Abstract:
Effects of calcium ascorbate and edible coatings on browning and quality of fresh-cut rose apple cv. Tup Tim Jun were investigated.
Rose apple fruit were cooled at water (4 ํC) before cutting into four sections, followed by dipping of cold calcium ascorbate solution
(4 ํC) at the concentrations of 0, 2, 4 and 6% (w/v). The treated sections of fresh - cut rose apple were packed in foam tray and
wrapped with PVC film. The results found that fresh-cut rose apple sections treated with calcium ascorbate showed the delay of
browning, polyphenol oxidase activity (PPO), weight loss, ascorbic acid and flesh texture in comparison with non - treated sections.
But calcium ascorbate treatments had no significant effects in the changes of total phenolic compounds, total soluble solids, titratable
acidity, reducing sugar and, O2 and CO2 concentrations in the package among the treatments. Calcium ascorbate at 6% gave the best
results to maintain the quality of fresh-cut rose apple. The effects of cold whey protein concentrate (4 ํC) coating at 0 (control), 2.5, 5.0
and 7.5% (w/v) and cold chitosan (4 ํC) coating at 0 (control), 0.05, 0.10 and 0.20% (v/v) showed that chitosan coatings delayed
browning, L value, weight loss, total soluble solids, titratable acidity and reducing sugars of fresh-cut rose apple sections more than whey
protein concentrate coatings. Chitosan coating at 0.20% could delay weight loss and browning of fresh-cut rose apple sections more than
those of other treatments. Combined effects of cold 6% calcium ascorbate with 0.2% (v/v) chitosan (4 ํC) on the quality of fresh-cut rose
apple sections showed more effective to retard browning and delay PPO activity, weight loss and flesh texture than using calcium ascorbate
only and non-treatment respectively, and this treatment was able to maintain the qualities and prolong shelf - life of fresh - cut rose apple
sections for 5 days.
CO2 removal from biogas by novel micro bubble dissolving technology มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี
Thesis Committee : Prof. Dr. Navadol Laosiripojana Asst. Prof. Dr. Nutthachai Pongprasert Prof. Dr. Suttichai Assabumrungrat Assoc. Prof. Dr. Varit Srilaong Prof. Dr. Ratana Jiraratananon