The Sensex at the Bombay Stock Exchange surrendered all its initial gains, to stand 227 points, or 1.2 percent in negative territory, at 19,160, in volatile trade, a short while ago. The market fell on heavy selling in IT stocks, amid concerns about inflation and high crude oil prices. Earlier in the morning, however, the Sensex had opened 55 points higher, at 19,442, and had gained more than 250 points at one stage, amid a positive opening on the regional bourses.But most regional stock markets also reversed initial gains, today, as China raised the required reserve ratio for the country's banks. So the key benchmark indices in Japan, China, Hong Kong, Taiwan and South Korea were all slightly in the red.