A substance or agent that causes gelatinization; something that converts other substances into gelatin or gel form.
From 'gelatinize' + '-er' suffix (agent noun), meaning 'something that gelatinizes'.
Pectin is a natural gelatinizer that jams rely on—it's why fruit jams gel when you cook them with sugar, and different fruits have different pectin levels, which is why some jams need pectin powder and others don't.
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