Comparison of Chromatic and Spectrophotometric Properties of White and Red Wines Produced in Galicia (Northwest Spain) by Applying PCA
Abstract
:1. Introduction
2. Results and Discussion
2.1. Spectrophotometric Determinations
2.2. Principal Component Analysis
2.2.1. Principal Component Analysis in Red Wines
2.2.2. Principal Component Analysis in White Wines
3. Materials and Methods
3.1. Wine Samples
3.2. Analytical Methods
3.2.1. Color Determinations
3.2.2. Polyphenolic Determinations
3.2.3. Anthocyan Determination
3.2.4. Tannin Determination
3.3. Statistical Analysis
4. Conclusions
Supplementary Materials
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Denomination of Origin | Monterrei | Rías Baixas | Ribeira Sacra | Ribeiro | Valdeorras | TOTAL |
---|---|---|---|---|---|---|
Surface (ha) | 631 | 4170 | 2500 | 2500 | 1087 | 10,888 |
Viticultors | 365 | 5550 | 3000 | 1667 | 1975 | 12,557 |
Wineries | 27 | 179 | 96 | 103 | 45 | 450 |
Grape production 2021 (kg) | 6,232,189 | 43,809,134 | 6,541,212 | 9,957,657 | 7,107,426 | 73,647,618 |
Liter/Winery | 121,333.3 | 166,480.4 | 44,870.8 | 82,432.0 | 84,617.7 | 110,404.2 |
Liter/Viticultor | 8975.3 | 5369.4 | 1435.9 | 5093.3 | 1928 | 3956.5 |
Surface/Viticultor | 1.73 | 0.751 | 0.833 | 1.50 | 0.55 | 0.867 |
Winery surface | 23.37 | 23.29 | 26.04 | 24.27 | 24.16 | 24.20 |
Wine production 2021 (hL) | 32,760 * | 298,000 | 43,076 | 84,905 * | 38,078 | 496,819 |
Wine production 2010 (hL) | 8466 | 160,665 | 30,758 | 82,816 | 30,848 | 313,553 |
% Increased hL | 74.15 | 46.08 | 28.61 | 2.46 | 18.99 | 36.89 |
Wine Codes | Color | CIELab | Total Polyphenols | Anthocyans (mg Malvidin/L) | Tannins (g Cyanidin/L) | |||
---|---|---|---|---|---|---|---|---|
CI | Tint | L | C | TPI | FCI | |||
R1 | 8.25 bcde | 63.10 z | 95.89 ab | 10.48 t | 59.0 defghijkl | 63.6 klmnop | 15.81 cd | 4.11 efghijklm |
R2 | 8.60 bcd | 61.69 z | 92.08 c | 3.17 vw | 56.6 hijklm | 93.0 defgh | 12.24 cd | 1.21 ijklm |
R3 | 7.04 cde | 460.90 ef | 31.61 mnopq | 20.84 nopqr | 53.4 klmnop | 98.7 cdefg | 11.37 cd | 1.93 hijklm |
R4 | 8.18 bcde | 511.70 b | 33.79 mn | 27.30 fghijklm | 55.2 ijklmno | 142.4 a | 4.90 de | 14.7 abc |
R5 | 12.34 a | 96.64 tu | 29.52 opqr | 16.41 rs | 75.0 ab | 60.7 klmnopq | 9.70 cd | 4.83 efghijkl |
R6 | 7.28 cde | 96.47 tu | 30.89 mnopqr | 22.94 klmnopq | 67.1 bcdefgh | 73.0 hijklm | 13.81 cd | 8.46 cdefghijkl |
R7 | 7.58 bcde | 85.40 wx | 29.92 nopqr | 23.12 klmnopq | 75.0 ab | 71.3 hijklm | 9.63 cd | 2.66 ghijklm |
R8 | 7.65 bcde | 63.18 z | 97.88 a | 2.36 w | 55.8 ijklmn | 125.5 b | 20.63 bc | 2.17 hijklm |
