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. 2016 Sep 20;9:480–491. doi: 10.1016/j.dib.2016.09.018

Data on changes in the fatty acid composition during fruit development and ripening of three mango cultivars (Alphonso, Pairi and Kent) varying in lactone content

Ashish B Deshpande a, Hemangi G Chidley a, Pranjali S Oak a, Keshav H Pujari b, Ashok P Giri a, Vidya S Gupta a,
PMCID: PMC5050263  PMID: 27722190

Abstract

Data in this article presents fatty acid composition of three mango cultivars; Alphonso, Pairi and Kent through fruit development and ripening. Change in the ω-6 and ω-3 fatty acids level during mango fruit development and ripening is depicted. Also, data on aroma volatile ‘lactones’ composition from pulp and skin tissues of these cultivars at their ripe stage, respectively is provided. Statistical data is also shown, which correlates modulation in lactone content with that of fatty acid composition and content during fruit development and ripening in all the three mango cultivars.

Keywords: α-linolenic acid, Fatty acids, Flavor, Lactones, Mango cultivars


Specifications Table

Subject area Biology, Chemistry
More specific subject area Fatty acid and lactone composition of mango fruit
Type of data Table, graph, figure
How data was acquired GC–MS: 7890B GC system Agilent Technologies coupled with Agilent 5977A MSD (Agilent technologies®, CA, U.S.A.)
Data format Analyzed
Experimental factors Pulp and skin tissues from fruits of three cultivars collected at various fruit development and ripening stages, tissue was snap frozen and stored at −80 °C.
Experimental features Fatty acid methyl esters (FAMEs) were synthesized by transesterification and aroma volatiles were extracted in dichloromethane, identified and quantified by GC–MS
Data source location Plant Molecular Biology Unit, Division of Biochemical Sciences, CSIR-National Chemical Laboratory, Pune 411008, (M. S.) India.
Data accessibility Data is provided within this article

Value of the data

  • Data from this research highlights the increase in the unsaturated fatty acid content in pulp and skin of mango with ripening and making ripened fruits more nutritious.

  • Data signifies nutritionally important ω-3 fatty acid (α-linolenic acid) rich nature of mango skin for utilization by various industries.

  • Investigated data from this article reveals probable fatty acid precursors for biosynthesis of lactones, which is useful to the researchers working in the area of flavor biochemistry.

1. Data

A total of 17 different fatty acids were identified and quantified from the pulp and the skin (Table 1, Table 2 and Fig. 1, Fig. 2) at various stages of mango fruit development and ripening from three cultivars viz. Alphonso, Pairi and Kent with high, low and no lactone content at ripe stage, respectively (Table 3). Present analysis revealed the ratio of ω6/ω3≤1 at ripe stage (Table 4) suggesting ripened mango fruits as perfect source of essential fatty acids [1].

Table 1.

Fatty acid composition of pulp.

Fatty acid composition (µg g−1 tissue) of pulp at various stages of fruit development and ripening from Alphonso, Pairi and Kent cultivars. Values shown are average of biological replicates sampled for the study. Difference between the stages was significant (p≤0.05) if the alphabets (a, b, c….) after the quantity of the compounds are different. Difference between the cultivars for each compound at each stage was significant (p≤0.05) if the alphabets (x, y, z) after the quantity of the compounds are different.

