Research Article

Simultaneous Recognition of Species, Quality Grades, and Multivariate Calibration of Antioxidant Activities for 12 Famous Green Teas Using Mid- and Near-Infrared Spectroscopy Coupled with Chemometrics

Table 4

The predictions of DPPH scavenging activities by OSWLS-SVM.

Prediction samplesActual DPPH scavenging activity (%)Recoveries (%)
MIRNIRFusion dataMIRNIRFusion data

136.0736.0736.0797.1100.7100.0
236.5336.2336.23100.0100.3100.0
336.0736.5335.80101.697.5103.5
436.5336.0736.2394.9101.3104.9
535.6536.2335.6598.2103.297.3
636.1636.5336.16100.099.8100.0
736.3435.6536.16100.0101.8100.0
836.1636.1636.16100.0100.198.2
935.6535.6535.6596.8102.499.2
1036.3436.1636.34101.399.199.2
1136.1647.8036.16100.0100.8100.0
1247.9248.0647.92100.0100.2100.0
1348.3848.3848.38100.0100.2100.9
1448.0648.0647.92100.099.499.6
1548.3848.1748.1796.598.0100.0
1640.0240.0240.02103.9101.6101.2
1740.3740.3740.37100.097.5100.0
1840.3240.3240.3295.8101.498.6
1940.2140.2140.21105.8100.399.6
2040.3740.3740.37103.396.8100.0
2148.6748.6748.67100.0103.3103.9
2249.0449.0449.0495.5100.699.7
2349.1648.6749.1697.6100.2100.0
2448.8149.0448.81100.090.5100.0
2549.2749.1649.27100.0101.6100.0
2635.1135.5235.11101.098.7100.0
2735.5235.7335.52100.098.396.4
2835.9235.9235.92100.097.6100.0
2935.3235.1135.32100.099.6100.0
3035.7335.3235.73103.599.1101.7
Correlation coefficient1.00000.99041.0000
Regression equationy = 0.9998x + 0.0001y = 0.9538x + 0.0173y = 0.9998x + 0.0001
Average recoveries (%)99.8 ± 2.599.7 ± 2.4100.1 ± 1.7
RMSECa5.7261 × 10−50.01226.4662
RMSEPb0.01000.01080.0065
T(t-test) = 2.0450.0841 < 0.0820 < 0.0441 <

aRMSEC denotes calibration root-mean-squared error, bRMSEP denotes prediction root-mean-squared error.