Sugar, total phenolic content and antioxidant activity of integral carob (Ceratonia siliqua L.) powder during the simulated gastrointestinal tract digestion as related to the particle-size effect

Research output: Contribution to conferenceAbstractpeer-review

Abstract

Carob (Ceratonia siliqua L.) fruit is obtained from the evergreen carob tree, native to the Mediterranean region 1,2 and produced mainly in Portugal, Italy, Morocco and Turkey 3– 5. Portugal has a high-cultivated extent with relevant carob fruit production at low prices. Carob products containing phenolic substances exhibit antioxidant capacity and can promote human health, and aid in preventing chronic diseases 6,7. Currently, carob powder (CP) production is mainly achieved after the pulp separation despite having been demonstrated that seeds improve the extraction efficiency of bioactive compounds like polyphenols 4. This study aimed to produce an integral CP through an innovative process and assess its physicochemical and bioactive properties in different particle sizes throughout a simulated gastrointestinal tract (GIT) digestion. The sugar content profile obtained throughout GIT digestion indicates that the highest present sugar in undigested carob powders is digested and broken into simple sugars like glucose and fructose, potentiating CPs as a functional and within healthy food intake recommendations ingredient to use. The total phenolic content and antioxidant activity obtained for the ≤100 μm fraction are correlated and gastric digestion promotes the increase in TPC value compared to chemically extracted samples (undigested). The >100 μm fractions display a distinct profile from ≤100 μm, possibly due to higher content in insoluble fibers, which hinders the release of these bioactive compounds from the carob matrix. This study showed that the particle-size affects the sugar, antioxidant and total phenol content under gastrointestinal tract digestion. The ≤100 μm fraction obtained the best suitable profile as a functional food ingredient.
Original languageEnglish
Pages1-3
Number of pages3
Publication statusAccepted/In press - 28 Feb 2022
EventBioIberoamérica 2022 - Altice Forum Braga, Braga, Portugal
Duration: 7 Apr 20229 Apr 2022
Conference number: 3
https://www.bioiberoamerica2022.com/pt/home

Conference

ConferenceBioIberoamérica 2022
Country/TerritoryPortugal
CityBraga
Period7/04/229/04/22
Internet address

Keywords

  • Carob powder
  • GIT digestion
  • Total phenolic content
  • Antioxidant activity

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