Faruk Gullu, the chairman of the Faruk Gulluoglu chain of sweet shops and restaurants, was remanded in custody by an Istanbul court on charges of being a member of the group of US-based cleric Fethullah Gulen which is blamed for the failed coup, the state-run Anadolu news agency said.
Faruk Gulluoglu is one of Turkey's best known suppliers of baklava, the traditional sweet pastry that rounds off meals, and its main shop is a magnet for tourists in Istanbul.
But the court also remanded in custody Omer Faruk Kavurmaci, CEO of the Aydinli Group clothing retailer, one of the most prominent business figures detained after the coup.
Kavurmaci is the son-in-law of Istanbul mayor Kadir Topbas, a ruling party member and close associate of President Recep Tayyip Erdogan.
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The company owns the rights to the brands US Polo Assn, Cacharel and Pierre Cardin in Turkey and across the region. Kavurmaci is charged with "membership of a terror group", Anadolu said.
All had been detained in raids in mid-August with their detention periods prolonged in line with the three-month state of emergency imposed after the coup.
Turkey has pressed a relentless crackdown after the coup, with some 20,000 people from all professions including the military, education and journalism detained.
In a separate development, Istanbul prosecutors issued arrest warrants for 92 more people, including six generals, on suspicion of links to Gulen and the coup, Turkish media said.
Meanwhile two fugitive Turkish admirals were detained late on Wednesday after almost two months on the run, the Dogan news agency said.