R9 | 6.38 cdef | 433.33 g | 30.41 mnopqr | 20.30 opqr | 56.8 ghijklm | 113.9 bcd | 11.63 cd | 11.1 abcdefg |
R10 | 7.16 cde | 520.95 a | 32.13 mnopqr | 29.88 defghij | 59.2 defghijkl | 72.8 hijklm | 10.46 cd | 0.72 klm |
R11 | 6.79 cde | 89.26 vw | 31.01 mnopqr | 24.52 ijklmnop | 70.2 abcd | 63.7 klmnop | 6.29 cde | 5.80 defghijkl |
R12 | 7.49 bcde | 62.50 z | 96.42 a | 8.72 tuv | 56.6 hijklm | 90.5 defghi | 12.63 cd | 3.38 fghijklm |
R13 | 6.65 cdef | 455.63 f | 33.54 mno | 30.56 cdefgh | 55.1 jklmno | 70.8 hijklm | 11.16 cd | 2.90 ghijklm |
R14 | 7.64 bcde | 491.81 d | 32.79 mno | 29.11 efghij | 56.7 ghijklm | 108.4 bcde | 10.55 cd | 2.66 ghijklm |
R15 | 10.12 ab | 97.51 tu | 31.81 mnopq | 24.30 jklmnop | 69.1 abcde | 70.9 hijklm | 9.90 cd | 11.8 abcdef |
R16 | 5.91 ef | 85.40 wx | 31.40 mnopqr | 27.39 fghijklm | 69.5 abcde | 73.5 hijklm | 10.11 cd | 0.48 klm |
R17 | 7.47 bcde | 61.78 z | 97.93 a | 9.08 tu | 54.0 klmnop | 104.5 bcdef | 11.59 cd | 3.14 ghijklm |
R18 | 6.34 cdef | 438.10 g | 33.54 mno | 31.92 bcdefg | 55.2 ijklmno | 91.0 defghi | 11.16 cd | 3.62 efghijklm |
R19 | 6.71 cdef | 485.03 d | 32.50 mnop | 29.61 defghij | 58.3 efghijklm | 100.2 cdefg | 12.46 cd | 3.87 efghijklm |
R20 | 8.76 bc | 91.41 uv | 30.51 mnopqr | 26.48 ghijklmn | 68.8 abcdef | 77.1 ghijkl | 8.07 cd | 9.42 cdefghij |
R21 | 8.07 bcde | 62.43 z | 95.48 ab | 9.26 t | 53.1 klmnop | 66.8 jklmn | 15.16 cd | 0.24 klm |
R22 | 6.07 cdef | 485.38 d | 32.22 mnopq | 27.61 fghijklm | 55.8 ijklmn | 71.8 hijklm | 14.72 cd | 2.66 ghijklm |
R23 | 6.71 cdef | 503.47 c | 32.58 mno | 31.27 cdefg | 57.6 fghijklm | 83.7 fghijk | 12.33 cd | 0.48 klm |
R24 | 8.27 bcde | 94.56 uv | 30.64 mnopqr | 24.78 ijklmno | 67.9 abcdefg | 72.1 hijklm | 4.46 de | 8.70 cdefghijk |
R25 | 10.08 ab | 87.35 w | 30.83 mnopqr | 24.60 ijklmno | 69.4 abcde | 65.9 jklmn | 9.16 cd | N.D. m |
R26 | 6.41 cdef | 486.13 d | 32.54 mnop | 28.11 fghijk | 56.4 hijklm | 77.7 ghijkl | 13.16 cd | 7.25 cdefghijkl |
R27 | 8.07 bcde | 509.52 bc | 30.23 mnopqr | 18.36 qr | 59.5 defghijkl | 102.3 bcdef | N.D. e | 3.38 fghijklm |
R28 | 8.60 bcd | 506.99 bc | 38.94 l | 29.41 defghij | 38.1 qr | 59.6 lmnopq | 0.55 de | 0.97 ijklm |
R29 | 8.27 bcde | 94.56 uv | 27.48 r | 7.41 tvw | 66.4 bcdefghi | 58.5 lmnopq | 10.59 cd | 4.35 efghijkl |
R30 | 8.44 bcde | 86.52 wx | 30.65 mnopqr | 21.84 lmnopqr | 63.9 bcdefghijk | 69.0 ijklm | 7.03 cde | 12.1 abcde |
R31 | 6.49 cdef | 511.11 b | 32.74 mno | 30.14 defghi | 56.9 ghijklm | 88.1 efghij | 15.37 cd | 3.14 ghijklm |
R32 | 7.64 bcde | 463.95 e | 32.27 mnop | 27.63 fghijkl | 54.6 jklmnop | 118.1 bc | 10.37 cd | 3.62 efghijklm |
