Can we keep FM powder in fridge to prolong the lifespan?

Actually it should be refridgerated after opening. But I didn't do it as normally I will keep in airtight container and finish it within one week. Once refrigerated, you can use the formula milk before the expiration date. Read more from this link:-www.eatbydate.com/dairy/milk/how-long-does-infant-formula-last-shelf-life-expiration-date/