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Ling JG, Xuan XT, Yu N, Cui Y, Shang HT, Liao XJ, Lin XD, Yu JF, Liu DH. High pressure-assisted vacuum-freeze drying: A novel, efficient way to accelerate moisture migration in shrimp processing. J Food Sci 2020; 85:1167-1176. [PMID: 32275070 DOI: 10.1111/1750-3841.15027] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2019] [Revised: 11/29/2019] [Accepted: 12/03/2019] [Indexed: 11/28/2022]
Abstract
High pressure processing (HPP), as nonthermal processing technology, has the potential to increase the drying rate due to its improvement of heat and mass exchange in different processes. In this study, the moisture migration in shrimps during HPP-vacuum-freeze drying (HPP-VFD) processes has been monitored by using low-field nuclear magnetic resonance and magnetic resonance image (MRI) in comparison with hot air-drying and VFD. Based on the T2 relaxation spectra, three water fractions corresponding to bound water (hydrogen-bonded water), immobile water (water trapped by organization structure or cell member), and free water were observed. For group B, with increasing drying time (4 to 22 hr), the transverse relaxation times of T21 , T22 , and T23 were significantly decreased (76.79%, 57.78%, and 40.9%) (P < 0.05). The content of immobile water (A22 ) and free water (A23 ) decreased (81.55% and 89.07%), whereas the bound water (A21 ) increased (7.26%). In comparison with group B, the T21 , T22 , and T23 of group C showed greater decrease (83.12%, 87.12%, and 89.57% for group C) so that HPP pretreatment could shorten the relaxation time. MRI analysis further proved that HPP-VFD drying has improved drying efficiency, and moisture migration was from the exterior to the interior part with increasing drying time. SEM analysis demonstrated that no significant damage of muscle fibers with narrower gaps was observed for groups B and C. Overall, HPP, as a pretreatment technology, could accelerate the moisture migration and improve the drying efficiency of VFD process for shrimp. PRACTICAL APPLICATION: High pressure processing (HPP) is now well known as a nonthermal processing technology and becoming increasingly acknowledged. However, there is limited information about its application in shrimp-drying process and the moisture dynamic of shrimp subjected to high pressure processing-assisted vacuum-freeze drying. This study could provide valuable information regarding the moisture status and migration in HPP-VFD shrimp monitored by LF-NMR and MRI methods. The results showed that HPP processing at 550 MPa for 10 min can be used as an interesting method for drying pretreatment, increasing its drying rate and consequently reducing its process time, and it demonstrated that the methods used in this study had good correlation coefficient with physicochemical properties of shrimp, which may be real-time and nondestructive monitoring methods for shrimp-drying process.
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Affiliation(s)
- Jian-Gang Ling
- College of Biosystems Engineering and Food Science, Natl.-Local Joint Engineering Laboratory of Intelligent Food Technology and Equipment, Zhejiang Univ., Hangzhou, 310058, China.,Inst. of Agricultural Products Processing, Key Laboratory of Preservation Engineering of Agricultural Products, Ningbo Academy of Agricultural Sciences, Ningbo, Zhejiang, 315040, China
| | - Xiao-Ting Xuan
- Inst. of Agricultural Products Processing, Key Laboratory of Preservation Engineering of Agricultural Products, Ningbo Academy of Agricultural Sciences, Ningbo, Zhejiang, 315040, China
| | - Ning Yu
- Key Laboratory of Healthy & Intelligent Kitchen System Integration, Ningbo Fotile Kitchen Ware Co., Ltd., Ningbo, 315336, PR China
| | - Yan Cui
- Inst. of Agricultural Products Processing, Key Laboratory of Preservation Engineering of Agricultural Products, Ningbo Academy of Agricultural Sciences, Ningbo, Zhejiang, 315040, China
| | - Hai-Tao Shang
- Inst. of Agricultural Products Processing, Key Laboratory of Preservation Engineering of Agricultural Products, Ningbo Academy of Agricultural Sciences, Ningbo, Zhejiang, 315040, China
| | - Xiao-Jun Liao
- College of Food Science and Nutritional Engineering, China Agricultural Univ., Beijing, 100083, China
| | - Xu-Dong Lin
- Inst. of Agricultural Products Processing, Key Laboratory of Preservation Engineering of Agricultural Products, Ningbo Academy of Agricultural Sciences, Ningbo, Zhejiang, 315040, China
| | - Jing-Feng Yu
- Inst. of Agricultural Products Processing, Key Laboratory of Preservation Engineering of Agricultural Products, Ningbo Academy of Agricultural Sciences, Ningbo, Zhejiang, 315040, China
| | - Dong-Hong Liu
- College of Biosystems Engineering and Food Science, Natl.-Local Joint Engineering Laboratory of Intelligent Food Technology and Equipment, Zhejiang Univ., Hangzhou, 310058, China.,Inst. of Agricultural Products Processing, Key Laboratory of Preservation Engineering of Agricultural Products, Ningbo Academy of Agricultural Sciences, Ningbo, Zhejiang, 315040, China
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