{"id":7378,"date":"2024-09-27T13:31:39","date_gmt":"2024-09-27T13:31:39","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=7378"},"modified":"2026-04-28T10:42:36","modified_gmt":"2026-04-28T10:42:36","slug":"application-of-enzyme-preparations-in-yeast-hydrolysates","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/fr\/application-of-enzyme-preparations-in-yeast-hydrolysates\/","title":{"rendered":"Application des pr\u00e9parations enzymatiques dans les hydrolysats de levure"},"content":{"rendered":"<h1>Application des pr\u00e9parations enzymatiques dans les hydrolysats de levure<\/h1>\n<p><!-- lc-qa-start --><\/p>\n<p><strong>Quick answer:<\/strong> A practical enzyme or food-ingredient decision starts with the process target, then checks activity, application window, sensory impact, and batch-to-batch consistency before scale-up.<\/p>\n<p><!-- lc-qa-end --><\/p>\n<p>Avec le d\u00e9veloppement continu de l'industrie de l'alimentation animale et l'am\u00e9lioration continue de la technologie de la levure, les hydrolysats de levure sont devenus l'une des alternatives aux mati\u00e8res premi\u00e8res prot\u00e9iques dans l'industrie de l'alimentation animale. En septembre 2018, face \u00e0 la nouvelle situation dans laquelle le minist\u00e8re de l'agriculture a explicitement ordonn\u00e9 la suspension de l'utilisation de produits sanguins porcins dans l'alimentation des porcs, les produits d'hydrolysats de levure sont devenus encore plus populaires et jouent un r\u00f4le encore plus important.<\/p>\n<p>L'hydrolysat de levure est un produit obtenu par autolyse ou par hydrolyse exog\u00e8ne catalys\u00e9e par une enzyme du myc\u00e9lium obtenu par fermentation liquide en utilisant Saccharomyces cerevisiae comme souche. La levure soluble n'est pas extraite et la teneur en prot\u00e9ines brutes n'est pas inf\u00e9rieure \u00e0 35%. Les principaux types de souches de production utilis\u00e9s aujourd'hui sont les suivants : la premi\u00e8re est une levure de bi\u00e8re filtr\u00e9e apr\u00e8s fermentation, dont la teneur en prot\u00e9ines est comprise entre 42 et 47%. La qualit\u00e9 du produit varie en fonction du processus de fermentation de la bi\u00e8re, le go\u00fbt est amer et a une saveur de bi\u00e8re, et le co\u00fbt est faible ; l'autre est la levure de bi\u00e8re ferment\u00e9e avec de la m\u00e9lasse, avec une teneur en prot\u00e9ines de 50-60%. La qualit\u00e9 du produit est stable, le go\u00fbt est frais et parfum\u00e9, et le co\u00fbt est \u00e9lev\u00e9.<\/p>\n<p>Les hydrolysats de levure sont produits principalement par l'activation d'enzymes endog\u00e8nes et exog\u00e8nes. Diff\u00e9rentes fermentations de levure peuvent conduire \u00e0 une activit\u00e9 \u00e9lev\u00e9e ou faible des enzymes endog\u00e8nes. L'ajout d'enzymes exog\u00e8nes permet d'am\u00e9liorer les indicateurs du produit sous tous ses aspects.<\/p>\n<p>Les indicateurs de qualit\u00e9 de l'hydrolysat de levure comprennent g\u00e9n\u00e9ralement les prot\u00e9ines brutes, les acides nucl\u00e9iques, l'azote \u00e0 base d'acides amin\u00e9s, les acides amin\u00e9s, les prot\u00e9ines solubles dans l'acide, les petits nucl\u00e9otides peptidiques, etc. Les prot\u00e9ines brutes et les acides nucl\u00e9iques sont d\u00e9termin\u00e9s par la souche de fermentation, et ces deux indicateurs sont diff\u00e9rents selon les esp\u00e8ces et les souches mutantes.<\/p>\n<p>Pendant l'autolyse, certaines entreprises ajoutent des hydrolases de la paroi cellulaire pour aider \u00e0 d\u00e9composer la paroi cellulaire de la levure, acc\u00e9l\u00e9rer la dissolution des substances intracellulaires et am\u00e9liorer le taux d'utilisation des ingr\u00e9dients actifs. Cela facilite \u00e9galement l'hydrolyse des prot\u00e9ines et des acides nucl\u00e9iques.