The effects of type and time of thermal processing on ginger (Zingiber officinale Roscoe) rhizome antioxidant compounds and its quality

Author : (1*) Hari Purnomo (2) Firman Jaya and (3) Simon Bambang Widjanarko

  1. Department of Animal Food Science and Technology, Faculty of Animal Husbandry, Brawijaya University, Malang, Jawa Timur, Indonesia
  2. Department of Animal Husbandry, Faculty of Agricultural Sciences and Nature Resources, Tribhuwana Tunggadewi University, Malang, Jawa Timur, Indonesia
  3. Department Food Technology, Faculty of Agricultural Technology, Brawijaya University, Malang, Jawa Timur, Indonesia

JAHEmadu

Abstract:  The type of thermal processing either roasting or boiling gave an effect on the antioxidant quality of ginger (Zingiber officinale Ross) rhizome extracts.It was found that 6 minutes of either roasting or boiling gave the best effect of its antioxidant activity. This condition was shown by the free radical activity of extract of roasted samples: 84.21 ± 0.18% and 83.59 ± 0.52% for the boiled one. The total phenolic content of roasted samples was 29.94 ± 0.15 mg/g and for boiled samples was 30.87 ± 0.26%, whilst its gingerol content of roasted samples was 19.84 ± 0.19 mg/g and 20.78 ± 0.14 mg/g for boiled samples. The results of GC-MS analysis showed that methyl ester (0,17%), 9-octadecenoic (0.32%), nortrachelogenin (0.30%) were the compounds of antioxidant agent. It is interesting to note that zingerone compound total area increased from 5.68% to 6.32%. The FTIR analysis showed that C-O-C antisym strecht vibration at 1270.04 cm-1 wave was found for methyl ester compound and OH stretch H-bonded at 2870.84 and 2982.71 cm-1 wave were found for 9-octadecenoic compound.
Keywords: Ginger rhizome (Zingiber officinale Roscoe), antioxidant compounds, antioxidant quality

Click here to download fulltext

Leave a comment

No comments yet.

Comments RSS TrackBack Identifier URI

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s