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PubMed1983

Development and differences of intestinal flora in the neonatal period in breast-fed and bottle-fed infants.

The development of stool bacterial flora was studied in breast-fed and bottle-fed infants. In both groups of infants, the intestine was first colonized with enterobacteria and their number attained 10(9) per gram of feces. On day 6, bifidobacteria were the predominant organisms in the stool of breast-fed infants, exceeding enterobacteria by a ratio of 1,000:1, whereas enterobacteria were the predominant organisms in formula-fed infants, exceeding bifidobacteria by approximately 10:1. At 1 month of age, bifidobacteria were the most prevalent organisms in both groups but the number of these organisms in the stool of bottle-fed infants was approximately one tenth that of breast-fed infants. The properties of breast milk that promote the growth of bifidobacteria and suppress the growth of coliform and other potentially pathogenic organisms, theoretically, would help to minimize the incidence of neonatal diseases caused by these organisms. The results would support the advantages of breast-feeding for optimal care of newborn infants.

Bottle Feeding↗
PubMed1983

Antimicrobial activity and physico-chemical properties of some alkyldimethylbenzylammonium chlorides.

A series of alkyldimethylbenzylammonium chlorides have been synthesized with n-alkyl chain lengths of C1 leads to C18. Octanol/water partition coefficients were determined and the antimicrobial activity assessed as the minimum growth inhibitory concentrations towards twelve strains of micro-organisms, representative of Gram-negative and Gram-positive bacteria, yeasts and fungi. The data were subjected to a numerical analysis. Antimicrobial activity of the compounds was found to be a parabolic function of their lipophilicity and maximized with n-alkyl chain lengths of between C12 and C16. The data fit to quadratic functions estimated for low (C1-C7) and high (C8-C16) alkyl chain length compounds was better than for a single quadratic describing the activity of the complete series (C1-C18). These maximized at log P values corresponding to alkyl-chain lengths of approximately C7 and C14 respectively, and were suggestive of low and high affinity binding sites upon the cell surface. The data analysis allowed the chain lengths of compounds with optimal activity towards the various groups of organisms to be determined. Generally yeasts and fungi were most sensitive towards C12, Gram-positive bacteria towards C14, and the Gram-negative bacteria towards C16. Gram-negative cells were the most resistant towards all the compounds and Gram-positive cells the least.

Bacteria↗