Table 4.

Summary of NIR methods reported in the literature.

Product	Instrument	Mode	Spectral Range	Detector	No. of Scan	Accuracy	Ref.
Non-portable methods
Apples	In-house developed	Reflectance	800 to 1600 nm	Not specified	5 to 6	SEP = 0.7322 to 1.7809	[61]
Banana	In-house developed	Reflectance	600 to 870 nm	Photodiode bank	Not specified	97%	[46]
Pomegranate	dual-channel spectrometer,	Reflectance	400 to 1100 nm	Not specified	Not specified	R = 0.94	[44]
	AvaSpec-2048TEC					SEP = 0.24 ${}^{\circ }$Brix
Apples	Scanning Monochromator	Reflectance	400 to 2500 nm	Silicon	Not specified	R = 0.82	[47]
	Model 6500, NRISystems					SEP = 0.61 ${}^{\circ }$Brix
Sugarcane	FR, Spectroradiometer	Reflectance	350 to 2500 nm	Not specified	25	R2 = 0.76	[48]
Mandarin	CCD spectrometer	Transmittance	350 to 1040 nm	Photodiode array	Not specified	R = 0.92	[49]
	USB4000					SEP = 0.65 ${}^{\circ }$Brix
Portable Methods
Pineapple	In house developed	Reflectance	780, 850, 870, 910, and 940 nm	Photodiode	Not specified	80.56%	[50]
Tomato	In house developed	Reflectance	703 to 1124 nm	Photodiode array	Not specified	R = 0.92	[51]
Grapes	In house developed	Reflectance	640 to 1300 nm	Not specified	Not specified	R2 = 0.874 to 0.930	[52]
Oranges	In house developed	Reflectance	200 to 1100 nm	CCD	Not specified	R2 = 0.918	[53]
						SEP = 0.321 ${}^{\circ }$Brix
Sugarcane	vis/SW-NIRS,	Reflectance	325 to 1075 nm	Not specified	20	R = 0.87	[54]
	FieldSpec HandHeld					SEP = 1.45 ${}^{\circ }$Brix
Mango	Fruit Tester 20	Reflectance	600 to 1000 nm	Silicon diode array	30	R = 0.98	[55]
						SEP = 0.40 ${}^{\circ }$Brix
Nectarines	NIR-Gun, FANTEC	Reflectance	600 to 1100 nm	Silicon diode array	Not specified	R = 0.90	[56]
						SEP = 0.50 ${}^{\circ }$Brix

SEP: Square errors of prediction.