Formulation options include use of high-intensity sweeteners. Processing techniques include using pre-aeration of the mix to produce smaller, more stable air bubbles.
It is important to minimize and stabilize the size of ice crystals. Pre-aeration promotes small air bubbles with inherent resistance to growth during manufacturing and handling.
As we have often noted, ice cream is the only food intended to be consumed frozen. Thus, dairy processors need to protect that which fails first, i.e., body and texture (which can be described as bite, chew, smoothness and creaminess.)
Certain ingredients allow ice cream to travel farther and recover from heat shock. But that doesn’t matter to the label-reading consumer. Here are some strategies for ice cream manufacturers to deliver a cleaner label.
Consumer interest in clean labels (that is, the use of ingredients perceived to occur naturally in foods) has created a challenge to ice cream formulators.
Using ‘rare’ sugars in ice cream and frozen dessert formulas affects everything from nutrition labeling to processing considerations, like the freezing point depression.
In our May column, we discussed the so-called “rare” sugars. These are sugars found in nature but at ultra-low levels. The most commercially available rare sugars are tagatose and allulose, recognized as providing sucrose-like sweetness (~ 0.90 and ~0.70, respectfully) at significantly lower caloric contributions (1.5 and 0.20 calories per gram, respectively).
There is a growing mandate from health authorities to reduce consumption of sugars (i.e., mono- and di-saccharides). For example, the current Dietary Guidelines for Americans call for significant reduction in calories from “added sugars.” Excluding lactose (which could eventually be included), current frozen desserts can contribute up to 22 grams of added sugars per serving, representing approximately 80% of total calories. The numbers will surge as serving sizes are increased to reflect the amounts typically consumed by Americans.
Extremely cold ‘cryobits’ accelerate temperature reduction of the packaged product. Ice crystals and air bubbles are significantly smaller with partial cryogenic hardening compared to traditional hardening methods.
The cryogenic freezing of ice cream is appealing because the very rapid temperature drop it produces generates extremely small ice crystals that promote smooth texture and extended textural shelf life. To date, technical, operational and economic factors have limited its use in conventional production to a few value-added products such as novelties and ice cream cakes/pies.
With the FDA mulling a requirement to label ‘added sugars,’ now is the time to look at various sweetening systems, and the ramifications of using them.
Stabilizers control the movement of water, the growth of ice crystals and the size of air bubbles. The right blend of stabilizers (and emulsifiers, too) can make all the difference in the end product.
It is not a simple matter when you add nuts, cookies or ribbons to ice cream mix. Pay attention to formulas, overrun, food safety, processing and economics. Proceed carefully and you’ll end up with a great product.