Compound 15 DAP 30 DAP 60 DAP Mature raw Table green Mid ripe Ripe Over ripe
Saturated fatty acids
Myristic acida (C14:0) Alphonso 8.41a,y 5.95a,xy 6.12a 28.81a,y 20.68a,x 83.09b,z 174.29c,y 184.41c,y
Pairi 7.2a,xy 7.73a,y 6.23a 24.66b,xy 77.54d,y 60.29c,y 74.03cd,x 77.56d,x
Kent 4.24a,x 3.8a,x 6a 5.42a,x 16.41b,x 26.65c,x 40.57d,x 52.44e,x
Palmitic acida (C16:0) Alphonso 1186.80a,y 1302.72a,y 1073.10a,y 1097.93a,z 922.36a,y 1274.21a,y 1933.43b,y 2705.91c,y
Pairi 1534.97b,z 1347.69b,y 962.06a,y 843.77a,y 1117.85ab,y 791.2a,x 896a,x 946.51a,x
Kent 830.61e,x 456.04b,x 290.26a,x 517.62bc,x 597.42c,x 574.87c,x 560.88c,x 678d,x
Stearic acida (C18:0) Alphonso 67.97b,y 62.12b,y 54.25ab,y 41.49ab,z 36.07a 50.28ab,y 75.63b,y 115.93c,y
Pairi 84.9b,z 81.52b,y 49.14a,y 26.92a,y 39.04a 30.13a,xy 33.36a,x 36.74a,x
Kent 57.29d,x 21.92ab,x 19.29a,x 20.18ab,x 40.05c 23.05ab,x 29.76b,x 25.27ab,x
Arachidic acida (C20:0) Alphonso 32.61c,y 33.66c,y 23.93bc,y 10.75a 9.97a 10.65a,y 19.01b,z 27.07c,y
Pairi 43.61c,z 47.16c,y 24.24b,y 11.42ab 8.53a 7.52a,xy 7.2a,y 6.25a,x
Kent 19.89c,x 7.91b,x 4.78ab,x 8.4b 7.38b 5.78ab,x 3.2a,x 6.47b,x
Behenic acida (C22:0) Alphonso 52.78c,y 49.96c,y 33.10b 8.06a 8.22a 14.33ab,y 24.90b,y 33.21b,y
Pairi 62.12c,y 61.13c,y 24.70b 9.30a 7.36a 8.34a,xy 8.88a,x 8.33a,x
Kent 37.82c,x 13.97b,x 6.50ab 8.66ab 8.02ab 5.74ab,x 3.67a,x 9.02b,x
Lignoceric acid (C24:0) Alphonso 53.35c 50.46c,xy 33.89b,y 18.00a 20.06a 27.97ab 35.85bc.y 41.46bc
Pairi 52.36b 67.32b,y 33.18ab,xy 18.30a 23.23a 23.60a 27.04a,x 28.39a
Kent 48.53ab 16.89a,x 9.90a,x 17.25a 24.87a 23.86a 24.88a.x 69.49b



Mono-unsaturated fatty acids
Palmitoleic acida (C16:1, n-7) Alphonso 11.79a,x 9.15a,x 11.79a,x 463.26a,y 293.57a,x 1325.77b,y 2881.90c,y 4325.90d,y
Pairi 15.07a,y 15.77a,xy 21.6a,xy 188.54a,x 715.89b,y 530.07b,x 599.84b,x 586.91b,x
Kent 13.52a,xy 18.11a,y 29.38a,y 77.29b,x 147.53c,x 201.97d,x 314.28e,x 452.73f,x
11-Hexadecenoic acidb (C16:1, n-5) Alphonso n.d. n.d. n.d. 20.84b 12.83ab,x 74.79c,y 146.22d,z 174.44e,y
Pairi n.d.a n.d.a n.d.a 14.71b 59.37c,y 45.13c,xy 51.49c,y 45.41c,x
Kent n.d.a n.d.a n.d.a 2.15b 8.95c,x 14.87d,x 22.42e,x 31.81f,x
10-Heptadecenoic acida, b (C17:1, n-7) Alphonso n.d.a n.d.a n.d.a 6.93b,z 6.10b,y 7.84bc 11.82c,z 18.69d,y
Pairi n.d.a n.d.a n.d.a n.d.a,x n.d.a,x 5.15b 8.76c,y 7.94c,x
Kent n.d.a n.d.a n.d.a 2.08b,y 4.31c,y 4.31c 3.76c,x 5.64d,x
Oleic acida (C18:1, n-9) Alphonso 271.54ab,xy 222.82ab,xy 161.31a,x 412.00b,y 357.16ab,x 759.02c,y 856.59c,y 1117.90d,y
Pairi 328.43a,y 463.79ab,y 282.07a,y 364.83a,y 1119.48c,y 765.78b,y 761.79b,y 683.93b,xy
Kent 255.24bc,x 133.62ab,x 97.01a,x 198.28b,x 285.4c,x 304.1c,x 261.3bc,x 296.77c,x
11-Octadecenoic acida, b (C18:1, n-7) Alphonso 29.06a,x 32.88a 33.01a,x 364.47b,y 289.59b 590.53c,y 646.48c,y 767.85c,y
Pairi 112.82ab,z 103.02ab 85.8a,y 144.54ab,x 427.63c 268.46b,x 248.78b,x 199.9b,x
Kent 46.48a,y 45.21a 41.69a,xy 102.89b,x 210.1cd 177.94c,x 176.61c,x 254.79d,x
11-Eicosenoic acidb (C20:1, n-9) Alphonso 6.59b 9.04bc 4.92ab 1.65a,x 1.94a 3.44ab,y 6.57b,y 10.24c,y
Pairi 6.9bc 8.67c 5.09b 1.97a,xy 3.04ab 2.5a,xy 2.39a,x 2.06a,xy
Kent 5.87c 4.67c 2.48b 2.72b,y 3.06b n.d.a,x n.d.a,x n.d.a,x



