The strand extruded with caproic acid ([C.sub.a] l28) presented the greatest resistance to tension and greatest elongation in relation to the other formulations.
Therefore, the formulations containing caproic acid had one OH group per mole of acid (116.16 g).
It is observed from this diagram that the use of an optimal amount of amino caproic acid in the feed improves the results.
The use of optimal amounts of amino caproic acid (from the depolymerization of scrap nylon-6) in the feed improves the results further.
To an aliquot of 1.3 ml supernatant, 0.1 ml of reference volatile fatty acid (caproic acid
) and 0.1 ml of 0.5 M [H.sub.2]S[O.sub.4] were added.
The concentration of butyric acid in milk fat of various groups showed no significant difference while caproic acid
, caprylic acid and capric acid showed significantly (p<0.05) higher values in cows of group 1 (control, without bypass fat) than in the cows of groups 2, 3 and 4 (Table 8).
Although common SCFAs include formic, acetic, propionic, butyric, isobutyric, valeric, isovaleric, and caproic acids
, 90-95% of the SCFAs present in the colon are constituted by acetate, propionate, and butyrate , with intraluminal concentrations of about 60% acetate (C2), 25% propionate (C3), and 15% butyrate (C4) .
The SCFA (acetic, propionic, isobutyric, butyric, isovaleric, valeric, and caproic acids
) and one MCFA (medium chain fatty acid, heptanoic acid) in the intestinal content (caecum, proximal and distal colon) were analysed using a GLC method .