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Production of lactose-free milk can provide a solution to this problem, although it requires use of lactase from microbial sources and increases potential for contamination. Use of thermostable lactase enzymes can overcome this issue by functioning under pasteurization conditions.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Results<\/jats:title>\n            <jats:p>A thermostable \u03b2-glucosidase gene from <jats:italic>Pyrococcus furiosus<\/jats:italic> was cloned in frame with the <jats:italic>Saccharomyces cerecisiae<\/jats:italic> a-factor secretory signal and expressed in <jats:italic>Pichia pastoris<\/jats:italic> strain X-33. The recombinant enzyme was purified by a one-step method of weak anion exchange chromatography. The optimum temperature and pH for this \u03b2-glucosidase activity was 100\u00b0C and pH\u00a06.0, respectively. The enzyme activity was not significantly inhibited by Ca<jats:sup>2+<\/jats:sup>. We tested the additive amount, hydrolysis time, and the influence of glucose on the enzyme during pasteurization and found that the enzyme possessed a high level of lactose hydrolysis in milk that was not obviously influenced by glucose.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Conclusions<\/jats:title>\n            <jats:p>The thermostablity of this recombinant \u03b2-glucosidase, combined with its neutral pH activity and favorable temperature activity optima, suggest that this enzyme is an ideal candidate for the hydrolysis of lactose in milk, and it would be suitable for application in low-lactose milk production during pasteurization.<\/jats:p>\n          <\/jats:sec>","DOI":"10.1186\/1472-6750-13-73","type":"journal-article","created":{"date-parts":[[2013,9,21]],"date-time":"2013-09-21T19:02:36Z","timestamp":1379790156000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":35,"title":["Preparation of lactose-free pasteurized milk with a recombinant thermostable \u03b2-glucosidase from Pyrococcus furiosus"],"prefix":"10.1186","volume":"13","author":[{"given":"Bin","family":"Li","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zemin","family":"Wang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shiwu","family":"Li","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"William","family":"Donelan","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xingli","family":"Wang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Taixing","family":"Cui","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dongqi","family":"Tang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2013,9,21]]},"reference":[{"issue":"9","key":"984_CR1","doi-asserted-by":"crossref","first-page":"2705","DOI":"10.1002\/j.1460-2075.1988.tb03124.x","volume":"7","author":"N Mantei","year":"1988","unstructured":"Mantei N, Villa M, Enzler T, Wacker H, Boll W, James P, Hunziker W, Semenza G: Complete primary structure of human and rabbit lactase-phlorizin hydrolase: implications for biosynthesis, membrane anchoring and evolution of the enzyme. 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