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SQUID Magnetometry of Concentration Models of Iron-Containing Proteins Cover

SQUID Magnetometry of Concentration Models of Iron-Containing Proteins

Open Access
|Oct 2026

Figures & Tables

Fig 1.

M(H) dependences of cotton wool, hemoglobin, myoglobin, and ferritin preparations measured at 300 K.

Fig 2.

M(H) dependences of hemoglobin, myoglobin, and ferritin preparations measured at 2 K after the diamagnetic corrections.

Table 1.

Derived parameters from M(H) dependences of protein preparations measured at 2 K.

HC [A/m]MR [10−3Am2/kg]MMAX [Am2/kg]
Hemoglobin1702 ± 810.49 ± 0.030.44 ± 0.21
Myoglobin1032 ± 690.32 ± 0.020.46 ± 0.22
Ferritin 1164561 ± 8240188.03 ± 9.512.71 ± 0.12
Ferritin 2275173 ± 14520231.50 ± 10.251.95 ± 0.98

[i] Note: Values represent mean (n = 3) ± standard deviation (SD) of HC, MR, and MMAX.

Fig. 3(a).

HC vs C for hemoglobin, myoglobin, and ferritin concentration models. SD of HC is 80, 83, 2400, and 2940 for hemoglobin, myoglobin, ferritin 1, and ferritin 2 models. The straight lines represent a linear regression of the measured data for each model (R2 = 0.092, 0.178, 0.433, 0.117, with slope 66, −88, −5431, −4975 and intercept 604, 1170, 152738, 289016).

Fig. 3(b).

MR vs C for hemoglobin, myoglobin, and ferritin concentration models. SD of MR is 4.6 × 10−6, 5.1 × 10−6, 5.5 × 10−4, and 5.4 × 10−4 for hemoglobin, myoglobin, ferritin 1, and ferritin 2 models. The lines are a linear regression of the measured data for each model (R2 = 0.943, 0.979, 0.974, 0.970 with slope 8.5 × 10−5, 1.9 × 10−4, 9.6 × 10−2, 11.3 × 10−2 and intercept 1.4 × 10−5, 2.58 × 10−5, 1.6 × 10−2, 2.2 × 10−2).

Fig. 3(c).

Dependence of MMAX vs C for hemoglobin, myoglobin, and ferritin concentration models. SD of MMAX is 9.6 × 10−3, 8.6 × 10−3, 1.6 × 10−3, and 1.8 × 10−3 for hemoglobin, myoglobin, ferritin 1, and ferritin 2 models. Lines are a linear regression of measured data for each model (R2 = 0.978, 0.986, 0.987, 0.980 with slope 17.1 × 10−2, 23.5 × 10−2, 1.67, 0.95 and intercept 3.5 × 10−2, 3.6 × 10−2, 15.0 × 10−2, 13.9 × 10−2).

Fig. 4.

Superposition of individual proteins into the resulting curve. Simulated concentration of 0.1 gPT/g was used for hemoglobin and myoglobin, and 0.05 gPT/g was used for both ferritin preparations.

Language: English
Page range: 245 - 249
Submitted on: Aug 4, 2026
Accepted on: Sep 16, 2026
Published on: Oct 2, 2026
Published by: Slovak Academy of Sciences, Institute of Measurement Science
In partnership with: Paradigm Publishing Services
Publication frequency: Volume open

© 2026 Martin Škrátek, published by Slovak Academy of Sciences, Institute of Measurement Science
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.