EXHIBIT 99.1 CERTIFICATION PURSUANT TO SECTION 1350 OF CHAPTER 63 OF TITLE 18 OF THE UNITED STATES CODE AS CREATED BY THE SARBANES-OXLEY ACT OF 2002 I, Samuel C. Scott III, the Chief Executive Officer of Corn Products International, Inc., certify that (i) the report on Form 10-Q for the quarterly period ended September 30, 2002 as filed with the Securities and Exchange Commission on the date hereof (the "Report") fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and (ii) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of Corn Products International, Inc. /s/ Samuel C. Scott III . - -------------------------------- Samuel C. Scott III Chief Executive Officer November 12, 2002 23