And Panikvar made a brave block after eight minutes, when he stopped Fraser Fyvie's acrobatic effort.
Shopper Lesley Anne Fyvie left Aberdeen at 0400BST to arrive in time for the opening.
Goalkeeper Stuart Nelson was handed his debut, Mulgrew and Fraser Fyvie were also brought in.
Fyvie Castle, in Aberdeenshire, recorded a temperature of 22.8C shortly after 15:30, edging past the previous high of 22.2C.
McGhee was forced to make a change after 27 minutes, with the injured Young replaced with Fraser Fyvie, who was celebrating his 17th birthday.
Aberdeen's Fraser Fyvie was sent off in stoppage time for dissent.
Kaylee McIntosh, 14, from Fyvie, Aberdeenshire, drowned after becoming trapped under a boat during a training exercise in Loch Carnan in the Outer Hebrides in 2007.
The Ghana midfielder was sent-off for a challenge on Fraser Fyvie not long after coming on as a substitute in the 1-0 victory for the visitors.
United's defence looked hesitant in the opening 15 minutes and Kenneth had to make a good blocking tackle on Fyvie, who had beaten the offside trap.
Fyvie centred the ball for Aluko, whose low shot took a wicked deflection off Ross before trickling into the goal despite the best efforts of Gallacher and Potter.
But when the match eventually got under way it was Aberdeen who came out of the blocks sharper, with Fraser Fyvie and Peter Pawlett troubling United on the wings.
Speaking during a visit to the Fyvie war memorial in Aberdeenshire, Mr Salmond said the new fund would help communities across Scotland to continue to pay their respects to those who fell during both world wars and other conflicts.
Fyvie was shown a red card for foul and abusive language as St Mirren, who had beaten the Dons in four of their previous five league fixtures, made sure of a disappointing end to Brown's anniversary exactly a year to the day since he took charge at Pittodrie.
The Dons doubled their advantage after 17 minutes when Fyvie was given too much time and space on the edge of the area to pick out Fallon at the back post and the New Zealand forward stooped to head home his first goal in the SPL from only three yards out.
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