Calcolatore Rapporto Zucchero-Marmellata — Formula
## How Jam Sugar Ratios Work
### The Standard Ratio
Traditional jam uses a 1:1 ratio of fruit to sugar by weight for high-pectin fruits, or slightly more sugar for low-pectin fruits. Modern recipes often reduce sugar.
### Why Sugar Matters
- **Preservation**: Sugar at 60%+ concentration inhibits microbial growth.
- **Gel formation**: Sugar interacts with pectin and acid to form the gel structure.
- **Flavor**: Balances the natural tartness of fruit.
### Pectin
High-pectin fruits (apples, citrus) gel easily with less sugar. Low-pectin fruits (strawberries, peaches) may need added pectin or more sugar to set.
### The Standard Ratio
Traditional jam uses a 1:1 ratio of fruit to sugar by weight for high-pectin fruits, or slightly more sugar for low-pectin fruits. Modern recipes often reduce sugar.
### Why Sugar Matters
- **Preservation**: Sugar at 60%+ concentration inhibits microbial growth.
- **Gel formation**: Sugar interacts with pectin and acid to form the gel structure.
- **Flavor**: Balances the natural tartness of fruit.
### Pectin
High-pectin fruits (apples, citrus) gel easily with less sugar. Low-pectin fruits (strawberries, peaches) may need added pectin or more sugar to set.
Esempio Risolto
Make jam with 1000 g of medium-pectin berries, standard sweetness.
- Base sugar ratio = 0.6 + (1 - 0.75) x 0.3 = 0.6 + 0.075 = 0.675.
- Sugar = 1000 x 0.675 x 1 = 675 g.
- Lemon juice = 1000 / 500 = 2 tbsp.
- Yield = (1000 + 675) x 0.6 = 1005 mL.
- Jars = ceil(1005 / 250) = 5 jars (250 mL each).