<\/p>\n<p>L'ajout d'une prot\u00e9ase permet d'hydrolyser efficacement les prot\u00e9ines en prot\u00e9ines mol\u00e9culaires de petite taille, en polypeptides, en petits peptides et en acides amin\u00e9s. Gr\u00e2ce \u00e0 la coop\u00e9ration de diff\u00e9rents types d'endopeptidases, les sites de clivage des pr\u00e9parations enzymatiques peuvent \u00eatre augment\u00e9s efficacement, ce qui permet d'accro\u00eetre consid\u00e9rablement le degr\u00e9 d'hydrolyse des prot\u00e9ines et d'hydrolyser davantage de prot\u00e9ines macromol\u00e9culaires en substances plus petites. L'application de prot\u00e9ases compos\u00e9es peut consid\u00e9rablement augmenter l'azote des acides amin\u00e9s du produit, les acides amin\u00e9s, les prot\u00e9ines solubles dans l'acide et la teneur en petits peptides, ce qui donne au produit une nutrition plus riche qui peut \u00eatre plus facilement absorb\u00e9e par le b\u00e9tail.<\/p>\n<p>Lors de l'hydrolyse des prot\u00e9ines, de nombreux peptides et petits peptides hydrophobes sont produits. Lorsque le produit pr\u00e9sente un degr\u00e9 d'hydrophobie trop \u00e9lev\u00e9, il peut produire un go\u00fbt amer d\u00e9sagr\u00e9able. L'ajout d'enzymes aromatiques permet de couper efficacement les acides amin\u00e9s hydrophobes, de r\u00e9duire l'hydrophobicit\u00e9 du produit, de diminuer le go\u00fbt amer, d'am\u00e9liorer l'ar\u00f4me et de rendre le produit plus app\u00e9tissant.<\/p>\n<p>Les acides nucl\u00e9iques et les nucl\u00e9otides sont essentiels \u00e0 la croissance des jeunes animaux. L'ajout d'une hydrolase exog\u00e8ne d'acides nucl\u00e9iques peut d\u00e9grader les acides nucl\u00e9iques lib\u00e9r\u00e9s du noyau en nucl\u00e9otides, enrichir les nutriments de l'hydrolysat de levure, fournir suffisamment d'\u00e9nergie aux jeunes animaux et favoriser une croissance rapide des animaux.<\/p>\n<p>L'ajout de divers types d'enzymes exog\u00e8nes dans la production d'hydrolysat de levure am\u00e9liore l'op\u00e9rabilit\u00e9 de la production, enrichit la nutrition du produit, modifie le go\u00fbt du produit et fournit la base n\u00e9cessaire \u00e0 la production d'hydrolysat de levure de haute qualit\u00e9. On pense que dans un avenir proche, avec le d\u00e9veloppement continu de l'ing\u00e9nierie enzymatique et l'application croissante de pr\u00e9parations enzymatiques sp\u00e9ciales, la qualit\u00e9 de l'hydrolysat de levure repartira \u00e0 la hausse.<\/p>\n<h1>L'impact des pr\u00e9parations enzymatiques sur l'ar\u00f4me de l'extrait de levure<\/h1>\n<p>L'extrait de levure (EJ) est un condiment naturel de haute qualit\u00e9 fabriqu\u00e9 \u00e0 partir de levure alimentaire comme mati\u00e8re premi\u00e8re, qui est raffin\u00e9e par autolyse, s\u00e9paration et autres processus pour d\u00e9grader les prot\u00e9ines et les acides nucl\u00e9iques dans les cellules de levure. L'EJ peut elle-m\u00eame volatiliser une vari\u00e9t\u00e9 de compos\u00e9s odorants aux ar\u00f4mes de grill\u00e9 et de viande, tels que les pyrazines et les thioph\u00e8nes. En tant qu'agent aromatique, l'EJ est \u00e9galement riche en compos\u00e9s aromatiques non volatils tels que les acides amin\u00e9s, les nucl\u00e9otides et les peptides. Ces compos\u00e9s volatils et non volatils d\u00e9terminent ensemble l'ar\u00f4me d'un YE particulier.<\/p>\n<p>Le facteur qui influence le plus fortement la saveur de l'EJ est la levure. Les diff\u00e9rentes souches de levure d\u00e9terminent les diff\u00e9rences dans les prot\u00e9ines endog\u00e8nes de la levure, les acides nucl\u00e9iques, les vitamines, les compos\u00e9s m\u00e9taboliques, etc. et donc l'ar\u00f4me. Si l'on utilise une levure de m\u00eame origine pour produire de l'EJ, le facteur le plus influent est le processus de production. Les diff\u00e9rentes pr\u00e9parations enzymatiques impliqu\u00e9es dans le processus ont une influence d\u00e9cisive sur le go\u00fbt de l'EJ.