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<p>Five guava (<i>Psidium guajava</i> L.) genotypes, Punjab Pink, Hisar Surkha, Black guava, Shweta, and Pant Prabhat were studied for their pulp colour development at four stages: S1, when seed ball started developing colour; S2, when pulp started developing pink colour; S3, when uniform pink colour developed in pulp and seed ball; and S4, mature ripe. The two stages namely S2 and S3 in pink pulped guava genotypes had shown marked changes in pigment content and Hunter colour <i>L*, a*, b*</i> values. Hence, these stages are appropriate to study the expression of genes related to pulp colour. Out of three colour indices <i>i.e</i>., CI-1[1000 x <i>a</i>*/ (<i>L* x b</i>*)]; CI-2 [1000 x <i>a</i>*/ <i>L</i>*]; and CI-3 [1000 x <i>b*/L*</i>], the CI-2 had significantly higher correlation values for total anthocyanin (0.786) and lycopene (0.418) content. It also had higher correlation value for total carotenoid content (0.263) as compared to CI-1 and CI-3. The CI-2 values clearly distinguished between purple, pink and white pulped guava. Hence, it can be used for colour measurement and to decide the criteria for raw material (guava) selection for processing industry to develop safe products which are free from artificial colourants for consumers.</p>

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Colour Index Formulation in Guava (Psidium guajava L.): Capturing Nutrient Richness through Pigment-Derived Pulp Colour Variations

  • 期刊论文

  • 发表日期：

    2026年2月12日

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  • Poonam Maurya,
  • Madhubala Thakre,
  • Shubham Jagga,
  • Chukkamettu Anusha,
  • Nayan Deepak Gangappa,
  • Arumugam Nagaraja,
  • Mahendra Kumar Verma,
  • Eldho Varghese,
  • S. Gopala Krishnan,
  • Amitha Mithra Sevanthi

摘要

Five guava (Psidium guajava L.) genotypes, Punjab Pink, Hisar Surkha, Black guava, Shweta, and Pant Prabhat were studied for their pulp colour development at four stages: S1, when seed ball started developing colour; S2, when pulp started developing pink colour; S3, when uniform pink colour developed in pulp and seed ball; and S4, mature ripe. The two stages namely S2 and S3 in pink pulped guava genotypes had shown marked changes in pigment content and Hunter colour L*, a*, b* values. Hence, these stages are appropriate to study the expression of genes related to pulp colour. Out of three colour indices i.e., CI-1[1000 x a*/ (L* x b*)]; CI-2 [1000 x a*/ L*]; and CI-3 [1000 x b*/L*], the CI-2 had significantly higher correlation values for total anthocyanin (0.786) and lycopene (0.418) content. It also had higher correlation value for total carotenoid content (0.263) as compared to CI-1 and CI-3. The CI-2 values clearly distinguished between purple, pink and white pulped guava. Hence, it can be used for colour measurement and to decide the criteria for raw material (guava) selection for processing industry to develop safe products which are free from artificial colourants for consumers.