Table 4 Antioxidant properties, antioxidant activity and regression analysis of hypogeal germinated brown rice

(h)

(%)

(%)

(mMolFe²⁺)

(mgGAE/g)

(MgRUTIN/g)

1

10

0(−1)

35.30 ± 0.84

52.99 ± 0.29

0.054 ± 0.002

0.770 ± 0.005

50.63 ± 0.92

2

2

0(−1)

36.00 ± 0.21

52.99 ± 0.71

0.054 ± 0.001

0.770 ± 0.003

50.63 ± 0.48

3

3

18(−0.5)

37.01 ± 0.14

46.06 ± 0.32

0.096 ± 0.001

0.657 ± 0.004

45.08 ± 0.32

4

9

54(0.5)

40.85 ± 0.32

47.61 ± 0.47

0.121 ± 0.003

0.671 ± 0.006

45.10 ± 0.14

5

7

72(1)

43.60 ± 0.12

56.10 ± 0.46

0.106 ± 0.002

0.798 ± 0.002

50.17 ± 0.74

6

4

72(1)

43.60 ± 0.11

56.10 ± 0.38

0.106 ± 0.004

0.798 ± 0.009

50.17 ± 0.61

7

5

36(0)

38.80 ± 0.31

44.28 ± 0.14

0.118 ± 0.001

0.624 ± 0.004

43.47 ± 0.18

8

6

36(0)

38.00 ± 0.42

44.28 ± 0.73

0.118 ± 0.003

0.624 ± 0.006

43.47 ± 0.43

9

8

36(0)

38.00 ± 0.15

44.28 ± 0.28

0.119 ± 0.002

0.624 ± 0.003

43.47 ± 0.54

10

1

36(0)

38.00 ± 0.21

44.30 ± 0.51

0.118 ± 0.002

0.623 ± 0.005

43.88 ± 0.31

(b) Model Terms

DPPH

MCA

FRAP

TPC

TFC

Model

< 0.0001

< 0.0001

< 0.0001

< 0.0001

< 0.0001

h

< 0.0001

< 0.0001

< 0.0001

< 0.0001

0.0421

h²

0.0011

< 0.0001

< 0.0001

< 0.0001

< 0.0001

Lack of fit

0.5135

0.4332

0.7427

0.8416

0.2886

R²

0.9874

0.9990

0.9999

0.9999

0.9979

Adj. R²

0.9839

0.9998

0.9998

0.9998

0.9973

Pred. R²

0.9742

0.9998

0.9998

0.998

0.9967

Ad. Prec.

39.33

2365.02

353.46

1197.75

74.71

CV (%)

0.94

0.02

0.34

0.04

0.37

Std. Dev.

0.37

0.01

< 0.01

< 0.01

0.17