Color quality of rose liqueur
Date Issued
2005
Date
2005
Author(s)
Chao, Feng-Ting
DOI
zh-TW
Abstract
This thesis was to investigate the method of processing and the changes of compounds and colors during soaking of rose liqueur. The improving of color quality was emphasized.
During the soaking process, the amount of anthocyanins, the most important factor affecting the color of the liqueur, reached the maximum around the second day. Then, the quality of color declined with the increasing of soaking time especially browning. In order to improve the color quality of rose liqueur, the soaking time should not be longer than 2 days.
After oven-drying for 12 hours, the moisture content of rose petals decreased 20 %, but 90% of anthocyanins were able to retain. Drying can slow down the browning during soaking, and keep color quality of rose liqueur more effectively. Moreover, it decreases weight and volume of raw materials resulting in the reduction of the cost during transportation and storage. As a result, drying of rose petals as a preliminary treatment before manufacturing of rose liqueur is suggested.
From the study on the effects of pH, ethanol content and soaking time on color quality, it was found that browning during soaking can be slowed down by addition of 0.6 % citric acid. The concentration of anthocyanins increased with time and decrease with ethanol content; however, the degree of browning also increased with the increase in these factors. As a result, the optimal soaking conditions were as follows: soaking time of 24 hours; acidity at 1.8~2.0 %; and ethanol content of 55~60 %.
Subjects
玫瑰
浸漬酒
rose
liqueur
Type
thesis
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