R33 | 5.72 ef | 416.06 h | 45.13 ghij | 29.03 efghij | 52.7 klmnop | 113.2 bcd | N.D. e | 4.59 efghijkl |
R34 | N.A. h | N.A. α | 39.96 kl | 30.64 cdefgh | 44.9 nopq | 55.8 lmnopq | N.D. e | N.D. m |
R35 | 4.02 fg | 96.86 tu | 41.94 jkl | 30.88 cdefgh | 44.9 nopq | 69.0 ijklm | N.D. e | 3.38 fghijklm |
R36 | 0.53 h | 126.24 m | 50.49 f | 35.10 bcd | 44.8 nopq | 40.6 pqrst | N.D. e | 3.87 efghijklm |
R37 | 0.58 h | 119.72 no | 46.21 ghi | 34.04 bcde | 47.3 mnopq | 44.8 nopqrs | N.D. e | 7.01 cdefghijkl |
R38 | 0.49 h | 160.13 j | 56.56 e | 35.05 bcd | 43.6 pqr | 37.8 qrstu | N.D. e | 2.17 hijklm |
R39 | 0.51 h | 136.87 l | 48.36 fg | 32.65 bcdef | 50.8 lmnop | 43.9 nopqrs | N.D. e | 6.52 cdefghijkl |
R40 | 1.04 h | 112.94 opqr | 33.33 mno | 23.68 klmnopq | 68.7 abcdef | 60.8 klmnopq | 8.29 cd | 5.80 defghijkl |
R41 | 1.84 gh | 114.51 nopq | 31.01 mnopqr | 21.29 nopqr | 78.5 a | 77.0 ghijkl | 8.07 cd | 18.8 ab |
R42 | 0.71 h | 132.02 l | 42.43 ijkl | 35.77 abc | 51.2 lmnop | 59.0 lmnopq | N.D. e | 1.93 hijklm |
R43 | 1.44 gh | 108.78 pqr | 30.30 mnopqr | 18.75 pqr | 72.5 abc | 95.3 cdefgh | 9.81 cd | 2.17 hijklm |
R44 | 0.56 h | 147.96 k | 47.58 fgh | 37.53 ab | 55.2 ijklmno | 64.9 jklmno | N.D. e | 6.04 defghijkl |
R45 | 0.80 h | 108.41 qrs | 43.13 hijk | 34.22 bcde | 36.4 qr | 20.6 tu | 0.42 de | 4.59 efghijkl |
R46 | 0.59 h | 107.47 rs | 43.67 hijk | 34.34 bcde | 37.8 qr | 22.4 stu | 1.81 de | 4.11 efghijklm |
R47 | 2.48 gh | 62.97 z | 28.21 qr | 10.51 t | 65.5 bcdefghij | 41.3 opqrst | 44.11 a | 14.0 abcd |
R48 | 2.40 gh | 65.58 z | 28.50 pqr | 11.97 st | 63.2 cdefghijk | 37.7 qrstu | 31.50 ab | 4.35 efghijkl |
R49 | 0.91 h | 79.86 xy | 34.06 m | 31.74 bcdefg | 44.1 opqr | 31.0 rstu | 7.03 cde | 9.67 cdefghi |
R50 | 0.92 h | 77.93 y | 33.67 mn | 29.45 defghij | 68.1 abcdef | 31.6 rstu | 7.03 cde | 10.4 bcdefgh |
R51 | 0.86 h | 101.91 st | 39.05 l | 32.92 bcdef | 50.4 lmnop | 25.1 stu | N.D. e | 2.90 ghijklm |
R52 | 0.72 h | 134.22 l | 46.61 fgh | 30.99 cdefgh | 37.8 qr | 18.8 tu | N.D. e | 5.56 defghijkl |
R53 | 0.75 h | 127.30 m | 40.22 kl | 31.52 cdefg | 51.5 lmnop | 23.9 stu | N.D. e | 6.04 defghijkl |
R54 | 0.47 h | 170.00 i | 84.48 d | 41.06 a | 32.9 r | 16.0 u | N.D. e | N.D. m |
R55 | 0.70 h | 118.71 no | 38.61 l | 31.74 bcdefg | 44.1 opqr | 23.2 stu | N.D. e | 1.69 ijklm |
R56 | 1.36 gh | 108.02 qrs | 32.56 mno | 25.30 hijklmno | 68.1 abcdef | 50.4 mnopqr | 2.94 de | 6.04 defghijkl |
R57 | 1.38 gh | 120.58 mn | 33.11 mno | 22.70 klmnopq | 69.6 abcd | 61.9 klmnop | 2.07 de | 10.9 abcdefg |
R58 | 0.70 h | 115.41 nop | 41.07 kl | 31.39 cdefg | 47.2 mnopq | 19.1 tu | 14.00 cd | 19.1 a |
