Journal of Food Measurement and Characterization

, Volume 13, Issue 3, pp 1991–1999 | Cite as

Detection of cracked shell in intact aromatic young coconut using near infrared spectroscopy and acoustic response methods

  • Sirinad NoypitakEmail author
  • Wachiraya Imsabai
  • Worawat Noknoi
  • Supasuta Karoojee
  • Anupun Terdwongworakul
  • Hikaru Kobori
Original Paper


The objective of this study was to investigate the application of near infrared spectroscopy (NIRS) and acoustic response to detect cracking in aromatic young Thai coconuts. A sample of 202 aromatic young coconut fruits (106 normal and 96 cracked fruits) was harvested from Samutsakorn and Ratchaburi provinces in Thailand. The samples were scanned in reflectance mode using Fourier-transformed NIRS in the range 11,100–3996 cm−1 (900–2500 nm) and also measured for an acoustic response. Classification models were developed using partial least squares discrimination analysis. The accuracy of discrimination between normal coconuts and cracked coconuts with the acoustic response model was 85.07%. The best accuracy of discrimination was 94.03% based on absorbance spectra. NIRS offered a non-destructive means to detect the cracked shell of coconut fruit still attached to the bunch.


Cracking Young coconut Near infrared reflectance Acoustic response 



The authors gratefully acknowledge the Thailand Research Fund (Grant number: RDG5820033) and the Faculty of Engineering at Kamphaengsaen, Kasetsart University, Thailand for financially supporting this research. The Postharvest Technology Center, Kasetsart University provided near infrared spectrometry support.

Compliance with ethical standards

Conflict of interest

The authors declare no conflict of interest.


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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • Sirinad Noypitak
    • 1
    Email author
  • Wachiraya Imsabai
    • 2
  • Worawat Noknoi
    • 1
  • Supasuta Karoojee
    • 2
  • Anupun Terdwongworakul
    • 1
  • Hikaru Kobori
    • 3
  1. 1.Department of Agricultural Engineering, Faculty of Engineering at KamphaengsaenKasetsart UniversityKamphaengsaenThailand
  2. 2.Department of Horticulture, Faculty of Agriculture at KamphaengsaenKasetsart UniversityKamphaengsaenThailand
  3. 3.Department of Bioresource Sciences, Faculty of AgricultureShizuoka UniversityShizuokaJapan

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