Pengembangan Bromfenol Biru dan Bromtimol Biru pada Label Pintar Sensor Kematangan Buah Naga Merah (Hylocereus polyrhizus)
ABSTRACT: The novel on-package
color indicator label has been fabricated based on bromophenol blue and mixture
between bromophenol blue and bromothymol blue, and tests have been conducted to
assess the ripeness of red dragon fruit (Hylocereus polyrhizus). Bromophenol
blue (BPB) and mixture between bromophenol blue and bromothymol blue (BTB) were
immobilized onto acetate cellulose membrane via adsorption method. The BPB and
mixture between BPB and BTB/acetate cellulose membrane as color indicator work
based on pH decrease as the volatile organic compounds (e.g. acetic acid). They
produced gradually in the package headspace during developing of red dragon
fruit. Subsequently, the color of the indicator will change from blue to green
for over-ripe indication, which can be visible visually. The results showed
that the color indicator could be used to determine the state of ripeness of
the red dragon at ambient condition (25±2oC) and chiller condition (4±2oC). The
color change of the indicators reflects the pH of headspace of the red dragon
packaging. Furthermore, it also in similar trends to the change of several
parameters (soluble solids content, pH, texture, sensory evaluation and weight
loss) that normally used to characterize the ripeness of red dragon, therefore
the indicator can be used for real time visual monitoring of ripeness state of
packaged red dragon fruit.
Keywords: ripeness indicator,
BPB, BTB, red dragon fruit, acetate cellulose membrane
Penulis: Raden Ayu Rifqa
Zainatul Hurriyah, Bambang Kuswandi, Dwi Koko Pratoko
Kode Jurnal: jpkesmasdd170092