Wine Codes | Color | CIELab | Total Polyphenols | Anthocyans (mg Malvidin/L) | Tannins (g Cyanidin/L) | |||
---|---|---|---|---|---|---|---|---|
CI | Tint | L | C | TPI | FCI | |||
W1 | 0.34 a | 182.42 qrst | 101.50 abc | 7.74 kl | 6.90 efgh | 27.7 a | N.D. c | N.D. a |
W2 | 0.33 a | 192.13 nop | 102.32 ab | 7.61 l | 6.46 gh | 19.5 ab | N.D. c | N.D. a |
W3 | 0.46 a | 169.92 uv | 102.15 ab | 8.12 jkl | 6.78 efgh | 16.2 b | N.D. c | N.D. a |
W4 | 0.41 a | 189.38 pq | 102.20 ab | 7.61 l | 7.01 efgh | 17.8 b | N.D. c | 0.106 a |
W5 | 0.39 a | 185.85 pqrs | 102.36 ab | 8.00 jkl | 6.72 efgh | 14.8 b | 2.84 bc | 0.087 a |
W6 | 0.33 a | 185.56 pqrs | 102.50 ab | 7.48 l | 6.85 efgh | 16.9 b | 8.31 abc | 0.126 a |
W7 | 0.34 a | 187.23 pqr | 101.93 abc | 7.89 jkl | 6.64 efgh | 17.0 b | N.D. c | 0.010 a |
W8 | 0.38 a | 176.85 tu | 101.72 abc | 8.24 jkl | 6.75 efgh | 16.9 b | 0.22 c | N.D. a |
W9 | 0.34 a | 185.87 pqrs | 101.65 abc | 8.19 jkl | 6.22 h | 15.1 b | 5.25 bc | 0.145 a |
W10 | 0.34 a | 158.10 wx | 102.51 ab | 8.13 jkl | 6.54 fgh | 15.8 b | 5.91 sbc | N.D. a |
W11 | 0.34 a | 169.31 v | 102.20 ab | 8.52 jkl | 6.83 efgh | 17.4 b | N.D. c | N.D. a |
W12 | 0.48 a | 181.16 rst | 101.35 abc | 8.77 jkl | 6.91 efgh | 15.7 b | 3.28 bc | N.D. a |
W13 | 0.413 a | 171.07 uv | 101.96 abc | 8.63 jkl | 7.74 defgh | 16.7 b | 3.94 bc | 0.039 a |
W14 | 0.39 a | 159.83 wx | 102.43 ab | 6.56 l | 6.09 h | 16.6 b | 2.41 bc | 0.097 a |
W15 | 0.38 a | 157.39 x | 101.51 abc | 7.44 l | 6.77 efgh | 15.9 b | 8.31 abc | 0.155 a |
W16 | 0.45 a | 154.68 x | 102.20 ab | 7.53 l | 6.90 efgh | 17.7 b | 7.66 abc | 0.077 a |
W17 | 0.48 a | 164.79 vw | 101.42 abc | 8.03 jkl | 6.92 efgh | 16.5 b | 4.38 bc | N.D. a |
W18 | 1.49 a | 223.34 hi | 94.54 e | 28.47 a | 11.91 cdefgh | 14.2 b | 1.31 bc | 0.116 a |
W19 | 0.79 a | 254.64 de | 96.16 de | 3.26 m | 8.40 cdefgh | 13.8 b | 8.75 abc | 0.271 a |
W20 | 0.90 a | 245.78 f | 101.24 abc | 17.44 fgh | 10.20 cdefgh | 13.8 b | 1.75 bc | 0.329 a |
W21 | 0.96 a | 265.94 bc | 97.51 cde | 18.83 efg | 10.04 cdefgh | 13.9 b | N.D. c | 0.280 a |
W22 | 0.89 a | 258.80 c | 101.29 abc | 17.19 gh | 8.37 cdefgh | 14.1 b | N.D. c | N.D. a |
W23 | 0.71 a | 235.48 g | 101.52 abc | 17.18 gh | 10.17 cdefgh | 15.4 b | 7.00 abc | N.D. a |
W24 | 1.07 a | 216.72 ij | 98.58 abcde | 23.99 c | 12.66 cdefg | 15.1 b | N.D. c | N.D. a |
W25 | 0.61 a | 229.87 gh | 101.46 abc | 13.72 i | 11.16 cdefgh | 16.6 b | 2.63 bc | N.D. a |
W26 | 0.98 a | 208.46 kl | 99.82 abcd | 19.84 def | 11.96 cdefgh | 15.6 b | N.D. c | 0.290 a |
W27 | 0.95 a | 230.95 g | 99.01 abcde | 17.47 fgh | 11.10 cdefgh | 15.4 b | 2.63 bc | 0.222 a |
