Approximately 5 mL of the strained rumen fluid was taken for microbial population study while another 10 mL of the fluid was mixed with 2 mL 25%
metaphosphoric acid (w:v) for volatile fatty acid analysis.
In addition, 400 [micro]L of the supernatant from the other microcentrifuge tube was mixed with 400 [micro]L of a
metaphosphoric acid solution (Sigma Aldrich, St Louis, MO, USA) for deproteination.
A 10 ml of ruminal fluid was acidified with 1 ml H2SO4 (50%) for ruminal NH3-N analysis and 10 ml of ruminal fluid was mixed with 2 ml of 25% (wt/vol)
metaphosphoric acid for volatile fatty acid (VFA) analysis.
A comparison of
metaphosphoric and oxalic acids as extractant solutions for the determination of vitamin C in selected vegetables.
One hundred-microliter aliquots of washed RBCs were added to 300 mL ice-cold 5%
metaphosphoric acid.
Briefly, 20 mL of
metaphosphoric acid at 4.5% (w/v) was added to 500 mg of the sample and the mixture was stirred with magnetic shaking (P-Selecta, Asincro, Spain) for 15 min under dark conditions.
5 mL of 5% (w/v)
metaphosphoric acid in 20% (v/v) methanol was added into the samples, and the mixtures were sonicated in an ultrasonic bath at room temperature for 10 min.
Renal tissue homogenate was processed by the addition of four volumes of ice-cold 5%
metaphosphoric acid and centrifuged at 4000 rpm for 10 min at 4[degrees]C.
Hydrochloric acid,
metaphosphoric acid, formic acid, acetic acid, methanol, acetonitrile, sodium metabisulphite, potassium chloride, sodium acetate, acid potassium dichromate, ethyl acetate, and potassium dihydrogen phosphate were purchased from Merck (Madrid, Spain).