[A rapid spectrophotometric method of determining heat-resistant lysosomes in animal tissues].

Rapid spectrophotometric method for the determination of thermoresistance in tissue animal lysosomes is described. The of analysis is decreased by 5-6 h, in comparison with enzymatic technique. The determination regimen was chosen in such a way that the process of lysosomal lysis was linear. The dependence of the incubation mixture temperature on the degree of lysosomal lysis was complex. The rate of lysosomal lysis rapidly increased at greater than 37 degrees C. Lysosome incubation at 0-4 degrees C for 24 h decreased its hypothermal (t = 10-30 degrees C), but not hyperthermal (t greater than 37 degrees C) sensitivity. Isolated lysosome thermoresistance may be used as an index of its stability and labialization in vivo and in vitro by various physico-chemical factors. The percentage of initial absorption (A520) and the initial rate of lysosomal lysis (delta A520/min), as well as melting temperature (Tmel) and biological half-life (t1/2) may be the measurements of such effect.