Definantly. I know many babies on another forum who have sensitivites to a whole host of food additives and preservatives Sulphites as you know cause strong reactions in adults - hayfever type symptoms, asthma flares, upset tummy, lethargy. Food chemicals definantly cross over into the breastmilk.
My DS2 is sensitive to several additives and preservatives, whilst we never tested sulphites he turned up positive to others so in the end it was easier just to exclude them all from my diet instead of labour through many food challenges.