The phrase "amount sufficient" is correct and usable in written English.
It can be used to indicate that a certain quantity or level is adequate for a particular purpose or requirement.
Example: "The funds allocated for the project were not an amount sufficient to cover all expenses."
Alternatives: "adequate amount" or "sufficient quantity".
But the bank did not deem the amount sufficient.
We settled on an amount sufficient to get me through the tollbooths scattered along the parkways ahead.
"And I will say to them, 'Well, how much 80's music do you have on your iPod?"' The answer, he said, is usually an amount sufficient to ensure a steady stream of Flock of Seagulls and Duran Duran.
But it does not appear as if Mr. Bush has much, if any, credibility left -- and certainly not in an amount sufficient to move the House or the Senate in any particular direction.
Since Fieldston does not plan to increase its total financial aid budget by an amount sufficient to cover all of the new awards, some families now receiving aid will get less help next year, the school said.
What is at stake here, according to the latest estimates of the United States Geological Survey, is 16 billion barrels of oil -- an amount sufficient to replace all of our imports from Saudi Arabia for the next 30 years.
Several types of thyroiditis can result in the release of stored thyroid hormone in amounts sufficient to cause hyperthyroidism.
The Nuclear Regulatory Commission has offered states free supplies of the drug, in amounts sufficient to protect all within 10 miles of a nuclear plant.
Except in special circumstances, sulfuric acid is the leachant used; it is supplied in amounts sufficient to obtain a final leach liquor at about pH 1.5.
Their venom is very potent and usually injected in amounts sufficient to kill a human within hours if medical treatment is not available.
We report the preparation of THCAS in amounts sufficient for the biocatalytic production of THC(A).
