With fresh wolfberry as the raw material, fresh wolfberry juice is manufactured through pre-disinfections, enzyme treatment, juice extracting, color protection and disinfections. The problems to keep wolfberry juice fresh at ambient temperature have been solved, and the production of wolfberry juice has entered industrial scale. The product is in form of orange-yellow juice. It is contained in aluminum-foil-plastic bag (25 kg/bag) in a carton box. The period of quality guarantee is 12 months.
The color of carotenoid, lutein and physalin in wolfberry is susceptible to change in the processing due to oxidation and high temperature. After the treatment with natural color protector, the original color of wolfberry juice is kept unchanged. In the analyses, no residue of Rogor, DDV, malathion and parathion was not traced. In wolfberry juice, Pb, As, Hg or Cd was not traced. The content of copper was found to be 1.2 mg /kg. The wolfberry juice is qualified on the basis of national standard.
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