Jubilant FoodWorks operates Domino's Pizza and Dunkin Donuts chains.
The scrip of Jubilant Food that lost 12.35 per cent to Rs 975 in intra-day trade, later recovered most of its lost ground and finally ended at Rs 1,063, down 4.45 per cent on BSE.
Shares of Britannia too fell by 1.06 per cent to end at Rs 2,652.55.
Westlife Development, however pared all its early losses and ended with a gain of 1.11 per cent at Rs 222.35 after falling 9 per cent to Rs 200 during the day. It runs McDonald's restaurants in west and south markets through its subsidiary.
Nearly 84 percent of 38 commonly available brands of pre- packaged breads, including pav and buns, tested positive for potassium bromate and potassium iodate, banned in many countries as they are listed as "hazardous" for public health, the report by Centre for Science and Environment (CSE) said.
The tested bread samples included brands such as Britannia, Harvest Gold and the fast food chains like KFC, Pizza Hut, Domino's, Subway, McDonald's and Slice of Italy.