detection method for rapidly detecting oil yield of salted egg in nondestructive manner
A technology of non-destructive testing and detection methods, which is applied in the cross-application field of food science and electrical characteristics, can solve the problems of large consumption of reagents, unfavorable rapid detection, sample damage, etc., and achieve simple operation, fast non-destructive testing, and high accuracy Effect
Inactive Publication Date: 2014-07-23
JIANGNAN UNIV
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At present, the traditional method for detecting the oil yield of salted egg yolk is the Soxhlet extraction method, wh
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[0011] Example 1
[0012] Take 1 commercially available salted duck egg, place it in the middle of the left and right plates, and adjust the distance between the plates to 55mm. The plate is an epoxy resin plate plated with copper, with a size of 70mm×60mm×2mm, and connect it to the impedance analyzer ( British Wenke Electronics Co., Ltd., model 65120B), the frequency of the output signal is adjusted to 10kHz, the voltage amplitude is 280mV, and the measured impedance value is 88.55Ω. The oil yield of this salted egg is calculated by the following formula to be 16.57%.
[0013]
[0014] In order to verify its accuracy, the oil yield of salted egg yolk was detected by Soxhlet extraction method (refer to the national standard GB / T 5009.6-2003), and the value was 16.97%.
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The invention discloses a device and a detection method for rapidly detecting the oil yield of a salted egg in a nondestructive manner, and belongs to the technical field of cross application of food science and electrical properties. The device comprises an impedance analyzer, wherein two polar plates are connected to the impedance analyzer; the two polar plates are epoxy resin plates of which the surfaces are coated with copper, and are (70mm)*(60mm)*(2mm) in sizes; the distance between the two polar plates is 55mm. During working, the salted egg is placed into a parallel polar plate fixture and connected to the impedance analyzer, the distance between the polar plates is adjusted to 55mm, the salted egg is kept vertical, the impedance analyzer is started to keep the amplitude of an output alternating-current signal at 200-300mV and the frequency at 10-11kHz, and the oil yield of egg yolk can be obtained by detecting the value of impedance between the polar plates and calculating by adopting a conversion formula. Compared with the conventional Soxhlet extraction method for measuring the oil yield of the salted egg, the device and the method have the advantages of easiness and convenience in operation, no use of any chemical reagent, high accuracy and high repeatability.
Description
technical field [0001] The invention relates to a device for rapidly and non-destructively detecting the oil yield of salted eggs and a detection method thereof, which belong to the cross-application technical field of food science and electrical characteristics. Background technique [0002] Salted eggs are one of the traditional foods in China. The egg whites are tender and white, the egg butter is rosy, and the color is bright, which is very popular among consumers. Its salted egg yolk is rich in fatty acids, and can also provide a variety of vitamins and minerals. Because of its soft and loose sandy texture, high oil yield and delicious and unique taste, salted egg yolk is not only eaten directly, but also added as an auxiliary material for food processing into zongzi, moon cakes and other bakery products. During the pickling process of eggs, the penetration and dehydration of salt cause the protein and fat in the egg yolk to separate, and part of the fat is released, r...
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Inventor 杨哪马倩徐学明吴凤凤徐进陈海英金征宇焦爱权
Owner JIANGNAN UNIV
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