Food Science and Preservation (한국식품저장유통학회지)

The Korean Society of Food Preservation (한국식품저장유통학회)
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Effect of particle size of naked oat flours on physicochemical and antioxidant property

쌀귀리 가루의 입도별 이화학적 특성 및 항산화 활성

  • Jun, Hyun-Il (Department of Food Science and Technology, Chonbuk National University) ;
  • Yoo, Sun-Hee (Agricultural Technology Center) ;
  • Song, Geun-Seoup (Department of Food Science and Technology, Chonbuk National University) ;
  • Kim, Young-Soo (Department of Food Science and Technology, Chonbuk National University)
  • Received : 2017.11.09
  • Accepted : 2017.11.23
  • Published : 2017.11.30
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Abstract

This study was carried out to investigate the effect of particle size of naked oat flour (NOF) on physicochemical property and antioxidant activity. The NOF was passed through $250{\mu}m$ and $160{\mu}m$ size sieves to obtain three fractions (fraction A: $250{\mu}m$ or more, fraction B: $160-250{\mu}m$, and fraction C: $160{\mu}m$ or less). Moisture, crude protein, crude fat, and crude ash contents of NOF were 8.4, 15.7, 10.0, and 1.8%, respectively, and these contents were increased as the particle size of NOF decreased. The mineral and free amino acid contents of NOF also had a similar tendency. The contents of total starch, amylose, starch damage, total dietary fiber, ${\beta}$-glucan, total phenolics, and flavonoids in NOF were 56.4%, 21.4%, 11.7%, 11.0%, 4.7%, $237.8{\mu}g/g$ and $90.9{\mu}g/g$, respectively. As the particle size of NOF decreased, total starch, amylose, and starch damage contents increased, whereas total dietary fiber, ${\beta}$-glucan, total phenolic and flavonoid contents decreased. Also, three antioxidant activities of NOF were closely correlated with their total phenolics and flavonoids contents, showing high correlation coefficient values ($R^2=0.87$ and 0.81, respectively).

본 연구에서는 영양학적 가치가 높은 쌀귀리의 식품산업 이용률을 높이고자 쌀귀리를 입도별로 제조하여 이들의 이화학적 특성 및 항산화 활성을 비교하였다. 쌀귀리의 조단백질, 조지방 및 조회분 함량이 각각 15.7%, 10.0% 및 1.8%이었으며, 입도가 작아질수록 이들의 함량은 감소하였다. 주요 유리아미노산은 비필수아미노산 중에서는 cystine(58.3 mg%), ${\beta}$-aminoisobutyric acid(53.8 mg%) 등, 필수아미노산 중에서는 phenylalanine(8.6 mg%)과 histidine (12.2 mg%)이었으며, 입도가 작아질수록 함량은 감소하였다. 총 전분, 아밀로스, 손상전분, 총 식이섬유, ${\beta}$-glucan 및 총 유리당 함량은 각각 56.4%, 21.4%, 11.7%, 11.0%, 4.7% 및 2,555.3 mg%이었으며, 입도가 작아질수록 총 전분, 아밀로스 및 손상전분의 함량은 감소한 반면에 총 식이섬유와 ${\beta}$-glucan의 함량은 증가하였다. 색도는 L 값이 75.3, a 값이 0.3 및 b 값이 13.1이었으며, 입도가 작아질수록 L 값은 증가하였으나 a와 b 값은 감소하였다. 호화특성은 최고점도가 263.8 RVU, 최저점도가 155.6 RVU 및 최종점도가 399.3 RVU이었으며, 입도가 작아질수록 최고점도와 최종점도는 증가하였다. TPC, TFC 및 항산화 활성(DPPH radical assay, ABTS radical cation assay 및 reducing power)은 각각 $237.8{\mu}g/g$, $90.9{\mu}g/g$, 57.3%, 53.4% 및 0.23이었으며, 입도가 작아질수록 항산화 성분 및 항산화 활성은 감소하였다. 한편 TPC와 TFC에 관한 각 항산화 활성의 결정계수(correlation determination coefficient, $R^2$) 값이 각각 0.87 이상과 0.81 이상으로 나타나 항산화 성분과 항산화 활성은 상관성을 보였다.

Keywords

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