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Effect of different selected food processing techniques on control release kinetics of encapsulated lycopene in simulated human gastrointestinal tract

Nanoencapsulation has become a widespread technique to improve the bioavailability of bioactive compounds like lycopene. Consumption of lycopene rich foods is effective in preventing cancer, diabetes, and cardiovascular diseases due to its strong, oxygen-quenching ability. But the functional activity of lycopene is compromised by light, oxygen, and heat. A biodegradable polymer such as PLA or PLGA is the most effective carrier for encapsulating lycopene due to its excellent biodegradability, biocompatibility, and nontoxigenic effect on the human metabolic system. Hence, the primary objective of this study was to evaluate the effect of pasteurization on bioaccessibility and control release kinetics of encapsulated lycopene nanoparticles in invitro human GIT. In the first objective, sonication time, surfactant, and polymer concentration were considered as the three factors to synthesize polymeric lycopene nanoparticles (LNP) whereas in the second objective, type of pasteurization, encapsulation, and juice concentration were three factors. In Objectives 4 and 5, the type of encapsulation and pasteurization, and digestion time were evaluated as the three factors used to evaluate the in-vitro bioaccessibility of encapsulated lycopene NP. The study evidenced that encapsulation improved the lycopene's bioaccessibility by 70% and more than 60% for conventional pasteurized (CP) and microwave pasteurized (MP) nanoemulsions, respectively without compromising the physicochemical properties of both PLA and PLGA-lycopene nanoparticles. The invitro bioaccessibility study also showed that CP reduced the functional activity of PLALNP by 20% whereas MP had no significant effect on the bioaccessibility of PLA LNP. It is unlikely that the PLGA LNP was more sensitive against MP nanoemulsion than the CP. In conclusion, it was shown that the PLA LNP treated with MP provided the highest bioaccessibility.

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