The Indian equity benchmarks erased intraday gain in noon deals on the back of profit booking ahead of weekly expiry of index futures and option contracts. The Sensex fell as much as 428 points from the day's highest level and Nifty 50 index dropped below its important psychological level of 15,950 after hitting an intraday high of 16,071. Tata Consultancy Services, Axis Bank, Hindustan Unilever, ITC, State Bank of India, ICICI Bank and HCL Technologies were among the top drags on the Sensex.