TABLE 2.
Measurement of pH of caseum in various species using different techniques
| Species | Nature of specimen | Measurement technique | pH range | Reference |
|---|---|---|---|---|
| C3HeB/FeJ mouse | In situ | 16-gauge needle tip micro-pH electrode | 7.2–7.5 (7.4a ) | 154 |
| Homogenate | pH indicator strips | 7.4–7.6 | 9 | |
| Guinea pig | In situ | 16-gauge needle tip micro-pH electrode | 7.0–7.5 (7.2a ) | 150 |
| Rabbit | 3-fold diluted in water | pH indicator strips | 7.0–7.5 | 13 |
| Undiluted smear | pH indicator strips | 6.1–8.0 (6.7b ) | 10 | |
| Homogenate in sucrose solution | Glass electrode | 6.4–7.4 | 102 | |
| Human | In situ | pH indicator strips | 5–7.1 (5.5b ) | 103 |
| Homogenate | Glass electrode | 7.3–8 | 104 | |
| Aspiratesc | Glass electrode | 7.2–7.5 | 105 |
a
Mean.
b
Median.
c
Nonpulmonary TB.