期刊
FOOD RESEARCH INTERNATIONAL
卷 159, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.foodres.2022.111620
关键词
Spirulina platensis; Chlorella vulgaris; Scenedesmus quadricauda; Lagerheimia longiseta; Cryoprotectant; Storage stability; Simulated gastrointestinal conditions
资金
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES -Brazil Finance) [001]
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico [402745/2021-3]
This study evaluated the potential of microalgae (Spirulina platensis, Chlorella vulgaris, Scenedesmus quadricauda, and Lagerheimia longiseta) as protective agents for probiotic cultures during freeze-drying, refrigeration storage, and simulated gastrointestinal conditions. The results demonstrated that microalgae biomass can provide effective protection for probiotics, potentially outperforming conventional cryoprotectants such as fructooligosaccharides.
This study aimed to assess Spirulina platensis, Chlorella vulgaris, Scenedesmus quadricauda, and Lagerheimia longiseta microalgae potential as protective agents for probiotic cultures [(Lactobacillus acidophilus (La-05) and Lacticaseibacillus casei (Lc-01)] during freeze-drying, refrigeration storage (4 degrees C, 120 days), and in vitro simulated gastrointestinal conditions (SGIC). The occurrence of membrane damage and ultrastructural aspects of the cells were also verified. Fructooligosaccharides (FOS) were used as a positive control and saline solution as a negative control. The effects of the cryoprotectants on probiotic survival depended on the tested probiotic culture and microalgae biomass. For La-05, all tested cryoprotectants caused a lower reduction in probiotic counts during the freeze-drying and up to 90 days of storage. S. platensis kept higher probiotic counts during storage, while C. vulgaris protected the probiotic against the SGIC. L. longiseta decreased the probiotic membrane damage, mainly due to the production of exopolysaccharides, which was observed in the scanning electron microscopy (SEM). For Lc-01, all tested cryoprotectants promoted a lower reduction in probiotic counts up to 120 days of storage. FOS and S. quadricauda protected the probiotics during freeze-drying and refrigeration storage, while C. vulgaris protected the probiotic against the SGIC and caused lower membrane damage, mainly due to physical protection observed in SEM. In conclusion, microalgae biomasses exerted similar or better cryoprotectant effects on probiotics than FOS, a recognized cryoprotective agent.
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