Fruits
Purple Sweet Potato in gelato
Purple sweet potato (Ipomoea batatas) is a starchy, anthocyanin-rich root used in gelato as a natural violet color and earthy-sweet flavor base. It contributes high total solids and body but only modest free sugar, so it firms the mix more than it sweetens it.
Balancing parameters
Per 100 g of product, verified against independent food-science sources (listed below).
| Parameter | Value |
|---|---|
| Total Solids | 37.5% |
| Water | 62.5% |
| Sugars | 4% |
| Fat | 0.1% |
| MSNF | 0% |
| Protein | 1.5% |
| POD (sweetening power) | 4.3 |
| PAC (anti-freezing power) | 5.4 |
Typical use: 15-30% of the mix as a cooked puree base
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Open the balancerHow to use it in gelato
Purple sweet potato is a high-solids, low-fat flavor base best used as a cooked, sieved puree. Its abundant starch (~20 g/100 g) raises total solids and viscosity, adding chew and body; balance this by trimming other solids and adding liquid so the mix stays scoopable. Free sugars are low (~4 g/100 g raw), giving a modest anticongelante contribution (PAC ~5.4 sucrose-equivalent per 100 g), so it barely lowers the freezing point on its own; rely on your dextrose/sucrose blend for softness. Steaming or baking before pureeing gelatinizes the starch and lets beta-amylase convert some starch to maltose, deepening sweetness and improving smoothness. Keep the base near neutral pH to hold the violet hue, since anthocyanins shift toward pink-red in acid.
Origin & background
Sweet potato was domesticated in the Americas over 5,000 years ago and spread across the Pacific. Purple-fleshed cultivars are culturally iconic in Okinawa, Japan (beni-imo), where they anchor traditional confections. Their color comes from acylated anthocyanins, reported at 55.7-143.4 mg/g dry weight, among the highest of any staple crop.
Frequently asked questions
Sources
- USDA FoodData Central, Sweet potato, raw (FDC ID 168482) — https://fdc.nal.usda.gov/food-details/168482/nutrients
- Escobar-Puentes et al. (2024) 'Proximate Composition, Health Benefits, and Food Applications in Bakery Products of Purple-Fleshed Sweet Potato (Ipomoea batatas L.) and Its By-Products: A Comprehensive Review', Foods — Table 1 proximate composition — https://pmc.ncbi.nlm.nih.gov/articles/PMC11351671/
- Nutritional Value and Antioxidant Capacity of Mexican purple sweet potato, Pol. J. Food Nutr. Sci. — moisture 60.80 g/100g — https://journal.pan.olsztyn.pl/pdf-195146-116530
- snapcalorie / USDA-derived purple sweet potato profile (support) — https://www.snapcalorie.com/nutrition/purple_sweet_potato_nutrition.html