Barca extended their unbeaten run to 38 games in the process and won their 16th consecutive game in which Turan has featured.
Turkish international Arda Turan did not start but made his Champions League debut coming on for Ivan Rakitic in the second-half.
Mesut Ozil started for Arsenal and despite creating three goalscoring chances he was unable to extend his assist record which currently stands at 19.
Neymar opened the scoring on 18 minutes with a clinical finish but January signing El Neny gave the Gunners a glimmer of hope when he netted just after the half-time break.
Luis Suarez ended any chances of a come back with a superb volley 15 minutes later and Ballon d’Or 2015 winner Lionel Messi put the icing on the cake with his sides third and final goal minutes before full-time.
Barcelona v Arsenal
Kick-Off: 19:45 (GMT)
Stadium: Camp Nou
Barcelona confirmed starting lineup: Ter Stegen, Rakitic, Sergio, Alves, Iniesta, Suárez, Messi, Neymar Jr, Mascherano, Alba. Mathieu
Manager: Luis Enrique
Arsenal confirmed starting lineup: Ospina, Monreal, Koscielny, Gabriel, Bellerin, Coquelin, Elneny, Sanchez, Ozil, Iwobi, Welbeck
Manager: Arsene Wenger
Goals: 18′ Neymar, 51′ El Neny, 65′ Suarez, 88′ Messi,