Exhibit 31.1

                           Dyadic International, Inc.
     Certification Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

I, Mark A. Emalfarb, Chief Executive Officer, certify that:

1.      I have reviewed this Quarterly Report on Form 10-QSB of Dyadic
        International, Inc. (the "Company");

2.      Based on my knowledge, this Quarterly Report does not contain any untrue
        statement of a material fact or omit to state a material fact necessary
        to make the statements made, in light of the circumstances under which
        such statements were made, not misleading with respect to the period
        covered by this Quarterly Report;

3.      Based on my knowledge, the financial statements, and other financial
        information included in this Quarterly Report, fairly present in all
        material respects the financial condition, results of operations and
        cash flows of the Company as of, and for, the periods presented in this
        Quarterly Report;

4.      The Company's other certifying officer and I are responsible for
        establishing and maintaining disclosure controls and procedures (as
        defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the Company
        and have:

        a)      Designed such disclosure controls and procedures, or caused such
                disclosure controls and procedures to be designed under our
                supervision, to ensure that material information relating to the
                Company, including its consolidated subsidiaries, is made known
                to us by others within those entities, particularly during the
                period in which this Quarterly Report is being prepared;


        b)      Evaluated the effectiveness of the Company's disclosure controls
                and procedures and presented in this Quarterly Report our
                conclusions about the effectiveness of the disclosure controls
                and procedures, as of the end of the period covered by this
                Quarterly Report based on such evaluation; and

        c)      Disclosed in this Quarterly Report any change in the Company's
                internal control over financial reporting that occurred during
                the Company's most recent fiscal quarter that has materially
                affected or is reasonably likely to materially affect the
                Company's internal control over financial reporting; and

5.      The Company's other certifying officer and I have disclosed, based on
        our most recent evaluation of internal control over financial reporting,
        to the Company's auditors and the audit committee of Company's Board of
        Directors:

        a)      All significant deficiencies and material weaknesses in the
                design or operation of internal control over financial reporting
                which are reasonably likely to adversely affect the Company's
                ability to record, process, summarize and report financial
                information; and

        b)      Any fraud, whether or not material, that involves management or
                other employees who have a significant role in the Company's
                internal controls over financial reporting.

Date: May 16, 2005                         /s/ Mark A. Emalfarb
                                           ------------------------------
                                               Mark A. Emalfarb
                                               Chief Executive Officer