Encapsulation of Lactobacillus acidophilus NCDC 016 cells by spray drying: characterization, survival after in vitro digestion, and storage stability

In the present study, probiotic cells (Lactobacillus acidophilus) were encapsulated by spray drying technology to produce a probiotic powder using 20% maltodextrin and varied concentrations of gum arabic. The effects of processing conditions such as inlet air temperature (130-150 °C) and gum arabic...

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Bibliographic Details
Published in:Food & function 2020-10, Vol.11 (10), p.8694-8706
Main Authors: Arepally, Divyasree, Reddy, Ravula Sudharshan, Goswami, Tridib Kumar
Format: Article
Language:English
Subjects:
Air temperature
Capsules
Digestion
Drying
Encapsulation
Fourier transforms
Gum Arabic - chemistry
Hygroscopicity
Lactobacilli
Lactobacillus acidophilus
Lactobacillus acidophilus - physiology
Maltodextrin
Microbial Viability
Moisture content
Morphology
Physical properties
Polysaccharides - chemistry
Powders
Probiotics
Room temperature
Shelf life
Spectroscopy, Fourier Transform Infrared
Spray Drying
Storage stability
Structural stability
Temperature
Water activity
Water content
Wettability
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Summary:In the present study, probiotic cells (Lactobacillus acidophilus) were encapsulated by spray drying technology to produce a probiotic powder using 20% maltodextrin and varied concentrations of gum arabic. The effects of processing conditions such as inlet air temperature (130-150 °C) and gum arabic concentration (0-10%) on the encapsulation efficiency, physical properties, and morphology were studied. For all the tested formulae, the moisture content, water activity, encapsulation efficiency, hygroscopicity, and wettability obtained were in the range of 4.59-9.05% (w.b.), 0.33-0.52, 65-89.15%, 12 to 21.15 g H2O per 100 g dry weight, and 116 s to 353 s, respectively. The Fourier transform infrared (FTIR) results have shown that gum arabic and maltodextrin show structural stability during spray drying. The encapsulated probiotic cells exhibited better viability of 4.03, 4.68, and 5.34 log CFU g-1 after 3 h of exposure to a simulated gastric fluid (SGF) solution at pH levels of 1, 1.5, and 2, respectively, compared to free cells. The viability of encapsulated cells stored for 12 weeks under refrigerated conditions (4 °C) and at room temperature (25 °C) was found to be 6.05 log CFU g-1 and 1.24 log CFU g-1, respectively.
ISSN:2042-6496
2042-650X
DOI:10.1039/d0fo01394c