Check with your state law, because this differs vastly from state to state. Generally speaking, an officer of a corporation can take an acknowledgement on a deed or other document favoring the corporation. Loan officers routinely take acknowledgements of borrowers on mortgages.
I have a question concerning the independent third party issue of notaries public. I have formed a corporation to do my real estate investing. I was thinking about setting up my sister to become a notary public so that I will have a notary public available at all times. Is this a good idea? She is currently listed in state records as the secretary of the corporation. Can she serve in both offices? I can always find someone else to become secretary, if needed.