Table 1 The zeta-potential of suspensions prepared from sepiolite in the presence of polycations with and without DNA (from salmon sperm) in the medium.

From: Physical interactions between DNA and sepiolite nanofibers, and potential application for DNA transfer into mammalian cells

Sample composition

Zeta-Potential (mV)

Bionanocomposite

Z-Potential (mV)

Sepiolite 1 mg·ml−1 10 mM Tris-HCl pH = 7.5

−11.7

Sepiolite 1 mg·ml−1 DNA 710 ng·μl−1 10 mM Tris-HCl pH = 7.5

−26.5

Sepiolite 1 mg·ml−1 10 mM Tris-HCl pH = 7.5 10 mM MgCl2

−4.33

Sepiolite 1 mg·ml−1 DNA 710 ng·μl−1 10 mM Tris-HCl pH = 7.5 10 mM MgCl2

−9.48

Sepiolite 1 mg·ml−1 10 mM Tris-HCl pH = 7.5 10 mM CaCl2

−5.08

Sepiolite 1 mg·ml−1 DNA 710 ng·μl−1 10 mM Tris-HCl pH = 7.5 10 mM CaCl2

−10.0

Sepiolite 1 mg·ml−1 10 mM Tris-HCl pH = 7.5 1 mM spermidine

+6.28

Sepiolite 1 mg·ml−1 DNA 710 ng·μl−1 10 mM Tris-HCl pH = 7.5 1 mM spermidine

−12.5

Sepiolite 1 mg·ml−1 10 mM Tris-HCl pH = 7.5 1 mM spermine

+12.8

Sepiolite 1 mg·ml−1 DNA 710 ng·μl−1 10 mM Tris-HCl pH = 7.5 1 mM spermine

−8.09

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