Poly-unsaturated fatty acid
9,12 Hexadecadienoic acidb (C16:2, n-4) Alphonso n.d.a n.d.a n.d.a n.d.a n.d.a 15.38b,y 33.86c,y 52.02d
Pairi n.d.a n.d.a n.d.a n.d.a n.d.a 9.12b,xy 17.71b,x 26.7d
Kent n.d.a n.d.a n.d.a n.d.a n.d.a n.d.a,x 16.08b,x 22.91c
Linoleic acida (C18:2, n-6) Alphonso 1425.06cd,xy 1707.67d,y 1119.71c 415.66ab 471.57b,y 115.73a,x 83.58a,x 79.46a
Pairi 1699.08c,y 1575.41c,y 953.05b 400.89a 198.49a,x 138.39a,xy 139.44a,y 95.55a
Kent 1178.94e,x 546.53d,x 260.25b 388.18c 387.2c,y 158.96a,y 80.05a,x 95.98a
9,15 Octadecadienoic acidb (C18:2, n-3) Alphonso n.d.a n.d.a n.d.a n.d.a n.d.a 30.20b,y 61.58c,y 85.94d,y
Pairi n.d.a n.d.a n.d.a n.d.a n.d.a 12.95b,xy 20.24bc,x 24.3c,x
Kent n.d.a n.d.a n.d.a n.d.a n.d.a n.d.a,x 20.93b,x 28.09c,x
Hepta-2,4(E,E)-dienoic acidb (C7:2, n-3) Alphonso 79.55a,x 54.86a,x 52.45a,x 117.22a,x 80.16a,x 727.71c 698.01c 481.16b
Pairi 167.66a,y 196.83a,y 120.89a,y 120.23a,x 954.79b,z 1120.84b 662.32ab 841.11b
Kent 215.1a,z 233.39a,y 248.32a,z 247.62a,y 441.4b,y 604.7c 835.33e 707.57d
Linolenic acida (C18:3, n-3) Alphonso 454.06b,y 443.29b,y 270.27a 323.19a,z 327.86ab 803.64c,y 840.37c,y 881.25c,y
Pairi 394.56c,xy 301.43b,xy 202.99a 237.76ab.y 424.59c 410.51c,x 522.23d,x 532.25d,x
Kent 326.21b,x 142.55a,x 106.54a 158.43a,x 343.86b 402.79b,x 408.42b,x 653.13c,x

n.d.: not detected.

a

Compounds identified by matching mass spectrum from NIST2011 and Wiley 10th edition mass spectral libraries and retention time and mass spectrum of authentic standard; remaining compounds were identified by matching mass spectrum from NIST2011 and Wiley 10th edition mass spectral libraries. MS spectra for odd chain and unusual poly-unsaturated FAMEs has been provided as Fig. 4.

b

Unusual fatty acids.

Table 2.

Fatty acid composition of skin.

Fatty acid composition (µg g−1 tissue) of skin at various stages of fruit development and ripening from Alphonso, Pairi and Kent cultivars. Values shown are average of biological replicates sampled for the study. Difference between the stages was significant (p≤0.05) if the alphabets (a, b, c….) after the quantity of the compounds are different. Difference between the cultivars for each compound at each stage was significant (p≤0.05) if the alphabets (x, y, z) after the quantity of the compounds are different.

