Sugars & Sweeteners
Lactose in gelato
Lactose is the natural disaccharide sugar of milk (glucose + galactose), sold as a fine anhydrous white powder that is roughly 100% sugar solids. In gelato it is a weak sweetener but a full-strength freezing-point depressant.
Balancing parameters
Per 100 g of product, verified against independent food-science sources (listed below).
| Parameter | Value |
|---|---|
| Total Solids | 100% |
| Water | 0% |
| Sugars | 100% |
| Fat | 0% |
| MSNF | 0% |
| Protein | 0% |
| POD (sweetening power) | 16 |
| PAC (anti-freezing power) | 100 |
Typical use: 0.5-2% of the total mix when added as pure powder; rarely used alone, since most lactose in gelato is contributed by milk and skim-milk powder.
Balance lactose in a real recipe
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Open the balancerHow to use it in gelato
Lactose delivers only about 16% of sucrose's sweetness (POD 16) yet, being a disaccharide of the same molar mass as sucrose, it has an identical anti-freezing power (PAC 100). This lets you add body, total solids and freezing-point control without making the mix noticeably sweeter, useful when a recipe is already at its sweetness ceiling but needs more solids or a softer scoop. Its major limitation is low solubility: lactose crystallizes readily, so excess in the mix (whether added directly or carried in by high milk-solids-non-fat) produces a gritty, 'sandy' texture. Keep total lactose, from all dairy sources, roughly below 9-10% of the water phase.
Origin & background
Lactose was first isolated from milk whey by the Italian physician Fabrizio Bartoletti in 1633 and named 'lactose' by the French chemist Jean-Baptiste Dumas in 1843. Today it is produced industrially by crystallizing it from whey permeate, a by-product of cheese manufacture, making it an abundant dairy-derived sweetener.
Frequently asked questions
Sources
- Nickerson, T.A. & Moore, E.E. (1983). Effects on Freezing Point of Carbohydrates Commonly Used in Frozen Desserts. Journal of Dairy Science: https://www.journalofdairyscience.org/article/S0022-0302(83)82112-2/pdf — reports lactose freezing-point-depression factor 1.00 relative to sucrose (i.e., PAC 100).
- Ice Ice Daddy — Sugar expert / sugars for sorbets and ice creams: https://www.iceicedaddy.com/en/sugar_expert.php — states lactose 'has a POD of 16 and a PAC of 100'.
- Under-belly.org — Sugars in Ice Cream: https://under-belly.org/sugars-in-ice-cream/ — technical reference on sugar POD/PAC and lactose's low sweetness / sandiness risk.
- Ecco un poco — Sugars in gelato: https://www.eccounpoco.com/blog/sugars-in-gelato — notes excess lactose causes a 'sandy' gelato defect.
- Lumen Learning / SUNY Organic & Biochemistry — Disaccharides: https://courses.lumenlearning.com/suny-orgbiochemistry/chapter/disaccharides/ — lactose relative sweetness ~16% of sucrose and MW 342 g/mol.