Table 1 Average concentration and total recovery of nucleic acids isolated from different environmental and human origin samples.

From: An Improved Method for High Quality Metagenomics DNA Extraction from Human and Environmental Samples

Sample

Method

Nucleic acid concn. (ng/μl)

Total recovery (ng)

260/280

Stool

THSTI

543.3 ± 187.26 (DNA)

108660 ± 37520 (DNA)

1.85 ± 0.06

Stool

Kit

202.29 ± 105.63 (DNA)

20229.23 ± 10563 (DNA)

1.94 ± 0.23

Stool

ALHS

113.38 ± 62.26 (DNA + RNA)

11338.46 ± 6226 (DNA + RNA)

1.67 ± 0.07

Vaginal Swab

THSTI

104.77 ± 39.61 (DNA)

20955.38 ± 7923.13 (DNA)

1.69 ± 0.12

Vaginal Swab

Kit

8.37 ± 5.66 (DNA)

836.15 ± 566.7 (DNA)

1.43 ± 0.58

Vaginal Swab

ALHS

22.79 ± 9.5 (DNA + RNA)

2279.23 ± 906.02 (DNA + RNA)

2.47 ± 1.01

Soil

THSTI

53.16 ± 36.77 (DNA)

10633.84 ± 10317.18 (DNA)

1.48 ± 0.041

Soil

Kit

66.02 ± 70.13 (DNA)

6602.30 ± 7014 (DNA)

1.16 ± 0.05

Soil

ALHS

93.91 ± 103.17 (DNA + RNA)

9391.53 ± 7355.84 (DNA + RNA)

1.44 ± 0.07

Sewage water

THSTI

79.24 ± 80.71 (DNA)

15849.23 ± 12190 (DNA)

1.71 ± 0.041

Sewage water

Kit

14.47 ± 5.72 (DNA)

1447.69 ± 572 (DNA)

1.68 ± 0.05

Sewage water

ALHS

98.74 ± 60.95 (DNA + RNA)

9874.61 ± 8071 (DNA + RNA)

2.14 ± 0.07

Gastric Tissue Biopsy

THSTI

53.9 (DNA)

10780 (DNA)

1.85

Gastric Tissue Biopsy

Kit

126.5 (DNA+RNA)

12650 (DNA+RNA)

1.4

  1. In this study, 13 random samples from each category, except gastric tissue biopsy (n = 3), were used for comparative study. It is important to note that during nucleic acid extraction by the THSTI and Kit methods RNase treatment was included, while in the automated liquid handling system (ALHS) RNase treatment step is missing. Soil samples were heterogenous and maximum differences in DNA yield from similar amount of different samples were observed in each methods.