W28 | 0.79 a | 249.25 ef | 99.73 abcd | 18.38 fgh | 12.23 cdefgh | 14.8 b | 9.19 ab | N.D. a |
W29 | 0.96 a | 214.23 jk | 99.09 abcde | 21.05 de | 12.00 cdefgh | 15.8 b | N.D. c | N.D. a |
W30 | 0.81 a | 132.94 y | 102.58 ab | 10.42 j | 12.74 cdef | 14.3 b | N.D. c | 0.232 a |
W31 | 1.31 a | 179.08 st | 100.44 abcd | 21.53 d | 13.44 cd | 15.8 b | N.D. c | 0.155 a |
W32 | 1.15 a | 211.04 jk | 98.57 abcde | 25.45 b | 12.83 cde | 14.9 b | N.D. c | 0.164 a |
W33 | 0.64 a | 257.24 d | 103.00 a | 16.22 h | 13.29 cd | 15.2 b | 3.06 bc | 0.048 a |
W34 | 0.59 a | 280.60 a | 101.99 abc | 16.54 gh | 13.29 cd | 16.1 b | 14.44 a | 0.135 a |
W35 | 0.99 a | 191.07 op | N.A. f | N.A. n | 12.05 cdefgh | 14.6 b | N.D. c | N.D. a |
W36 | 0.93 a | 264.78 bc | 99.37 abcd | 21.62 d | 12.20 cdefgh | 15.7 b | N.D. c | 0.174 a |
W37 | 1.19 a | 198.42 mn | 101.44 abc | 18.73 efgh | 25.13 b | 17.2 b | 2.19 bc | N.D. a |
W38 | 0.58 a | 201.97 lm | 99.76 abcd | 3.85 m | 10.52 cdefgh | 14.0 b | 2.19 bc | N.D. a |
W39 | 1.48 a | 214.70 jk | 96.01 de | 10.30 jk | 14.15 c | 20.8 ab | 5.25 bc | N.D. a |
W40 | 1.00 a | 197.77 mno | 98.30 bcde | 2.09 m | 27.02 b | 15.6 b | N.D. c | 0.106 a |
W41 | 0.63 a | 271.92 b | 102.57 ab | 17.47 fgh | 36.05 a | 14.2 b | N.D. c | 0.087 a |
Wine | Code | Treatment | Variety |
---|---|---|---|
Control without wood-contact (steel tank) | R1 | Without wood-contact (0 month) | Mencía |
R2 | Without wood-contact (after 3 months) | ||
R3 | Without wood-contact (after 6 months) | ||
R4 | Without wood-contact (after 9 months) | ||
R5 | Without wood-contact (after 12 months) | ||
R6 | Without wood-contact | ||
Tonnellerie-1 (French oak) | R7 | Without wood-contact | Mencía |
R8 | Wood-contact (during 3 months) | ||
R9 | Wood-contact (during 5 months) | ||
R10 | Wood-contact (during 7 months) | ||
R11 | Wood-contact (during 12 months) | ||
Tonnellerie-2 (French oak) | R12 | Wood-contact (during 3 months) | Mencía |
R13 | Wood-contact (during 5 months) | ||
R14 | Wood-contact (during 7 months) | ||
R15 | Wood-contact (during 9 months) | ||
R16 | Wood-contact (during 12 months) | ||
Tonnellerie-3 (French oak) | R17 | Wood-contact (during 3 months) | Mencía |
R18 | Wood-contact (during 5 months) | ||
R19 | Wood-contact (during 7 months) | ||
R20 | Wood-contact (during 12 months) | ||
Tonnellerie-4 (French oak) | R21 | Wood-contact (during 3 months) | Mencía |
R22 | Wood-contact (during 5 months) | ||
R23 | Wood-contact (during 7 months) | ||
R24 | Wood-contact (during 9 months) | ||
R25 | Wood-contact (during 12 months) | ||
Chip-1 (French oak) | R26 | Wood-contact (during 3 months) | Mencía |
R27 | Wood-contact (during 5 months) | ||
