Effects of Different Freezing Methods on the Freezing Characteristics and Quality of Mango Chunks
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Abstract:
Compared with liquid nitrogen spray freezing (LNF-40~-100 ℃), refrigerator freezing (RF-20 ℃), and Normal immersion freezing (IF-20 ℃), the mango chunks were investigated. Freezing characteristics and quality changes. The results show that the glass transition temperature of mango is -17.98 ℃, the exothermic enthalpy △H=-236.8 J/g; The freezing rate (r) and the energy removal rate (Q) are 0.14~1.40 ℃/min, 17.35~161.45 J/min, the freezing rate and the energy removal rate of LNF-100 ℃ were increased by 900%~7.63% and 830.54%~13.45% respectively compared with other groups; Compared with the RF-20 ℃ and IF-20 ℃ groups, the total freezing time and the time of passing through the maximum ice crystal formation zone were shortened by 9042 s, 4657 s, 5475 s, and 870 s, The color was also close to that of fresh mango; The hardness retention rate was 83.12%; Water loss was 2.75%; Total phenol, antioxidant activity and Vc retention rate reached more than 90%; Polysaccharide increased by 0.44 mg/g; The total number of colonies before and after freezing decreased by 0.84 lg CFU/g; Pearson analyzed the effect of different freezing methods on the quality of mango blocks, △E, Water loss, total phenolics, and Vc can be used as the basis for effective evaluation; Cluster analysis (CA) confirmed that LNF-100 ℃ can significantly reduce the quality of mango chunks during freezing deterioration. This study provides theoretical basis and technical guidance for the development of high-quality and high-efficiency frozen mangoes.
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Project Supported:
Guangdong Basic and Applied Basic Research Fund Project (2019A1515110559), Guangdong Academy of Agricultural Sciences "14th Five-Year Plan" Agricultural Advantageous Industry Discipline Team (202109TD); Guangzhou Young Science and Technology Talent Support Project (QT20220101055); Guangdong Agricultural Science and Technology Development and Resource Environmental Protection Management Project (2022KJ108); Guangdong Academy of Agricultural Sciences Development and Resource Environmental Protection Management Project of Guangdong Province (2022KJ108); Science and Technology Talent Introduction Special Fund Project of Guangdong Academy of Agricultural Sciences (R2020YJ-YB2001); Youth Mentorship Project of Guangdong Academy of Agricultural Sciences (R2020QD-031); Innovation Team Construction Project for R&D of Common Key Technologies in Modern Agricultural Industries of Guangdong Province (2022KJ117)