Section 10. Any documentary materials or data whatsoever made or received by any member or employee of the corporation, and consisting of, or to the extent that such material or data consist of, trade secrets, or commercial or financial information regarding the operation of any business conducted by an applicant for, or recipient of, any form of assistance which the corporation is empowered to render, or regarding the competitive position of such applicant in a particular field of endeavor, shall not be deemed public records of the corporation and shall not be subject to section 10 of chapter 66. Any discussion or consideration of such trade secrets or commercial or financial information, may be held by the board, or any subcommittee of the board, in executive sessions closed to the public, notwithstanding the provisions of section eleven A and one-half of chapter thirty A; provided, however, that the purpose of any such executive session shall be set forth in the official minutes of the corporation and business which is not related to such purpose shall not be transacted, nor shall any vote be taken during such executive sessions.