Effects of Intermittent Liquid Nitrogen Immersion Freezing on the Freezing-cracking Rate and Sensory Quality of Dumplings

LEI Mengmeng; AI Zhilu; PAN Zhongshan; PAN Zhili; JIA Ruonan; HUANG Zhongmin

doi:10.13386/j.issn1002-0306.2020020119

Volume 42 Issue 3

Jan. 2021

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Science and Technology of Food Industry > 2021 > 42(3): 25-30. > DOI: 10.13386/j.issn1002-0306.2020020119

LEI Mengmeng, AI Zhilu, PAN Zhongshan, PAN Zhili, JIA Ruonan, HUANG Zhongmin. Effects of Intermittent Liquid Nitrogen Immersion Freezing on the Freezing-cracking Rate and Sensory Quality of Dumplings[J]. Science and Technology of Food Industry, 2021, 42(3): 25-30. DOI: 10.13386/j.issn1002-0306.2020020119

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Effects of Intermittent Liquid Nitrogen Immersion Freezing on the Freezing-cracking Rate and Sensory Quality of Dumplings

LEI Mengmeng^1,2,3,4,
AI Zhilu^1,2,3,4,
PAN Zhongshan¹,
PAN Zhili^1,2,3,4,
JIA Ruonan^1,2,3,4,
HUANG Zhongmin^1,2,3,4, ,

1. College of Food Science and Technology, Henan Agricultural University, Zhengzhou 450002, China;
2. National R&D Center For Frozen Rice & Wheat Products Processing Technology, Zhengzhou 450002, China;
3. Key Laboratory of Bulk Grain Processing, Ministry of Agriculture, Zhengzhou 450002, China;
4. Henan Cold Chain Food Engineering Technology Research Center, Zhengzhou 450002, China

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Received Date: February 11, 2020
Available Online: February 02, 2021

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Abstract

To explore the effect of intermittent liquid nitrogen immersion freezing on the color difference,texture,sensory quality and microstructure of dumplings,in this paper the effect of liquid nitrogen immersion time,interval time and immersion times on dumplings with the index of freezing-cracking rate were studied. The effect of liquid nitrogen immersion freezing on the color,texture,sensory properties and microstructure of dumplings compared with the cryogenic refrigerator freezing and spiral tunnel freezing was studied by means of color difference meter,texture meter and scanning electron microscope. The results showed that when the single immersion time of liquid nitrogen was 2 s,the interval time was 10 s and the total immersion time was 86 s,the time was the shortest and the central temperature reached below-18 ℃ and the freeze-crack rate of dumplings was 0. Compared with the traditional cryogenic refrigerator freezing and spiral tunnel freezing,the L^* of dumplings increased significantly after the immersion freezing with liquid nitrogen(P<0.05),the color and appearance were significantly improved,and the hardness,adhesion and chewability significantly reduced(P<0.05). The taste was more similar to the quality of fresh untreated dumplings. The SEM results showed that the number of pores in the dumpling skin was the smallest and the most in the liquid nitrogen freezing treatment group,and the excessive holes might damage the gluten network structure,resulting in poor boiling resistance of dumplings. This study provides a certain theoretical basis and technical support for the application of liquid nitrogen freezing in rice noodle products.
- liquid nitrogen intermittent freezing,
- freezing crack,
- dumplings,
- quality,
- microstructure

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Effects of Intermittent Liquid Nitrogen Immersion Freezing on the Freezing-cracking Rate and Sensory Quality of Dumplings

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