<\/p>\n<p>La levure est tr\u00e8s riche en prot\u00e9ines, repr\u00e9sentant environ 40-65% du poids sec de la levure. L'effet aromatisant des prot\u00e9ines apr\u00e8s hydrolyse occupe une place importante dans l'extrait de levure. De nombreuses ann\u00e9es de recherche ont montr\u00e9 qu'apr\u00e8s l'hydrolyse des prot\u00e9ines par les prot\u00e9ases, divers polypeptides, petits peptides, acides amin\u00e9s et amides sont form\u00e9s, et que diff\u00e9rentes substances donnent \u00e0 l'extrait des saveurs diff\u00e9rentes. Par exemple, les recherches ont montr\u00e9 que les polypeptides d'un poids mol\u00e9culaire de 2000-5000Da conf\u00e8rent \u00e0 l'extrait de levure un ar\u00f4me de<b> saveur douce<\/b>L'extrait d'huile d'olive est un produit \u00e0 base de peptides, ce qui rend l'ar\u00f4me plus persistant et prolonge la dur\u00e9e de conservation de l'ar\u00f4me du produit final. Certains petits peptides mol\u00e9culaires avec des r\u00e9sidus de cyst\u00e9ine ou de m\u00e9thionine, d'un poids mol\u00e9culaire de 200-1000Da, conf\u00e8rent \u00e0 l'extrait une certaine stabilit\u00e9. <b>go\u00fbt de viande<\/b>Les acides amin\u00e9s tels que l'acide glutamique, l'acide aspartique, la ph\u00e9nylalanine, l'alanine, la glycine et la tyrosine conf\u00e8rent \u00e0 l'extrait un pouvoir de s\u00e9chage \u00e9lev\u00e9.<b> une forte saveur umami<\/b>La levure contient \u00e9galement de l'ARN en abondance qui, apr\u00e8s hydrolyse enzymatique, produit des sels de sodium d'IMP et de GMP, donnant l'extrait de levure.<b> une saveur umami extr\u00eame<\/b>. Toutes les substances qui conf\u00e8rent \u00e0 l'extrait son ar\u00f4me peuvent \u00eatre obtenues par hydrolyse enzymatique cibl\u00e9e de pr\u00e9parations enzymatiques.<\/p>\n<p>Avec le d\u00e9veloppement des technologies modernes de fermentation, les pr\u00e9parations enzymatiques sont devenues de plus en plus vari\u00e9es. Dans la pr\u00e9paration de l'extrait de levure, la distribution des peptides des prot\u00e9ines de levure est contr\u00f4l\u00e9e dans une fourchette raisonnable gr\u00e2ce \u00e0 la technologie de l'hydrolyse enzymatique contr\u00f4l\u00e9e, ce qui permet de contr\u00f4ler et d'am\u00e9liorer le go\u00fbt moelleux du produit. Gr\u00e2ce \u00e0 la combinaison d'enzymes complexes et d'enzymes aromatiques, l'amertume de l'extrait de levure est r\u00e9duite tandis que des peptides aromatiques ayant un certain go\u00fbt sont form\u00e9s, ainsi que divers acides amin\u00e9s libres, ce qui enrichit la saveur du produit ; par l'action des enzymes de la glutamine et de l'asparagine, la glutamine et l'asparagine sont converties en acide glutamique et en acide aspartique, ce qui renforce la saveur umami du produit ; par l'hydrolyse de l'ARN par les enzymes de l'acide nucl\u00e9ique et la conversion de l'AMP par la d\u00e9saminase, le GMP et l'IMP peuvent \u00eatre form\u00e9s, ce qui conf\u00e8re au produit une saveur umami incomparable.<\/p>\n<p>Le d\u00e9veloppement continu des pr\u00e9parations enzymatiques modernes a favoris\u00e9 l'innovation continue dans l'industrie des extraits de levure, rendant les produits \u00e0 base d'extraits de levure de plus en plus diversifi\u00e9s, avec des applications de plus en plus vari\u00e9es, et b\u00e9n\u00e9ficiant \u00e0 un \u00e9ventail d'industries de plus en plus large.<\/p>\n<p><!-- lc-commercial-start --><\/p>\n<h2>A practical sourcing checklist for enzyme, biotech, and food-ingredient topics<\/h2>\n<p>In enzyme and food-processing projects, the most useful decision frame is usually application fit plus process stability: which ingredient performs under the intended pH, temperature, time, and substrate conditions without creating a downstream quality or compliance problem.<\/p>\n<ul>\n<li><strong>Define the processing target first:<\/strong> flavor, hydrolysis, texture, fermentation, cleaning, and bioprocess applications often need very different activity profiles.<\/li>\n<li><strong>Check the real operating window:<\/strong> pH, temperature, residence time, and substrate type often matter more than a headline product claim.<\/li>\n<li><strong>Review consistency and downstream impact:<\/strong> dosage, sensory influence, filtration, and shelf-life behavior can all affect the final commercial value.