**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 oromit
        to
        state a material fact necessary to make the statements made, in light of
        the
        circumstances
 underwhich such
        statements were made, not misleading with respect to the period covered by
        this
        QuarterlyReport;
 
 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:
        November 14, 2005       /s/  
        Mark A. Emalfarb
 Mark A. Emalfarb
 Chief
        Executive
        Officer