Development of a Carbonated Guyabano Juice

Soda is said to have “empty calories.” Thus, a healthier carbonated beverage was produced using guyabano, which is rich in vitamins, minerals, and flavonoids. Guyabano syrup was prepared with sugar, water, guyabano juice, and calamansi juice. To optimize the final product, guyabano syrup was mixed with carbonated water in three ratios, namely, 2:17, 3:17, and 4:17. From a preference ranking test, formulations with 3:17 and 4:17 ratio were not significantly different, but the latter was chosen for the succeeding tests based on its low rank sum. A consumer acceptability test showed that panelists “moderately liked” the appearance, taste, and sweetness of the product. On the other hand, aroma, carbonation, and the overall acceptability were “liked very much.” Physicochemical properties of guyabano juice, guyabano syrup, and carbonated guyabano juice were determined. The pure guyabano juice had 4.21 pH, 0.94% malic acid, and 15 °Bx while the guyabano syrup had a pH of 3.97, 0.69% malic acid, and 46.26 °Bx. The pH, TTA (total titratable acidity), and TSS (total soluble solids) of the finished product were 3.80, 0.21%, and 10.37 °Bx, respectively. An antioxidant capacity assay showed that the carbonated guyabano juice had 0.131 mg ascorbic acid equivalent-mL-1. There was no significant change in pH and TTA after one week storage at ambient temperature. However, yeast and mold count significantly increased and TSS significantly decreased. Thus, it is recommended that the developed carbonated guyabano juice be stored at refrigerated temperature or added with a suitable preservative

Knowledge Practices Traversing Nature/Culture Divide: Recent Themes in Social Studies

This paper maps the various forms of disciplinal links that are presently evolving between the natural and social sciences. The first part reflects on the effects of disciplinal diversification on the traditionally demarcated domains—natural/social sciences—and on their conceptual foundation—nature/culture binary. It gives a partial review of recent perspectives that may be of interest to those constructing ways of strengthening disciplinal networking. The second part is an extended reflection on locating locally some of the interesting themes in constructing knowledge beyond the nature/culture divide