Some materials are used for the encapsulation of probiotics.
Component | Advantage | Disadvantage | Probiotic | Therapeutic effect of strain(s) | Reference |
---|---|---|---|---|---|
Proteins | |||||
Milk proteins (whey protein and/or casein) | Acid-stable; pepsin-resistant; bile salt-resistant; enzyme-activated controlled release in intestine; exceptional film-forming properties | Potential allergen | Lactobacillus rhamnosus GG, Bifidobacterium longum 1941, Lactobacillus delbrueckii ssp. bulgaricus, Streptococcus thermophilus | Preventing diarrhoea, primary rotavirus infection, and atopic dermatitis | [40–42] |
Plant proteins [zein (corn protein) and/or soy protein] | Enhanced protection due to forming a hydrophobic shell; pH and thermal stability | Might aggregate and compromise stability | Bacillus subtilis 168 | Increasing abundance of beneficial gut bacteria | [43, 44] |
Gelatin | Improved antioxidant property; mucoadhesion can potentially enhance probiotic delivery | Denatures at high temperatures | Lactobacillus rhamnosus GGBifidobacterium bifidumLactobacillus acidophilusBacillus coagulansSaccharomyces boulardii | Gut disease prevention, such as IBS, IBD, diarrhea prevention.Improving immune modulation, such as allergy, inflammation.Vaginal or urinary tract infection improved by Lactobacillus strain | [45] |
Albumin (egg white protein) | Gelling and cross-linking ability; specific site-targeting properties | Potential allergen; pH sensitive | Lactobacillus acidophilus TISTR 1338 | Preventing diarrhoea, treating Helicobacter pylori, improving respiratory tract infections, lowering serum cholesterol levels and improving the host’s lactose tolerance levels | [46, 47] |
Silk fibroin | Resistant to gastric acid and bile acid; resistant to enzymatic action; improved adhesion to IECs | Can be brittle | Lactobacillus plantarum, Enterococcus faecium KCTC 13115BP (EF-3), Streptococcus thermophilus KCTC 14471BP (ST-27), Bifidobacterium animalis subsp. lactis KCTC 13116BP (BL-5), Bifidobacterium bifidum KCTC 13114BP (BB-1), Lactobacillus acidophilus KCTC 13117BP (LA-7) | Reducing diarrhea, inhibiting pathogenic bacteria, reducing blood cholesterol, and improving liver cirrhosis and obesity | [48, 49] |
Polysaccharides | |||||
Alginate | High encapsulation efficiency; significant increase in the survival rate of probiotics; cost-effective | Reduced probiotic protection at low pH | Saccharomyces cerevisiae strains, Saccharomyces boulardii, Enterococcus faecium, Bacillus licheniformis, fruit-derived lactic acid bacteria (LAB) | Preventing and treating diarrheal diseases (acute infantile diarrhoea, antibiotic-associated diarrhoea, nosocomial infection); preventing systemic infection; managing IBD; immunomodulation; prevention and treatment of allergies; anticancer effects, treating high cholesterol, and relieving lactose intolerance | [50] |
Chitosan | The only commercially available water-soluble cationic polymer, quick biodegradation | Reported to have some antimicrobial and antifungal actions; therefore can be used as the shell but not the capsule during encapsulation strategies | Lactobacillus and Bifidobacterium spp. | Boosting host immunity; improving growth of targeted microorganisms; eliminating harmful bacteria | [51] |
Pectin | Itself a prebiotic, meaning it can be fermented by beneficial bacteria in the gut, further supporting their growth and activity; resistant to enzymatic digestion in the stomach and small intestine | Might modify probiotics’ metabolism | Lactobacillus plantarum | Protection against intestinal epithelial barrier disruption | [52, 53] |
Carrageenan | Improved probiotic survival in acidic conditions | No significant resistance to bile salts | Lactobacillus plantarum | Enhancing gut health by securing a good number of probiotic bacteria in the GI tract in highly acidic conditions | [54] |
Gellan and/or xanthan gum | Excellent gelling and malleability properties; biocompatible and biodegradable; heat and acid-stable | May be unstable in physiological conditions | Lactobacillus paracasei 28.4 | Antifungal activity against Candida albicans in the oral cavity | [55, 56] |
Cellulose | Cheap; can be used to make pH-responsive capsules when complexed with other materials | It can lead to structural defects when used in complexes | Lactobacillus spp., Bifidobacterium spp. | Treatment of severe skin infections and chronic wounds | [57] |
Starch and/or dextran | Acid-resistant | Can be unstable under thermal stress; can form irregular aggregates | Lactobacillus rhamnosus | Enhancing probiotic stability and viability under simulated gastrointestinal conditions | [58] |
Pullulan | Itself a potential prebiotic; increased probiotic viability after acid and bile exposure | Can be expensive | Lactobacillus acidophilus NRRL-B 4495 | Preventing and treating gastrointestinal infections and diarrhoea; stimulating immune responses that promote the effects of vaccination or even prevent certain allergic symptoms | [59, 60] |
Lipids | |||||
Plant oils (olive, sunflower, soybean, corn) | Improved survival in gastric and pancreatic juices | May interfere with probiotic survivability | Candida adriatica, Candida diddensiae, Nakazawaea molendini-olei, Nakazawaea wickerhamii, Wickerhamomyces anomalus, Yamadazyma terventina | Synthesizing polyunsaturated fatty acids (PUFAs), which provide health benefits | [61] |
Dioleoylphosphatidic acid and cholesterol | Preserves the native viability and biosafety of naked probiotics | Might induce an inflammatory response | Escherichia coli Nissle 1917 (EcN) | Preventing and treating Salmonella typhimurium (STm) and dextran sulfate sodium (DSS) induced colitis | [62] |
IBD: inflammatory bowel disease; IBS: irritable bowel syndrome; IECs: intestinal epithelial cells.
The authors are thankful to the Department of Microbiology, Stamford University Bangladesh; Department of Computational Biology and AI, Aporesis, Wyoming, USA; Department of Microbiology, The University Texas Austin, Austin, Texas, USA; Department of Food Engineering and Tea Technology, Shahjalal University of Science and Technology, Sylhet, Bangladesh; Department of Microbiology, Brac University, Dhaka, Bangladesh; Department of Microbiology, Noakhali Science and Technology University, Bangladesh for giving support by sharing knowledge throughout this article writing and publishing.
STA: Conceptualization, Writing—original draft, Writing—review & editing, Formal analysis, Project administration, Supervision. ABHR: Conceptualization, Writing—original draft, Writing—review & editing, Formal analysis, Project administration. MUA: Conceptualization. MTK: Writing—original draft. JFJ: Data curation. MMI: Writing—original draft. MARR: Conceptualization. MAU: Conceptualization, Writing—review & editing. All authors read and approved the submitted version.
The authors declare that they have no conflicts of interest.
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