A comparative study between freeze-dried and spray-dried goat milk on lipid profiling and digestibility

[Display omitted] •Goat milk fat globules were subjected to simulated in-vitro infant digestion.•A total of 359 triacylglycerols and 189 phospholipids were identified by using high-resolution tandem mass spectrometry.•Lyso-phospholipids and some important long-chain polyunsaturated TAGs were better...

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Published in:Food chemistry 2022-09, Vol.387, p.132844-132844, Article 132844
Main Authors: Zhang, Yan, Zheng, Zhaojun, Liu, Chunhuan, Tan, Chin-ping, Xie, Kui, Liu, Yuanfa
Format: Article
Language:English
Subjects:
Animals
Freeze Drying
Goat milk
Goats
Humans
Lipid digestibility
Lipid profiling
Lipolysis
Milk
Phospholipids
Spray drying
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Summary:[Display omitted] •Goat milk fat globules were subjected to simulated in-vitro infant digestion.•A total of 359 triacylglycerols and 189 phospholipids were identified by using high-resolution tandem mass spectrometry.•Lyso-phospholipids and some important long-chain polyunsaturated TAGs were better preserved in freeze-dried goat milk than spray-dried goat milk.•Freeze-dried goat milk fat had longer lag period during digestion and lower level of final lipolysis than spray-dried goat milk. Different drying techniques impart distinguishing characteristics to goat milk, particularly to its fat globules. Here, we investigated the difference between freeze-dried and spray-dried goat milk (FGM and SGM) fat globules on lipid profiling and in vitro infant gastrointestinal digestibility. The former presented higher levels of MUFA (31.76%) and lower cholesterol content (1.20 ± 0.02 mg/g). Some important long-chain polyunsaturated triacylglycerols such as POL (16:0/18:1/18:2), PSL (16:0/18:0/18:2), and POO (16:0/18:1/18:1), also had better preservation in FGM. Moreover, we detected more species of lysophospholipid in FGM than SGM, accounting for 2.51% and 0.71% of total phospholipids, respectively. More intriguingly, FGM, which has better membrane integrity and larger particle size, showed longer lag during gastric digestion and lower level of final lipolysis throughout gastrointestinal digestion. Therefore, our results showed the effects of different drying techniques on lipid profiling and digestibility of goat milk, providing significant insight for appropriate utilization of goat milk in infant nutrition.
ISSN:0308-8146
1873-7072
DOI:10.1016/j.foodchem.2022.132844