They produce phenyllactic acid
, which may inhibit growth of Aspergillus niger and Aspergillus flavus (Dalie et al., 2010).
 Indole-3-lactic acid and phenyllactic acid
may serve as robust noninvasive biomarkers for early stages of ALD.
It has been reported that the food preservation ability of LAB is due to the production of hydrogen peroxide, diacetyl, organic acids, carbon dioxide, ethanol, antifungal compounds such as phenyllactic acid
or fatty acids, bacteriocins and antibiotics such as Reutericyclin (Settanni and Corsetti, 2008).
Antifungal activity of phenyllactic acid
against molds isolated from bakery products.
The accumulation of phenyl-pyruvic acid also leads to formation and urinary excretion of Phenyllactic acid
, o-hydroxyphenylacetic acid, and phenylacetic acid, the last as phenylacetylglutamine (White et al., 1973).
Likewise, other previous reports with different types of organic acid indicated that the inclusion of organic acid such as 2% benzoic acid (Kluge et al., 2010) in the diet of lactating sows improved the digestibility of nutrients, 0.5% phenyllactic acid (Wang et al., 2009a) improved nutrient digestibility in weanling pig and trends of egg production in laying hens (Wang et al., 2009b) and Franco et al.
Effect of phenyllactic acid on growth performance, nutrient digestibility, microbial shedding and blood profiles in pigs.
Recently, 3-phenyllactic acid (Prema et al., 2010) and 4-hydroxy phenyllactic acid
Mu et al, (2010) have been described as substances with antifungal activity produced by lactobacilli.
Finally, hydroxyisovaleric did not appear; p-hydroxyphenyl pyruvic acid appeared at 5.47 min, xanthurenic acid at 5.98 min, phenyllactic acid at 7.09 min, and homogentisic at 11.88 min.
Pyruvic acid overlaps with phthalic, N-acetylaspartic, and glycolic acids; pyroglutamic acid overlaps with 3-hydroxybutyric acid; phenylpyruvic acid overlaps with orotic and hydroxyisovaleric acids; and p-hydroxyphenyl pyruvic and phenyllactic acids overlap with xanthurenic and homogentisic acids.
Effects of phenyllactic acid
on growth performance, nutrient digestibility, microbial shedding, and blood profile in pigs.
(1966) Reduction of phenylpyruvic acids to phenyllactic acids
in mammalian tissues.