Compound 15 DAP 30 DAP 60 DAP Mature raw Table green Mid ripe Ripe Over ripe
Saturated fatty acids
Myristic acida (C14:0) Alphonso 17.47a,xy 14.84a,y 14.6a,xy 49.79a,y 42.67a,y 145.71b,y 231.21c,x 216.96c,x
Pairi 19.58a,y 19.56a.y 17.49a,y 23.95a,x 92.42ab,z 168.01b,y 295.16c,xy 387.91d,y
Kent 9.96a,x 8.99a,x 11.58a,x 12.58a,x 22.49b,x 51.14c,x 323.9d,y 538.8e,z
Palmitic acida (C16:0) Alphonso 1738.73a,x 2011.49a,y 2139.59ab,x 2226.01ab,x 2088.43a,x 1890.39a,y 2682.16b 3253.66c,y
Pairi 2653.33a,y 2768.19ab,z 3309.13b,y 3407.48b,y 2938.97ab,y 2958.08ab,z 3460.13b 3756.19b,y
Kent 1944.53c,x 1637.99b,x 1921.57c,x 2338.6d,x 1898c,x 1215.83a,x 2883.29f 2534.02e,x
Stearic acida (C18:0) Alphonso 120.07a,x 108.78a,x 122.28a,xy 104.3a,x 103.52a,x 92.13a,x 123.57a,x 189.51b,y
Pairi 172.83a,y 168.75a,y 153.24a,y 135.52a,y 156.64a,y 166.39a,y 238.57b,y 263.01b,z
Kent 130.25c,x 93.98ab,x 103.75b,x 150.81d,y 90.88ab,x 82.32a,x 116.39bc,x 116.26bc,x
Arachidic acida (C20:0) Alphonso 58.52b 53.18b,x 58.98b 54.67b,x 48.66b 31.08a,x 29.21a,x 48.28b,xy
Pairi 80.59b 86.02b,y 81.04b 64.21ab,xy 55.21a 56.9a,y 55.24a,y 60.27a,y
Kent 61.9c 50.78b,x 59.04bc 72.13d,y 58.39bc 28.13a,x 32.56a,x 26.99a,x
Behenic acida (C22:0) Alphonso 66.96bc,x 65.62b,y 66.31b,xy 45.24a,x 41.88a 40.38a,y 43.83a 83.07c,y
Pairi 90.76b,xy 86.38b,z 76.46b,y 56.30a,xy 53.27a 54.01a,z 55.38a 60.04ab,xy
Kent 94.21d,y 50.79bc,x 52.60bc,x 59.86c,y 49.52bc 29.01a,x 43.73b 46.97b,x
Lignoceric acid (C24:0) Alphonso 80.13a,x 76.08a 76.42a 59.20a,x 53.98a,x 72.76a,xy 86.16a 192.83b,y
Pairi 110.84b,y 101.31ab 82.83ab 60.52a,xy 85.25ab,y 110.56b,y 117.24b 149.49b,y
Kent 115.19c,y 68.11b 72.40b 79.44b,y 66.49b,x 50.17a,x 71.15b 62.16ab,x



Mono-unsaturated fatty acids
Palmitoleic acida (C16:1, n-7) Alphonso 32.95a,x 24.95a,x 34.95a,x 150.86a 152.43a,x 736.63b,y 1986.59c,y 2266.38c,z
Pairi 50.48a,y 46.57a,y 55.57a,y 75.68a 189.08b,y 296.74c,x 533.59d,x 697.64e,x
Kent 48.93a,y 60.04a,z 91.5ab,z 135.47b 155.83b,x 170.38b,x 1527.72c,y 1621.55d,y
11-Hexadecenoic acidb (C16:1, n-5) Alphonso n.d.a n.d.a n.d.a 7.66b,y 7.1b,x 45.8c,y 119.07d,y 120.18d,y
Pairi n.d.a n.d.a n.d.a 8.4b,y 19.06c,y 33.24d,xy 58.01e,x 78.76f,x
Kent n.d.a n.d.a n.d.a n.d.a,x 10.84b,x 14.11b,x 147.05c,y 160.5d,z
10-Heptadecenoic acida,b (C17:1, n-7) Alphonso n.d. n.d. n.d. n.d. n.d. n.d. n.d. n.d.
Pairi n.d. n.d. n.d. n.d. n.d. n.d. n.d. n.d.
Kent n.d. n.d. n.d. n.d. n.d. n.d. n.d. n.d.
Oleic acida (C18:1, n-9) Alphonso 299.97a,x 251.48a,x 278.99a,x 785.17ab,y 622.61a,x 1532.67b,y 2376.3c,y 2982.71c,y
Pairi 394.18a,y 451.32a,y 426.62a,z 719.85b,xy 1604.09c,y 1764.73c,y 2847.25d,y 2587.84d,y
Kent 343.36b,xy 241.6a,x 349.46b,y 500.19c,x 461.87c,x 310.41b,x 778.48e,x 700.8d,x
11-Octadecenoic acida,b (C18:1, n-7) Alphonso 43.86a,x 54.94a,x 71.09a,x 179.86ab,xy 181.97ab,x 298.65b,y 480.59c,y 589.91c,y
Pairi 341.82c,z 298.55bc,z 225.38a,z 213.48a,y 231.02a,y 253.48ab,y 321.16c,x 305.35bc,xy
Kent 103.73b,y 71.75a,y 94.98ab,y 133.16bc,x 142.92c,x 93.29ab,x 282.14e,x 243.65d,x
11-Eicosenoic acidb (C20:1, n-9) Alphonso 3.71a,x 4.79a,y 3.89a,y 5.16a,y 4.03a,y 6.98ab,y 10.01b,y 15.24c,y
Pairi 6.65b,y 5.92ab,z 4.33ab,y 3.26a,x 5.88ab,z 8.37bc,y 10.49b,y 8.92bc,y
Kent 4.78e,x 2d,x 1.66cd,x 2.23d,x 1.31c,x 0.49b,x n.d.a,x n.d.a,x



