The phrase "a much smaller amount of" is correct and usable in written English.
It could be used to describe a quantity that is much lesser than the expected amount or amount typically seen. For example: "The company had expected to make a large profit this year, but due to the unexpected market crash, they only made a much smaller amount of money."
A much smaller amount of funding for the dam project, $1.7bn, had been agreed during earlier legislation in the House.
She said a much smaller amount of chlorinated sewage from the original leak would be reaching the Hudson at Yonkers.
Buildings are an easier target and could be contaminated with a much smaller amount of anthrax pumped through a garden spray bottle, experts say.
Some need a much smaller amount of time; there may only be one artist and normally they can help to get works that you need.
A much smaller amount of free nitrogen is fixed by abiotic means (e.g., lightning, ultraviolet radiation, electrical equipment) and by conversion to ammonia through the Haber-Bosch process.
Now, because of the niche quality viewing, you've got, at least on cable shows, a much smaller amount of people who don't have that.
Under the alternative approach gaining favor inside the Fed, it would announce purchases of a much smaller amount for some brief period and leave open the question of whether it would do more, a decision that would turn on how the economy is doing.
If you have a much smaller amount in savings, the benefits of the personal savings allowance are negligible.
Compared to traditional resin-based coIP, MSIP requires much smaller amount of cell lysates, allows for a large number of samples to be studied en masse without the need for further manipulation of the slides, and eliminates the need for further immunofluorescence staining or enzymatic amplification.
Compared with the case of coal and activated carbon, much smaller amount of O2 is enough to result in the rapid size decrease rate in the resin particle.
The OP brown sugar had lighter color due to the lower temperature used in its drying solidification process, and a larger open-surface design to facilitate evaporation in its processing line made the brown sugar contains much smaller amount of volatile aroma components.
