either [(b) in the case of gelatine, was produced by a process that ensured that unprocessed Category 3 material was subjected to a treatment with acid or alkali, followed by one or more rinses, involving pH adjustment, extraction by heating one or several times in succession, followed by purification by means of filtration and sterilisation, in order to kill pathogenic agents;]
d’une exposition des matières concernées à un pH de 1 à 2, puis à un pH de plus de 11, et ensuite d’un traitement thermique à une température supérieure à 140 °C pendant 30 minutes et à une pression de 3 bars;]