THE EFFECT OF THERMAL TREATMENT ON ANTIOXIDANT AND PHYSICOCHEMICAL PROPERTIES OF BLACK SHALLOT (ALLIUM ASCALONICUM)

Gia-Buu Tran; Thanh-Minh Thi Ngo

doi:10.11113/jurnalteknologi.v85.19244

Authors

Gia-Buu Tran ᵃFaculty of Pharmacy, Ton Duc Thang University, 19 Nguyen Huu Tho Street, Tan Phong Ward, District 7, Ho Chi Minh City, Vietnam ᵇInstitute of Biotechnology and Food-technology, Industrial University of Ho Chi Minh City, 12 Nguyen Van Bao Street, Go Vap District, Ho Chi Minh City, Vietnam https://orcid.org/0000-0001-7207-8120
Thanh-Minh Thi Ngo ᵇInstitute of Biotechnology and Food-technology, Industrial University of Ho Chi Minh City, 12 Nguyen Van Bao Street, Go Vap District, Ho Chi Minh City, Vietnam ᶜLaboratory of MICO-NAMBO Mining Chemical Industry Company Limited, Ben Dinh Quarter, My Xuan Ward, Phu My Township, Ba Ria-Vung Tau, Vietnam

DOI:

https://doi.org/10.11113/jurnalteknologi.v85.19244

Keywords:

Antioxidant activity, black shallot, physicochemical properties, polyphenols, thermal treatment

Abstract

Black shallot is the newly developed food product from shallot (Allium ascalonicum), which is characterized by dark brown color, sweet taste and jelly texture. However, the effect of thermal treatment on physicochemical properties, bioactive compounds, antioxidant activity has not been assessed yet. In this study, we determined the changes of some physicochemical properties (reducing sugar, pH, moisture, and acidity), polyphenols, and its antioxidant activity (via DPPH radical scavenging assay) during aging process at three different temperatures (60, 70, 80^oC) with sampling intervals 3 days for a 21-day period. All thermal treatment conditions gradually reduced the moisture and pH versus increased the acidity, reducing sugar, total polyphenol content, and antioxidant activity. The optimal conditions to produce the antioxidant and polyphenols - enriched black shallot were 70^oC for 18 days (63.95 ± 1.24 % and 52.86 ± 2.02 mg of GAE/g DW, respectively). These findings not only gives the basis for the optimization of processing for improvement food quality with desired attributes but also suggests black shallot as the promising source to extract bioactive compounds for application in pharmaceutical and food industry.

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