# Archaeon Haloferax mediterranei produced PHBV from lemon by-products, up to 3.250 g/L in lab culture

- Published: 2026-11-14 05:27 UTC
- Section: Machines & Making › Materials science
- Tags: PHBV production, lemon waste, Haloferax mediterranei, halophilic archaeon, biopolymer, nucleating agents, orotic acid, hydroxyvalerate, Enmat Y1000, plastic pollution
- URL: https://realtech.media/news/rt-8e71a704d949ee1ca2414c51_archaeon_haloferax_mediterranei/

**Lemon industry by-products served as the carbon source for a halophilic archaeon; the polymer has 27.4% hydroxyvalerate and lower crystallinity than commercial PHBV.**

![Archaeon Haloferax mediterranei produced PHBV from lemon by-products, up to 3.250 g/L in lab culture](https://realtech.media/media/2026/11/fbd94d9dcec15afc.jpg)
*Rebecca Siegel, Wikimedia Commons, CC BY 2.0*

A study in Polymers describes the production of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) by the halophilic archaeon Haloferax mediterranei grown on lemon industry by-products as the carbon source [1]. The resulting polymer, HFX PHBV, was compared with the commercial grade Enmat Y1000 under identical conditions. Nucleating agents were added to it: orotic acid, boron nitride and theobromine [1].

## Fermentation and yield

The authors varied the by-product concentration, inoculum size and C:N:P ratios, then scaled the process up in a 2 L bioreactor [1]. In minimal medium, 11% (v/v) lemon by-product with a 5% (v/v) inoculum gave the highest productivity, 2.127 g/L PHBV [1]. Enriched media raised polymer accumulation to as much as 3.250 g/L [1].

## Properties of the polymer

The two polymers were characterised by NMR, TGA, MFR, DSC, Raman spectroscopy, XRD and DMA [1]. Compared with Enmat Y1000, HFX PHBV showed lower crystallinity, greater flexibility and a hydroxyvalerate content of 27.4%, which the authors link to improved ductility [1]. Among the nucleating agents, orotic acid was the most effective at enhancing crystallisation kinetics [1].

The authors conclude that the process yields a biopolymer with physicochemical properties competitive with a commercial standard. They present it as an approach to the problems of plastic pollution and food waste [1].

## Sources

1. [Polymers](https://doi.org/10.3390/polym18030340)
2. [science.mail.ru](https://science.mail.ru/news/60496-iz-othodov-pererabotki-limonov-nauchilis-delat-bioplastik)

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Source: RealTech, realtech.media — https://realtech.media/news/rt-8e71a704d949ee1ca2414c51_archaeon_haloferax_mediterranei/