Poly-unsaturated fatty acid
9,12 Hexadecadienoic acidb (C16:2, n-4) Alphonso n.d. n.d. n.d. n.d. n.d. n.d. n.d. n.d.
Pairi n.d. n.d. n.d. n.d. n.d. n.d. n.d. n.d.
Kent n.d. n.d. n.d. n.d. n.d. n.d. n.d. n.d.
Linoleic acida (C18:2, n-6) Alphonso 2054.46c 2671.6d,y 2446.85cd,xy 1385.42b,x 1374.07b 476.06a,x 422.83a,x 535.69a,x
Pairi 3104.44c 2742.04bc,y 2808.19bc,y 2223.28b,y 1516.53a 1552.89a,z 1956.03ab,z 1941.42ab,z
Kent 2749.59e 1735.03cd,x 1860.57d,x 1953.45d,y 1583.19c 918.49a,y 1277.41b,y 856.52a,y
9,15 Octadecadienoic acidb (C18:2, n-3) Alphonso n.d. n.d. n.d. n.d. n.d. n.d. n.d. n.d.
Pairi n.d. n.d. n.d. n.d. n.d. n.d. n.d. n.d.
Kent n.d. n.d. n.d. n.d. n.d. n.d. n.d. n.d.
Hepta-2,4(E,E)-dienoic acidb (C7:2, n-3) Alphonso 29.95a,x 28.07a,x 31.6a,x 63.06a,x 60.94a,x 426d,x 265.93c,x 142.11b,x
Pairi 190.16a,z 170.78a,y 166.88a,y 166.65a,y 563.59b,z 901.98c,z 1152.72d,y 621.23b,z
Kent 158.38a,y 258.62b,z 261.23b,z 271.33b,z 346.22c,y 553.56d,y 352.98c,x 335.56c,y
Linolenic acida (C18:3, n-3) Alphonso 938.51ab 883.07a,z 931.97ab 1265.3b,y 1196.94ab,xy 1303.57b,y 1149.88ab,x 1299.23b,x
Pairi 866.49a 724.08a,y 805.88a 868.83a,x 1480.56b,y 1487.2b,y 1991.68c,y 2181.91c,y
Kent 918.68c 590.34a,x 869.18bc 778.13b,x 1048.87d,x 821.21bc,x 1201.18e,x 897.43bc,x

n.d.: not detected.

a

Compounds identified by matching mass spectrum from NIST2011 and Wiley 10th edition mass spectral libraries and retention time and mass spectrum of authentic standard; remaining compounds were identified by matching mass spectrum from NIST2011 and Wiley 10th edition mass spectral libraries.

b

Unusual fatty acids.

Fig. 1.

Fig. 1

Fatty acid column chart- Content (µg g−1) of individual fatty acid from pulp and skin through various developing and ripening stages of Alphonso, Pairi and Kent mango cultivars. Vertical bars at each data point represent standard error of measurement calculated for the biological replicates used in the study.

Fig. 2.

Fig. 2

Radar plot representing contribution (mg g−1) of total fatty acids. Total saturated fatty acids from pulp (a), total saturated fatty acids from skin (b), total unsaturated fatty acids from pulp (c) and total unsaturated fatty acids from skin (d) at various developing and ripening stages of Alphonso, Pairi and Kent mango cultivars.

Table 3.

Lactone content of ripe fruit.

Lactone content (µg g−1 tissue) of pulp and skin of Alphonso, Pairi and Kent at ripe stage.

