The effect of prebiotics on production of antimicrobial compounds, resistance to growth at low pH and in the presence of bile, and adhesion of probiotic cells to intestinal mucus.
OBJECTIVE
Screening of five bile salt-resistant and low pH-tolerant lactic acid bacteria for inhibitory activity against lactic acid bacteria and bacterial strains isolated from the faeces of children with HIV/AIDS. Determining the effect of prebiotics and soy milk-base on cell viability and adhesion of cells to intestinal mucus.


RESULTS
Lactobacillus plantarum 423, Lactobacillus casei LHS, Lactobacillus salivarius 241, Lactobacillus curvatus DF 38 and Pediococcus pentosaceus 34 produced the highest level of antimicrobial activity (12,800 AU ml(-1)) when grown in MRS broth supplemented with 2% (m/v) dextrose. Growth in the presence of Raftilose Synergy1, Raftilose L95 and Raftiline GR did not lead to increased levels of antimicrobial activity. Cells grown in the presence of Raftilose Synergy1 took longer to adhere to intestinal mucus, whilst cells grown in the absence of prebiotics showed a linear rate of binding.


CONCLUSIONS
A broad range of gram-positive and gram-negative bacteria were inhibited. Dextrose stimulated the production of antimicrobial compounds. Adhesion to intestinal mucus did not increase with the addition of prebiotics.


CONCLUSIONS
The strains may be incorporated in food supplements for HIV/AIDS patients suffering from gastro-intestinal disorders.
Department of Physiological Sciences, University of Stellenbosch, Stellenbosch, South Africa.
M
M
Brink
S D
SD
Todorov
J H
JH
Martin
M
M
Senekal
L M T
LM
Dicks
D000900:Anti-Bacterial Agents / Q000096:biosynthesis*; D001422:Bacterial Adhesion / Q000502:physiology; D001646:Bile / Q000502:physiology; D002648:Child; D005243:Feces / Q000382:microbiology; D005516:Food Microbiology; D005612:Freeze Drying; D015658:HIV Infections / Q000382:microbiology; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007413:Intestinal Mucosa / Q000382:microbiology; D007778:Lactobacillus / Q000254:growth & development / Q000502:physiology*; D007780:Lacticaseibacillus casei / Q000502:physiology; D048191:Lactiplantibacillus plantarum / Q000502:physiology; D010376:Pediococcus / Q000502:physiology; D019936:Probiotics / Q000494:pharmacology*; D041942:Soy Milk
D000900:Anti-Bacterial Agents