Evaluation of Freshness of Ground Pork Tenderloin by Visible/Near Infrared Spectroscopy
CHEN-HUANG CHOU1, CHU-YING LOU CHYR2, RICHIE L. C. CHEN1 AND JAI-TSUNG SHAW1*
1. Department of Bio-Industrial Mechatronics Engineering, National Taiwan University, Taipei 106, Taiwan, R.O.C.
2. Department of Animal Science and Technology, National Taiwan University, Taipei 106, Taiwan, R.O.C.
(Received: March 25, 2009; Accepted: February 23, 2010)
ABSTRACT
Visible/near-infrared transmittance spectra (600-1368 nm) of the aqueous extracts of 120 ground pork tenderloin samples from Taiwan black-hair hogs were used to correlate with the freshness-relating data including pH, volatile basic nitrogen and aerobic plate count during 7°C storage for 5 days. The spectra in 600-840 nm regions varied during storage with the data highly correlated with the freshness parameters. Four characteristic wavelengths (608, 624, 656 and 732 nm) were selected for freshness evaluation based on partial least square regression (PLSR) model using different freshness criteria for dummy regression. The accuracies of freshness evaluation can reach 90% with the PLSR models excluding the data in Day 3.
Key words: aerobic plate count, chemometrics, freshness, pH, PLSR, pork tenderloin, volatile basic nitrogen
Visible/near-infrared transmittance spectra (600-1368 nm) of the aqueous extracts of 120 ground pork tenderloin samples from Taiwan black-hair hogs were used to correlate with the freshness-relating data including pH, volatile basic nitrogen and aerobic plate count during 7°C storage for 5 days. The spectra in 600-840 nm regions varied during storage with the data highly correlated with the freshness parameters. Four characteristic wavelengths (608, 624, 656 and 732 nm) were selected for freshness evaluation based on partial least square regression (PLSR) model using different freshness criteria for dummy regression. The accuracies of freshness evaluation can reach 90% with the PLSR models excluding the data in Day 3.Key words: aerobic plate count, chemometrics, freshness, pH, PLSR, pork tenderloin, volatile basic nitrogen