Mayor Marion Barry's 1982 campaign committee received $28,500 after he had already won reelection--with more than one-third of that amount coming from a Buffalo corporation that was awarded a major food service contract at the new Washington Convention Center last September.

Overall, Barry's committee raised and spent a record $1.33 million to elect the mayor to his second four-year term last November, according to a final report of receipts and expenditures filed this week with the D.C. Office of Campaign Finance.

Delaware North Companies Inc. of Buffalo, an international food service conglomerate, and four of its subsidiaries contributed $2,000 each, for a total of $10,000, to Barry's committee on Dec. 22, nearly two months after the general election.

One of those subsidiaries, Sportservice Corp., was awarded a contract last Sept. 22 to provide food and catering services at the convention center. The contract is worth an estimated $20 million to $40 million over a 10-year period.

"It's like any other business contribution," Sam Gifford, director of communications for Delaware North, said of the contributions to Barry's committee. "It's in our interest to maintain friendly and good relations with the administration . . . We support candidates and people who are probusiness."

Annette Samuels, Barry's press secretary, said yesterday she was unaware of the Delaware North contributions and declined to comment on them.

Other major postelection contributions to Barry's campaign committee included $2,000 from the Chessie System Officers' Good Government Fund, $2,000 from Joe T. Artis, a Capitol Heights plumber, and $1,035 from the Anacostia Professional and Merchants Association.

The campaign committee also reported $2,058 in "miscellaneous unexplained receipts."

Keith Vance, director of the city's office of campaign finance, said Barry's committee officially went out of business on Wednesday, after campaign Treasurer Ann R. Kinney filed a final amended report with his office.

"They zeroed out their campaign, so all of the money has been spent," he said.

The financial statements filed by the commmittee provided the only available information on how the funds were spent. Kinney was out of the country yesterday and couldn't be reached for comment.

Deputy Mayor Ivanhoe Donaldson, who served as Barry's campaign manager, also was unavailable for comment.

A large portion of the postelection contributions was used to pay or reimburse committee employes, purchase computer service, rent equipment and pay other miscellaneous expenses.

Funds also were spent for food, balloons, travel and medical expenses, according to the committee's financial statement.

For instance, the committee reported spending about $2,300 for meals in late December and early January at the Capital Hilton Hotel, Channel Inn-Pier 7 and Quigley's.

The committee paid $159.73 to Providence Hospital on Jan. 4 for unexplained "medical services." On Jan. 17, it paid $140 to Balloons Unexpected.

Also, the committee reported that it purchased a $242 ticket from United Airlines on Feb. 17 and a $64 airline ticket on March 9, but the report did not say who used the tickets or where they went.

Barry was in Chicago on Feb. 19, to campaign for Harold Washington in the Chicago mayoral primary. Samuels said yesterday that the mayor paid his own way to Chicago and that she did not know who had used the two tickets purchased by the campaign committee.

Vance said that it was legal for Barry's committee to use campaign funds for postelection travel, as long as those expenditures were reported. He said a preliminary review indicated that the committee's expenditures in general were within the provisions of the law.

"A preliminary desk audit of Barry's committee reports shows minimal accounting problems," he said. "They're substantially in compliance."