<\/li>\n<li><strong>Use pilot validation:<\/strong> small production tests usually reveal the most useful differences in activity, efficiency, and process fit.<\/li>\n<\/ul>\n<h3>Recommended product references<\/h3>\n<ul>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/fr\/product\/lipase-cas-9001-62-1\/\">Longzyme Lipase<\/a>:<\/strong> A direct product reference for lipase-related food, cleaning, or bioprocess discussions.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/fr\/product\/beta-amylase-cas-9000-91-3\/\">Longzyme Beta-Amylase<\/a>:<\/strong> A practical enzyme reference when starch conversion and food-processing activity are under review.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/fr\/product\/compound-glucoamylase-cas-9032-08-0\/\">Longzyme Compound Glucoamylase<\/a>:<\/strong> A useful enzyme reference when saccharification or related processing performance matters.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/fr\/product\/yeast-extract-cas-8013-01-2\/\">Extrait de levure<\/a>:<\/strong> A practical ingredient reference when flavor, fermentation, or nutrient-support applications are involved.<\/li>\n<\/ul>\n<h3>FAQ for buyers and formulators<\/h3>\n<p><strong>Why is a high-activity enzyme not automatically the best commercial choice?<\/strong><br \/>Because the best enzyme is the one that performs reliably under the actual process conditions and gives the desired downstream result without creating new issues.<\/p>\n<p><strong>Should food and biotech ingredients be selected from data sheets alone?<\/strong><br \/>It is usually safer to pair the specification review with a pilot or application test because real substrates and process windows can change the result a lot.<\/p>\n<p><!-- lc-commercial-end --><\/p>\n<h2><strong><b>Contactez-nous d\u00e8s maintenant !<\/b><\/strong><\/h2>\n<h4><strong><b>Si vous avez besoin de Price, veuillez indiquer vos coordonn\u00e9es dans le formulaire ci-dessous. Nous vous contacterons g\u00e9n\u00e9ralement dans les 24 heures. Vous pouvez \u00e9galement m'envoyer un courriel\u00a0<span style=\"color: #00ccff;\"><a style=\"color: #00ccff;\" href=\"mailto:info@longchangchemical.com\">info@longchangchemical.com<\/a><\/span>\u00a0pendant les heures de travail ( 8:30 am to 6:00 pm UTC+8 Mon.~Sat. ) ou utilisez le chat en direct du site web pour obtenir une r\u00e9ponse rapide.<\/b><\/strong><\/h4>\n<table style=\"border-collapse: collapse; width: 326.27pt;\" border=\"0\" width=\"435\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et2\" style=\"height: 13.50pt; width: 164.25pt;\" width=\"219\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/compound-glucoamylase-cas-9032-08-0\/\"><span style=\"color: #00ccff;\">Compos\u00e9 Glucoamylase<\/span><\/a><\/td>\n<td class=\"et2\" style=\"width: 162.00pt;\" width=\"216\">9032-08-0<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et2\" style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/pullulanase-cas-9075-68-7\/\"><span style=\"color: #00ccff;\">Pullulanase<\/span><\/a><\/td>\n<td class=\"et2\">9075-68-7<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et2\" style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/xylanase-cas-37278-89-0\/\"><span style=\"color: #00ccff;\">Xylanase<\/span><\/a><\/td>\n<td class=\"et2\">37278-89-0<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et2\" style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/cellulase-cas-9012-54-8\/\"><span style=\"color: #00ccff;\">Cellulase<\/span><\/a><\/td>\n<td class=\"et2\">9012-54-8<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et2\" style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/naringinase-cas-9068-31-9\/\"><span style=\"color: #00ccff;\">Naringinase<\/span><\/a><\/td>\n<td class=\"et2\">9068-31-9<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et2\" style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/beta-amylase-cas-9000-91-3\/\"><span style=\"color: #00ccff;\">\u03b2-Amylase<\/span><\/a><\/td>\n<td