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HANUS, O., HERING, P., GENCUROVA, V., MOTYCKA, Z., JEDELSKA, R., KOPECKÝ, J.: Validation of deep freezing of pilot samples for checking of time stability of indirect analyses of basic milk composition and for their long shelf-life. Acta univ. agric. et silvic. Mendel. Brun., 2008, LVI, No. 5, pp. 57-68 Essential part of raw milk component measurement is indirect infraanalyse. The checking of time measurement stability is important there. The preparation of pilot samples was described. Informa- tion about deep frozen milk pilot sample stability are sporadic. Aim of this work was to verify the sta- bility of long-term stored and deep frozen pilot samples (FPSs). Pilot samples were frozen in liquid ni- trogen bath −196 °C and aer that stored at −21 °C for one month (A) and more months (B) till analyse. The pilot samples were measured by CombiFoss 6000: fat F (%); protein CP (%); lactose L (%); casein C (%); solid non fat SNF (%); urea U (mg/100ml); somatic cell count SCC (ths./ml). In the short-term (A) experiment the impact of freezing on pilot milk samples was relatively small, in the framework of ac- ceptable value of repeatability (±0.02 %) for components. The stability of values of FPSs was better according to standard deviations for important F evaluation in H (Holstein) breed samples. The re- peatability of values of FPSs in the time was very good for other components. The repeatability was better for SCC in J (Jersey) breed samples (±16.5 thousands/ml). That is why the higher variability (±30.1 thousands/ml) in H sample is visible less sceptically. The apparent result trends were not ob- servable in the repeatability development of important milk indicators in FPSs. The mild trend was only in CP, but this trend covered absolutely very small shi (variation range). There are only oscilla- tions, which are similar between J and H samples. It is possible to attribute these oscillations rather to instrument eff ects than to sample eff ects. The oscilations were markedly higher in the long-term (B) experiment. Between J and H samples the oscilations were very similar in curves F and L. It is also possible to attribute them more to instrumental eff ects. The repeatability values (standard deviations sd) of FPSs were mostly lower than ±0.06 %. It is acceptable for result agreement between indirect and reference method. Relevant sd varied from ±0.025 % for L to ±0.059 % for F (in J breed) with exception CP ±0.085 % in J sample. Also B procedure was shown as applicable for instrumental sability control in half year period. In practice the one reference value for concrete FPS is valid from one to next calibra- tion. Persistent trend in repeatability of FPSs can indicate an inadequate instrumental dri . The ap- plied FPS procedure is usable for stability control of instrumental measurement in milk laboratories. milk, pilot sample, deep freezing, long shelf-life, measurement stability checking, indirect method, infraanalyse, fat, protein, somatic cell count

acta universitatis agriculturae et silviculturae mendelianae brunensis

Validation of deep freezing of pilot samples for checking of time stability of indirect analyses of basic milk composition and for their long shelf-life