Scotland will retain its strong position in the "massively intimidating" international markets if it remains part of the UK, according to Scottish Secretary Michael Moore.
UK Government agencies are promoting the interests of Scotland's five million citizens every week in large countries like Brazil which has a population of 190 million, Mr Moore said before visiting Rio de Janeiro.
Mr Moore will meet figures from the Brazilian government and oil industry as lead minister in the UK Government's Trade and Investment (UKTI) Energy Showcase this week.
He is also leading the UK Government's fight against Scottish independence.
UKTI is a prime example of how Scotland can harness the UK's international reach and influence to open doors for Scottish companies, Mr Moore said.
"Brazil is a vitally important market that the UK Government is investing a great deal of time and resource in. A number of senior ministers from the UK, including the Prime Minister and Deputy Prime Minister, have recently made the journey to Brazil to help develop Britain's connections and business opportunities," he said.
"When you go to a country with more than 190 million people such as Brazil you see at first-hand how Scotland benefits from being part of the overall UK effort. There are massive opportunities for Scotland but it can also be massively intimidating.
"Every week staff from UKTI and the Foreign and Commonwealth Office are working hard in places like Sao Paulo and Rio to assist Scottish companies. There are big opportunities for Scotland to do business in Brazil. Our expertise in areas such as energy are highly sought after in Brazil's emerging oil industry.
"Combining UK influence and Scottish excellence gives us the best of both worlds as we try to do business with Brazil that will create jobs back at home."