Lactone Alphonso Alphonso Pairi Pairi Kent Kent
pulp skin pulp skin pulp skin
γ-Butyrolactone 1.39±0.16 0.17±0.01 0.30±0.03 0.09±0.01 Tracea Tracea
γ-Hexalactone 1.45±0.16 0.28±0.01 0.12±0.04 n.d. n.d. n.d.
δ-Hexalactone 1.07±0.17 0.13±0.02 0.71±0.05 0.26±0.01 n.d. n.d.
γ-Octalactone 2.16±0.20 1.49±0.09 0.07±0.01 0.28±0.03 n.d. n.d.
δ-Octalactone 0.65±0.05 0.15±0.002 0.11±0.03 0.14±0.01 n.d. n.d.
γ-Decalactone 0.32±0.28 0.33±0.04 n.d. 0.35±0.06 n.d. n.d.
δ-Decalactone 0.09±0.01 0.61±0.20 n.d. n.d. n.d. n.d.
Total 7.12 3.16 1.3 1.12 n.d. n.d.
a

Compound detected in traces in GC–MS analysis but not detected in GC–FID analysis.

Table 4.

Flavor and nutritional perspective of fatty acids.

Table representing total lactone content (µg g−1), palmitic acid/palmitoleic acid (16:0/C16:1) ratio and linoleic acid/linolenic acid (ω6/ω3) in pulp and skin at ripe stage of Alphonso, Pairi and Kent mango cultivars. Values shown are average of biological replicates sampled for the study. Difference between the tissues was significant (p≤0.05) if the alphabets (a, b, c….) after the quantity of the lactone are different.

Flavor
Nutrition
Ripe tissue Total lactone C16:0/C16:1 LA/ALA (ω6/ω3)
content
Alphonso pulp 7.12d 0.67 0.1
Pairi pulp 1.30b 1.49 0.27
Kent pulp nda 1.78 0.2
Alphonso skin 3.16c 1.35 0.37
Pairi skin 1.12b 6.48 0.98
Kent skin nda 1.89 1.06

In the present data, a decrease in C16:0/C16:1 ratio and increase in the fatty acid derived flavor compounds, lactones, were evinced [2], [3] from Alphonso pulp and skin and Pairi pulp (Table 4). Similarly, palmitoleic acid, 11-octadecenoic acid and 9, 15- octadecadienoic acid showed strong correlations with total lactone content from ripe pulp and skin of three cultivars (Table 5), whereas various unsaturated fatty acids showed strong correlation with content of all the eight lactones individually (Table 6).

Table 5.

Correlation analysis.

Correlation analysis of total lactone content (µg g−1 tissue) and individual fatty acid content from the pulp and the skin tissues of Alphonso, Pairi and Kent cultivars at ripe stage. Values represent correlation coefficient (r), Values in bold represents strong positive correlation (0.7≤r) between fatty acid and lactone.

Fatty acid Correlation coefficient
Myristic acid −0.008
Palmitic acid 0.064
Stearic acid −0.064
Arachidic acid −0.043
Behenic acid 0.027
Lignoceric acid −0.144
Palmitoleic acid 0.847
11-Hexadecenoic acid 0.547
10-Heptadecenoic acid 0.633
Oleic acid 0.078
11-Octadecenoic acid 0.954
11-Eicosenoic acid 0.477
9,12-Hexadecadienoic acid 0.645
Linoleic acid −0.385
9,15-Octadecadienoic acid 0.76
2,4-Heptadienoic acid −0.099
Linolenic acid −0.053

Table 6.

Correlation analysis.

Correlation analysis of individual lactone and individual fatty acid content from the pulp and the skin tissues of Alphonso, Pairi and Kent cultivars at ripe stage. Values represent correlation coefficient (r), Values in bold represents strong positive correlation (0.7≤r) between fatty acid and lactone content.

Lactone Palmitoleic acid 10-Heptadecenoic acid 11-Octadecenoic acid 11-Eicosenoic acid 9,12-Hexadecadienoic acid 9,15-Octadecadienoic acid
γ-Butyrolactone 0.752 0.813 0.828 0.229 0.823 0.91
γ-Hexalactone 0.832 0.73 0.885 0.259 0.77 0.878
δ-Hexalactone 0.487 0.9 0.622 0.202 0.808 0.825
γ-Octalactone 0.888 0.416 0.974 0.566 0.457 0.592
δ-Octalactone 0.77 0.706 0.893 0.405 0.724 0.836
γ-Decalactone 0.496 −0.058 0.748 0.953 −0.035 0.118
δ-Decalactone 0.452 −0.283 0.472 0.558 −0.287 −0.22

