근적외선 분광을 이용한 딸기의 당도예측모델 개발

손재룡¹^,^*, 이강진¹, 강석원¹, 양길모¹, 서영욱²

Development of Prediction Model for Sugar Content of Strawberry Using NIR Spectroscopy

Jaeryong Son¹^,^*, Kangjin Lee¹, Sukwon Kang¹, Gilmo Yang¹, Youngwook Seo²

¹농촌진흥청 국립농업과학원 농업공학부

²서울대학교 바이오시스템·소재학부

¹National Academy of Agricultural Science, RDA

²Department of Biosystems & Biomaterials Science and Engineering, Seoul National University

^*Corresponding author: Jaeryong Son, Researcher, National Academy of Agricultural Science, Suwon-city, Gyeonggi-do 441-100, Republic of Korea. Tel: +82-31-290-1901; Fax: +82-31-290-1900, E-mail: son1892@korea.kr

ⓒ Copyright 2009 Korean Society for Food Engineering. This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Received: May 04, 2009; Revised: Sep 21, 2009; Accepted: Nov 21, 2009

Published Online: Nov 30, 2009

Abatract

This study was performed to develop a prediction model of sugar content for strawberry. Near-infrared (NIR) spectroscopy has been prevailed for on-line and portable applications for non-invasive quality assessment of intact fruit. This work presents effects of illumination method and coating of reflection surface of light source on prediction result of sugar content. Effect of preprocessing methods was also examined. A low-cost commercially available VIS/ NIR spectrometer was used for estimation of total soluble solids content (Brix). To predict sugar contents of strawberry, the best results were obtained with the spectrum data measured under intensive illuminations at three locations induced from the light source with fiber optic bundles. Gold coating of reflection surface of light source lamp gave favorable effect to prediction result. The best results in validation of PLSR model were r_SEP = 0.891 and SEP = 0.443 Brix under OSC preprocessing and those of PCR were r_SEP = 0.845, SEP r_SEP= 0.520 Brix, under no preprocessing.

Keywords: NIR; non-destructive; strawberry; sugar content