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We studied the microscopic polymer conformations in the droplet detachmentprocess of an elastic semi-dilute polyelectrolytic Xanthan solution bymeasuring the instantaneous birefringence. As in earlier studies, we observethe suppression of the finite time singularity of the pinch-off process and theoccurrence of an elastic filament. Our microscopic measurements reveal that therelatively stiff Xanthan molecules are already significantly pre-stretched toabout 90 % of their final extension at the moment the filament appears. Atlater stages of the detachment process, we find evidence of a concentrationenhancement due to the elongational flow

Molecular configurations in the droplet detachment process of a complex liquid