2. Experimental design, materials and methods

2.1. Plant material

Fruits of cv. Alphonso and cv. Pairi were collected from the Mango Research Sub Centre, Deogad (16° 31′ N, 73° 20′ E) and of cv. Kent from the Regional Fruit Research Station, Vengurle (15° 51′ N, 73° 39′ E), both affiliated to Dr. Balasaheb Sawant Konkan Agricultural University, Dapoli, Maharashtra, India. Developing stages of all the three mango cultivars were collected at 15, 30 and 60 days after pollination (DAP) and at mature raw stage (90 DAP for cvs. Alphonso and Pairi, 110 DAP for cv. Kent). Fruits at these developing stages were harvested, pulp (mesocarp) and skin (exocarp) separated immediately, snap frozen in liquid nitrogen and stored at −80 °C until further use. A set of 12 fruits each for all the three cultivars were additionally harvested at their respective mature raw stage and kept in the hay containing boxes at ambient temperature for ripening. Three cultivars showed variation in the ripening duration, hence four ripening stages as table green, mid ripe, ripe and over ripe based on the skin color, aroma and fruit softness (each stage is represented by days after harvest i.e. DAH for cv. Alphonso as 5, 10, 15 and 20 days; for cv. Pairi as 4, 6, 8 and 10 days and for cv. Kent as 5, 8, 10 and 13 days, respectively) were used for further analysis. At each ripening stage fruits for each cultivar were removed from the box, pulp and skin were separated, frozen in liquid nitrogen and stored at −80 °C till further use.

2.2. Transesterification of fatty acids

Fatty acid methyl esters (FAMEs) were synthesized by transesterification reaction in methanolic HCl. 500 mg of the tissue was finely crushed in liquid nitrogen and added to the 5 ml methanol containing 3 M HCl, 25 µg butylated hydroxyltoluene (BHT) as an antioxidant and 250 µg tridecanoic acid as an internal standard. Transesterification was carried out at 80 °C in water bath for 2 h to synthesize FAMEs. After incubation reaction mixture was cooled on ice and FAMEs were extracted twice in 2 ml n-Hexane. n-Hexane layer was completely evaporated in vacuum evaporator, FAMEs were reconstituted in 250 µl chloroform and used for Gas Chromatography-Mass Spectrometry (GC–MS) and GC–Flame Ionization Detector (FID) analysis.

2.3. Extraction of aroma volatiles

Aroma volatiles were extracted from 2 g pulp and skin of completely ripe fruits of all the 3 cultivars by solvent extraction method using dichloromethane with appropriate concentration of nonyl acetate as an internal standard. Procedures for dehydration of dichloromethane, removal of fats and concentrating extracts were carried out as described earlier [4], [5].

2.4. Gas chromatography analysis

2.4.1. Identification and quantification of FAMEs

Gas chromatographic analysis was carried out on 7890B GC system Agilent Technologies coupled with Agilent 5977 A MSD (Agilent technologies®, CA, U.S.A.). 1 µl chloroform reconstituted FAMEs were injected for GC–MSD analysis. Method for the gas chromatographic separation of fatty acid structural isoforms was standardized, for better resolution of fatty acids 75 m long SP 2560 (Supelco, Bellefonte, Pennsylvania, U.S.A.) column with 0.18 mm i.d. and 0.14 µm film thickness was used (Fig. 3). Helium was used as the carrier gas with 1 ml min−1 flow. Initial oven temperature was kept at 130 °C and held for 5 min, followed by a ramp of 10 °C min−1 till 230 °C with hold at 230 °C for 20 min. Injector temperature was maintained at 250 °C, source, quadrupole and transfer line temperatures were 150 °C, 180 °C and 250 °C, respectively. Mass spectra were obtained by Agilent MSD at 70 eV on scan mode with scanning time of 0.2 s for range of m/z 30–400. FAMEs were identified by matching generated spectra with NIST 2011 and Wiley 10th edition mass spectral libraries (Fig. 4). Identified compounds were confirmed by matching retention time and spectra of authentic standards procured from Sigma Aldrich (St. Louis, MO, USA). Identified compounds were quantified by GC–FID. Similar chromatographic conditions were maintained for GC–FID with detector temperature at 250 °C. Absolute quantification was done using internal standard by normalizing concentrations of all the FAMEs with that of tridecanoic acid methyl ester.

Fig. 3.

