**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 (the
          Company’s fourth fiscal
 quarter in the case of an annual report)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 (or
          persons performing equivalent functions):
 
 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
          15, 2006       /s/  
          Mark A. Emalfarb
 Mark A. Emalfarb
 Chief
          Executive
          Officer