When boiling sugar solution, add some maltose or starch syrup, honey, etc., or add non sugar substances such as gelatin, pectin animal glue, egg white, etc., to slow down or inhibit sugar crystallization; increase acid content,<br>Keep the pH value of sugar solution between 2.5-3 to promote the transformation of sucrose; the storage temperature of preserved fruits and preserves should be 12-15 ℃, not lower than 10 ℃, and the relative humidity should be controlled below 70%; the storage temperature of preserved fruits and preserves should be 12-15 ℃, not lower than 10 ℃<br>For the preserved fruit that has been returned to sand, put it in 15% hot sugar solution and scald it again, then dry it<br>
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