Fig. 3

Representative GC chromatogram of fatty acids from pulp (A) and skin (B). Peak labels represents, compounds as IS: Internal standard, 1: Myristic acid, 2: Palmitic acid, 3: Palmitoleic acid, 4: 11-Hexadecenoic acid, 5: Hepta-2,4(E,E)-dienoic acid, 6: 10-Heptadecenoic acid, 7: 9,12-Hexadecadienoic acid, 8: Stearic acid, 9: Oleic acid, 10: 11-Octadecenoic acid, 11: Linoleic acid, 12: 9,15 Octadecanoic acid, 13: Arachidic acid, 14: 11-Eicosenoic acid, 15: α-Linolenic acid, 16: Behenic acid, 17: Lignoceric acid.

Fig. 4.

Fig. 4

MS spectra of odd chain and unusual poly-unsaturated fatty acid methyl esters. Head to tail alignment of spectra for 10-Heptadecenoic acid (A), Hepta-2,4(E,E)-dienoic acid (B), 9,12 Hexadecadienoic acid (C) and 9,15 Octadecadienoic acid (D). Upward spectra in red color represent experimental spectra while downward spectra in blue color represent standard spectra from NIST 2011 library.

2.4.2. Qualitative and quantitative analysis of lactones

GC-MSD and GC-FID analysis for lactones was carried out on similar instrument used for analysis of FAMEs. Aroma volatiles were separated on GsBP-5MS® (GeneralSeparation Technologies, Newark, DE, U.S.A.) capillary column (30 m×0.32 mm i.d. ×0.25 µm film thickness). Other chromatographic conditions were maintained as mentioned previously [6]. Since fatty acids are known to be the precursors for lactone biosynthesis, qualitative and quantitative analysis for lactones alone was carried out in the present study. Lactones were identified by matching generated spectra with NIST 2011 and Wiley 10th edition mass spectral libraries. Identified compounds were confirmed by matching retention time and spectra of authentic standards procured from Sigma Aldrich (St. Louis, MO, U.S.A.). Absolute quantification was done using internal standard by normalizing concentrations of all the lactones with that of known concentration of nonyl acetate.

2.5. Statistical analysis

To validate data statistically tissue for each developing and ripening stages were collected from fruits of 3 independent trees for cv. Alphonso and 2 independent trees each for cv. Pairi and cv. Kent. These were considered as biological replicates. Extraction of FAMEs and volatiles was carried out twice for each tissue as technical replicates followed by duplicate GC–FID runs of each extracts as analytical replicates. Fisher׳s LSD test was performed separately for pulp and skin at p≤0.05 by ANOVA for comparative analysis of quantity of each fatty acid during various developing and ripening stages from each cultivar. Also comparison was done for each fatty acid at individual stage among the three cultivars using StatView® software, version 5.0 (SAS Institute Inc., Cary, NC, U.S.A.). Similarly ANOVA was carried out for lactone content of ripe pulp and skin from the three cultivars. Correlation analysis of total lactone content with individual fatty acid content and individual lactone content with individual fatty acid content from the pulp and the skin of three cultivars at ripe stage was studied using StatView software. Principle component analysis for whole data set (Fig. 5) of fatty acid content was carried out using Systat® statistical software (Version11, Richmond, CA, U.S.A.).

Fig. 5.

Fig. 5

Loading plot (a) and Score plot (b) of principle component analysis of 17 different fatty acids contributing to pulp and skin through various stages of fruit development and ripening from three mango cultivars, Alphonso, Pairi and Kent. Average values from biological replicates for each fatty acid were considered for the analysis. For the score plot (b) data labels represents, cultivars as A: Alphonso, P: Pairi and K: Kent, tissues as p: pulp and s: skin and stages as15: 15DAP, 30: 30DAP, 60: 60DAP, MR: mature raw, TG: table green, MDR: mid ripe, R: ripe and OR: over ripe.

Acknowledgments

A.B.D, H.G.C. and P.S.O. thank CSIR, India and UGC, India for research fellowships. Dr. Balasaheb Sawant Konkan Agriculture University staff is acknowledged for their field support at Deogad and Vengurle research stations. This research was funded by the Council of Scientific and Industrial Research, New Delhi, India under project CSC0133 (FUN HEALTH) to CSIR-NCL and 21(0997)/16/EMR-II grant as Emeritus Scientistship Scheme to Dr. Vidya Gupta. All the authors declare that they have no conflict of interest.

Footnotes

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