R28 | Wood-contact (during 7 months) | ||
R29 | Wood-contact (during 9 months) | ||
R30 | Wood-contact (during 12 months) | ||
Chip-2 (American oak) | R31 | Wood-contact (during 3 months) | Mencía |
R32 | Wood-contact (during 5 months) | ||
R33 | Wood-contact (during 7 months) | ||
R34 | Wood-contact (during 9 months) | ||
R35 | Wood-contact (during 12 months) | ||
Commercial wines | R36 | N.S. | Merenzao |
R37–R40 | N.S. | Sousón | |
R41–R44 | N.S. | Brancellao | |
R45 | N.S. | Merenzao | |
R46–R48 | N.S. | Sousón | |
R49 | N.S. | Brancellao | |
R50–R51 | N.S. | Mencía | |
R52–R53 | N.S. | Brancellao, Ferrol, Caíño longo and Caíño redondo | |
R54 | N.S. | Caíño tinto, Sousón and Brancellao | |
R55 | N.S. | Mencía | |
R56 | N.S. | Mencía, Merenzao and Garnacha | |
R57–R58 | N.S. | Mencía |
Wine | Code | Treatment | Variety |
---|---|---|---|
Oak-chip-contact | W1 | Control wine (0 days) (without chip-contact) | Godello |
W2 | Control wine (7 days) (without chip-contact) | ||
W3 | French oak (7 days) (Type 1) | ||
W4 | French oak (7 days) (Type 2) | ||
W5 | American oak (7 days) (Type 1) | ||
W6 | Control wine (15 days) (without chip-contact) | ||
W7 | French oak (15 days) (Type 1) | ||
W8 | French oak (15 days) (Type 2) | ||
W9 | American oak (15 days) (Type 1) | ||
W10 | Control wine (30 days) (without chip-contact) | ||
W11 | French oak (30 days) (Type 1) | ||
W12 | French oak (30 days) (Type 2) | ||
W13 | American oak (30 days) (Type 1) | ||
W14 | Control wine (60 days) (without chip-contact) | ||
W15 | French oak (60 days) (Type 1) | ||
W16 | French oak (60 days) (Type 2) | ||
W17 | American oak (60 days) (Type 1) | ||
Commercial wines | W18–W23 | N.S. | Godello |
W24–W40 | N.S. | Albariño | |
W41 | N.S. | Godello and Treixadura |
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Pérez-Gil, M.; Pérez-Lamela, C.; Falqué-López, E. Comparison of Chromatic and Spectrophotometric Properties of White and Red Wines Produced in Galicia (Northwest Spain) by Applying PCA. Molecules 2022, 27, 7000. https://doi.org/10.3390/molecules27207000
Pérez-Gil M, Pérez-Lamela C, Falqué-López E. Comparison of Chromatic and Spectrophotometric Properties of White and Red Wines Produced in Galicia (Northwest Spain) by Applying PCA. Molecules. 2022; 27(20):7000. https://doi.org/10.3390/molecules27207000
Chicago/Turabian StylePérez-Gil, Marina, Concepción Pérez-Lamela, and Elena Falqué-López. 2022. "Comparison of Chromatic and Spectrophotometric Properties of White and Red Wines Produced in Galicia (Northwest Spain) by Applying PCA" Molecules 27, no. 20: 7000. https://doi.org/10.3390/molecules27207000