High oven temperature — cold on‐column injection for the automated CGC analysis of high molecular weight compounds such as triglycerides

Modification of the Carlo‐Erba cold on‐column injector for (automated) analysis of high molecular compounds at high oven temperature is described. The secondary cooling tube of the cold on‐column injector is replaced by a lengthened tube through which a high air flow is directed. The injection site is maintained at 65–70 °C while the oven is at high temperature (≷ 300 °C). For automated injection, a short deactivated precolumn of 22 to 30 cm × 0.53 mm i.d. is coupled to the analytical column via a butt connector with make‐up gas supply. For a triglyceride mixture, automatically injected at 300 °C, the mean % deviation for all peak areas was 1.8% and the mean % deviation for all retention times was 0.09 % for five consecutive runs.