Chemical properties of pineapple juice
The basic chemical characteristics of Queen pineapple juice are shown in Table 1. Based on the
results of analysis, TSS of Queen pineapple juice was relatively high (18.1°Brix) compared
with grape or other tropical fruit juices. The pH and TTA of pineapple juice were similar to
those of grape juice, being 2.8-3.8 and 0.6-0.8 (%w/v), respectively [16]. Additionally, nitrogen
content was adequate for yeast growth in the initial phase of fermentation, which should be
more than 0.025 gL-1 [17].. This indicated that the juice could be used as raw material for wine
fermentation since such condition of pineapple juice could allow yeast to grow and conduct
fermentation. However, the main organic acid of pineapple juice is citric acid, which differs
from grape juice. It is well known that tartaric acid is the main organic acid of grape juice. This
difference could affect the fermentation profiles of yeast species. Therefore, the fermentation
profile of the Queen pineapple juice was further evaluated