class=\"et2\">9000-91-3<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et2\" style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/glucose-oxidase-cas-9001-37-0\/\"><span style=\"color: #00ccff;\">Glucose oxydase<\/span><\/a><\/td>\n<td class=\"et2\">9001-37-0<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et2\" style=\"height: 13.50pt;\" height=\"18\">alpha-amylase<\/td>\n<td class=\"et2\">9000-90-2<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et2\" style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/longzyme-acid-pectinase-cas-9032-75-1\/\"><span style=\"color: #00ccff;\">Pectinase<\/span><\/a><\/td>\n<td class=\"et2\">9032-75-1<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et2\" style=\"height: 13.50pt;\" height=\"18\">Peroxydase<\/td>\n<td class=\"et2\">9003-99-0<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et2\" style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/lipase-cas-9001-62-1\/\"><span style=\"color: #00ccff;\">Lipase<\/span><\/a><\/td>\n<td class=\"et2\">9001-62-1<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et2\" style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/catalase-cas-9001-05-2\/\"><span style=\"color: #00ccff;\">Catalase<\/span><\/a><\/td>\n<td class=\"et4\">9001-05-2<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et2\" style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/tannase-cas-9025-71-2\/\"><span style=\"color: #00ccff;\">TANNASE<\/span><\/a><\/td>\n<td class=\"et2\">9025-71-2<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et2\" style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/elastase-cas-39445-21-1\/\"><span style=\"color: #00ccff;\">Elastase<\/span><\/a><\/td>\n<td class=\"et2\">39445-21-1<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et2\" style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/urease-cas-9002-13-5\/\"><span style=\"color: #00ccff;\">Ur\u00e9ase<\/span><\/a><\/td>\n<td class=\"et2\">9002-13-5<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et2\" style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/dextranase-cas-9025-70-1\/\"><span style=\"color: #00ccff;\">DEXTRANASE<\/span><\/a><\/td>\n<td class=\"et2\">9025-70-1<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et2\" style=\"height: 13.5pt; text-align: left;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/l-lactic-dehydrogenase-cas-9001-60-9\/\"><span style=\"color: #00ccff;\">L-Lactique d\u00e9shydrog\u00e9nase<\/span><\/a><\/td>\n<td class=\"et2\">9001-60-9<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et2\" style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/dehydrogenase-malate-cas-9001-64-3\/\"><span style=\"color: #00ccff;\">D\u00e9shydrog\u00e9nase malate<\/span><\/a><\/td>\n<td class=\"et2\">9001-64-3<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td class=\"et2\" style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/fr\/product\/cholesterol-oxidase-cas-9028-76-6\/\"><span style=\"color: #00ccff;\">Cholest\u00e9rol oxydase<\/span><\/a><\/td>\n<td class=\"et2\">9028-76-6<\/td>\n<\/tr>\n<\/tbody>\n<\/table>","protected":false},"excerpt":{"rendered":"<p>With the continuous development of the feed industry and the continuous improvement of yeast technology, yeast hydrolysates have become one of the protein raw material alternatives in the feed industry.<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[108],"tags":[],"class_list":["post-7378","post","type-post","status-publish","format-standard","hentry","category-enzyme-news"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.3.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Application of enzyme preparations in yeast hydrolysates - Longchang Chemical<\/title>\n<meta name=\"description\" content=\"With the continuous development of the feed industry and the continuous improvement of yeast technology, yeast hydrolysates have become one of the prote...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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