This study compares a miniaturized spectrophotometer to benchtop and hand-held Vis-NIR instruments in the spectral range of 900–1700 nm for prediction of intramuscular fat (IMF) content of freeze-dried ground lamb meat; and their ability to differentiate fresh lamb meat based on animal age (4 vs 12 months). The performance of the miniaturized spectrophotometer was not affected by sample temperature equilibration time. Partial Least Square regression models for IMF showed R_cv² = 0.86–0.89 and RMSECV = 0.36–0.40 values for all instruments. Day-to-day instrumental variation adversely affected performance of the miniaturized spectrophotometer (R²_p = 0.27, RMSEP = 1.28). This negative effect was overcome by representing day-to-day variation in the model. The benchtop spectrophotometer and miniaturized spectrophotometer differentiated lamb meat by animal age. The miniaturized spectrophotometer has potential to be a fast, ultra-compact and cost-effective device for predicting IMF in freeze-dried ground lamb meat and for age classification of fresh lamb meat.

这项研究在900-1700 nm光谱范围内将微型分光光度计与台式和手持式Vis-NIR仪器进行了比较，以预测冻干碎羊肉的肌内脂肪（IMF）含量。以及根据动物年龄（4个月与12个月）区分新鲜羊肉的能力。微型分光光度计的性能不受样品温度平衡时间的影响。IMF的偏最小二乘回归模型显示 ，所有工具的R _cv ² = 0.86-0.89和RMSECV = 0.36-0.40。日常仪器变化会对微型分光光度计的性能产生不利影响（R ² _p = 0.27，RMSEP = 1.28）。通过代表模型中的日常变化，克服了这种负面影响。台式分光光度计和小型分光光度计可根据动物年龄区分羔羊肉。微型分光光度计有望成为一种快速，超紧凑且具有成本效益的设备，用于预测冻干碎羊肉中的IMF以及新鲜羊肉的年龄分类。