Table 5. Effect of extraction of solubles (ES) on analytic performance.
| SC/g/100 g | Average effect/g/100 g (%) | C.V./% | V.R. | |
| Sample | 3.639 | 0.572 (19)** | 2.4 | 0.61 |
| Organ | ||||
| Twig | 2.176 | 0.566 (35)** | 3.5 | 3.55* |
| Mature | 1.991 | 0.332 (20)** | 3.1 | 0.21 |
| Root | 6.748 | 0.818 (14)** | 1.7 | 0.66 |
| Species*Organ | ||||
| Acer | 10.668 | 0.834 (8)** | 1.0 | 0.38 |
| Twig | 5.928 | 1.049 (22)** | 0.2 | 0.07 |
| Mature | 5.335 | 0.338 (7)* | 0.8 | 0.14 |
| Root | 20.74 | 1.116 (6)* | 0.7 | 0.46 |
| Magnolia | 1.060 | 0.221 (26)** | 8.4 | 3.18 |
| Twig | 1.058 | 0.054 (5) | 5.3 | 1.25 |
| Mature | 0.947 | 0.148 (19) | 6.2 | 1.57 |
| Root | 1.175 | 0.460 (64)* | 8.1 | 38.0* |
| Cedrus | 0.907 | 0.751 (478)** | 11.0 | 0.56 |
| Twig | 1.022 | 1.031 (ā)** | 10.3 | 36.2* |
| Mature | 1.037 | 0.600 (137)* | 4.5 | 0.07 |
| Root | 0.663 | 0.621 (1479)* | 12 | 2.08 |
| Pinus | 1.919 | 0.484 (34)** | 2.3 | 2.02 |
| Twig | 0.697 | 0.132 (23) | 5.0 | 4.49 |
| Mature | 0.647 | 0.245 (61)** | 7.9 | 1.28 |
| Root | 4.412 | 1.074 (32)** | 0.3 | 0.93 |
The effect on starch detection was calculated by subtracting the SC determined without pretreatment (Table 4) from the starch content (SC) determined after ES. In brackets the effect is expressed as per cent increase in SC. The effect was deemed significant for p<0.05 (*), p<0.01 (**). The precision for samples analysed after ES was expressed as coefficient of variation. The precision after ES was compared to the precision for the same samples (Table 4) analysed without pretreatment (expressed as variance ratio, V.R.). In an F-test, V.R. was significantly higher than unity (ES decreased precision) at p<0.05 (*). Sample averages all samples. Twig, Mature, and Root average the 4 species. Acer, Magnolia, Cedrus, and Pinus average the three organs; nā=ā3.