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Table 1 Corrected and calibrated values of reference materials analyzed as unknowns for samples containing 2 to 40 μg C

From: Natural abundance isotope ratios to differentiate sources of carbon used during tumor growth in vivo

Material δ13C calibrateda δ13C measured (all reps) δ13C measured (2–3 μg C reps only)b
JALA − 20.62 ± 0.03 (25) − 20.59 ± 0.06 (91) N/A
GLUC1 − 12.45 ± 0.04 (10) − 12.44 ± 0.13 (84) − 12.50 ± 0.17 (16)
GLUC2 − 19.93 ± 0.03 (10) − 19.91 ± 0.07 (84) − 19.91 ± 0.10 (16)
GLUC3 − 26.38 ± 0.04 (10) − 26.37 ± 0.06 (35) − 26.33 ± 0.07 (12)
  1. Mean values ±1 standard deviation. Number of measurements reported in parentheses. aCalibrated against IAEA standards LSVEC and NBS-19. bIncluded to illustrate accuracy and precision at the lowest carbon amounts measured