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Preparation and Characterization of Jochung, a Grain Syrup, with Apple

사과 첨가 조청의 제조 및 특성

  • Yang, Hye-Jin (Dept. of Food Science and Technology, Kongju National University) ;
  • Ryu, Gi-Hyung (Dept. of Food Science and Technology, Kongju National University)
  • Published : 2010.01.30

Abstract

This study was performed to investigate the effect of apple and maltitol as ingredients on the quality of Jochung, a grain syrup. Four kinds of Jochung products were prepared from steamed-rice, apple juice, heated-apple sarcocarp (at $70^{\circ}C$, 60 min), and a mixture (sarcocarp : maltitol=5:1, w/w) by saccharifying (at $55^{\circ}C$, 8 hrs) with a malt (100 g/500 g rice), mixing the ingredients (steamed-rice : ingredient=5:5, w/w), filtering, and heating the filtrate (at $95^{\circ}C$, 2 hrs): product (A) with apple juice added before saccharified, product (B) with apple juice added after saccharified, product (C) with heated-apple sarcocarp added after saccharified, and product (D) with the mixture added after saccharified. The product (D) had the lowest pH value ($4.60\pm0.01$) of any other products. The contents of reducing sugar and total phenolic compound were the highest in the product (A) among all the products, which comprised $68.10\pm6.71$% and $7.36\pm0.85$ mg/g, respectively, resulting in good quality. The solidity and the dextrose equivalence had the highest value in the product (B) and the product (C), respectively. The malic acid content ($4.10\pm0.02$%) of the product (D) was the highest of any other organic acids identified by HPLC. Hunter L, a, and b values of the product (D) were the highest compared to other products. In sensory evaluation, the product (A) had generally higher score in all sensory attributes. It was concluded from the chemical and sensory evaluation that adding the apple juice before saccharified might be an effective method for manufacturing good quality rice-Jochung.

본 연구에서는 사과의 이용성 증진과 새로운 전통식품의 소재화를 목적으로 최적조건을 설정하고자 전통적인 조청 제조공정에 사과를 첨가하여 품질특성(pH, 당고형분, 환원당, 포도당 당량, 총 페놀성 화합물, 색도, 유기산, 관능검사)을 측정하였다. 이를 위해서 사과와 멥쌀의 비, 사과의 성상과 투입단계에 따른 사과를 첨가한 조청을 예비실험을 통하여 제조하였으며, 사과즙액을 당화 전에 첨가한 조청(A)과 당화 후에 첨가한 조청(B), 사과청을 당화 후에 첨가한 조청(C)과 사과와 말티톨을 혼합하여 당화 후에 첨가한 조청(D)이다. 실험결과 pH는 식품공전의 엿류 규격기준(4.5~7.0) 범위에 모두 포함되었고, 사과즙액을 당화 전에 첨가한 조청인 A가 환원당 함량이 $68.10\pm6.71$%, 총 페놀성 화합물이 $7.36\pm0.85$ mg/g로 가장 높게 측정되었다. 당고형분 함량은 사과즙액을 당화 후에 첨가한 조청인 B가 $87.25\pm0.27$%로 가장 높게 측정되었으며, 포도당 당량은 사과청을 당화 후에 첨가한 조청인 C, 색도는 사과와 말티톨을 혼합하여 당화 후에 첨가한 조청인 D가 높게 측정되었다. 사과를 첨가한 조청의 유기산을 HPLC로 분석한 결과 주된 유기산은 malic acid였으며, A와 D에서 사과보다 많은 유기산이 함유되어 있는 것으로 보아 사과를 가공 처리한 후에도 유기산이 감소하지 않고 증가함을 확인할 수 있었다. 관능검사에서는 전체적으로 사과즙액을 첨가한 조청인 A가 높은 결과를 나타내었다. 결론적으로 사과를 첨가한 조청 제조 시 사과즙액을 당화 전에 첨가한 조청이 전체적인 기호도나 조청 고유의 품질에 좋은 영향을 주는 것으로 나타났으며, 사과가 갖는 장점 등을 조청에 적용할 수 있는 여러 가지 가능성을 확인할 수 있었다.

Keywords

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