دراسة جديدة تكشف العلاقة بين درجات تحميص القهوة ومستوى الكافيين

دراسة جديدة تكشف العلاقة بين درجات تحميص القهوة ومستوى الكافيين

كشفت دراسة حديثة وشاملة تأثير درجات تحميص القهوة على مستوى الكافيين المستخلص ومحتواه في المشروب النهائي، مما يتحدى بعض المعتقدات السائدة حول هذا الأمر في صناعة القهوة.

في الدراسة التي جاءت بعنوان “محتوى الكافيين في القهوة المفلترة كدالة لدرجة التحميص وعائد الاستخلاص”، قام الباحثون في كلية بيري وجامعة دريكسل بتحليل 30 تركيبة مختلفة تجمع بين أنواع البن الأخضر، درجات التحميص، وأوقات الاستخلاص.

واستخدم الباحثون تقنيات دقيقة مثل قياس الانكسار، التحليل الكروماتوجرافي عالي الأداء (HPLC)، والمجهر الإلكتروني الماسح للكشف عن ديناميكيات معقدة تتحكم في استخراج الكافيين.

وبحسب الخبراء، لطالما كان هناك جدل حول العلاقة بين درجات التحميص ومحتوى الكافيين، إلا أن هذه الدراسة تقدم تفسيرات مهمة من خلال عزل العوامل التي غالبًا ما أربكت النتائج السابقة.

  1. وتوصل الباحثون في الدراسة إلى نتائج مهمة، أبرزها:
  2. وصل محتوى الكافيين إلى ذروته عند التحميص بدرجات فقدان الكتلة بين 14-16٪، وهو ما يتوافق مع مستويات التحميص الفاتح إلى المتوسط. أما درجات التحميص الداكن، فقد أظهرت انخفاضًا عامًا في مستويات الكافيين.
  3. عند مقارنة المشروبات التي لها نفس مستوى الاستخلاص، أظهرت القهوة المحمصة بدرجات داكنة تركيزات أعلى من الكافيين، مما يتحدى الاعتقاد السائد بأن التحميص الفاتح يحتوي دائمًا على المزيد من الكافيين.
  4. مع تقدم عملية التحميص، تصبح حبوب القهوة أكثر مسامية، مما يعزز كفاءة الاستخلاص. لكن هذا التأثير يتلاشى بسبب خسائر الكافيين الناتجة عن التطاير عند درجات حرارة التحميص المرتفعة.

اعتمد الباحثون في دراستهم على أسلوب صارم لضمان الدقة وإمكانية التكرار. تم اختيار أنواع القهوة الإثيوبية، بما في ذلك القهوة الطبيعية (المعالجة الجافة) والمغسولة (المعالجة الرطبة)، لتنوع خصائصها. وتم تحضير خمس درجات مختلفة من التحميص باستخدام جهاز تحميص كهربائي متقدم (Aillio Bullet v2). ثم تم قياس خصائص كل درجة تحميص باستخدام معايير دقيقة مثل اللون والكثافة ونسبة فقدان الكتلة.

تمت عملية التحضير باستخدام أداة AeroPress بمعايير ثابتة، بما في ذلك نسبة الماء إلى القهوة (1:15). تم اختبار أوقات تحضير مختلفة (1، 2، و10 دقائق) لملاحظة الاختلافات في معدلات الاستخلاص. وللحد من التأثيرات الخارجية، تم التحكم في حجم الطحن من خلال الغربلة واستخدام ماء مُفلتر بخصائص كيميائية ثابتة.

أوضحت الدراسة أن معدل الاستخلاص – أي نسبة المركبات القابلة للذوبان المستخلصة من القهوة المطحونة – يلعب دورًا حاسمًا في تحديد مستوى الكافيين. وأظهرت النتائج اتجاهًا لتناقص معدلات الاستخلاص مع زيادة درجات التحميص الداكن، وهو ما يُعزى إلى تحلل المركبات القابلة للذوبان أثناء عملية التحميص.

رغم ذلك، أظهرت القهوة المحمصة بدرجات داكنة تركيزات أعلى من الكافيين عند مستويات استخلاص متساوية، وذلك بسبب انخفاض وجود مركبات أخرى قابلة للذوبان في التحميص الداكن، مما يتيح للكافيين أن يمثل نسبة أكبر من المادة المستخلصة.

كشفت الدراسة أيضًا عن دور المسامية في ديناميكيات الاستخلاص. باستخدام المجهر الإلكتروني الماسح، تم قياس التغيرات في المسامية عبر درجات التحميص المختلفة. ووجد الباحثون أن حبوب القهوة تصبح أكثر مسامية مع التقدم في عملية التحميص، مما يعزز من كفاءة استخراج المركبات القابلة للذوبان أثناء التخمير.

مع ذلك، أظهرت النتائج أن التحميص الداكن جدًا يؤدي إلى تراجع في احتفاظ الكافيين بسبب انهيار الهيكل الداخلي للحبوب.

لم تقتصر الدراسة على الكافيين فقط، بل تناولت أيضًا الأحماض الكلوروجينية، التي تُعتبر من مضادات الأكسدة المهمة. أظهرت الدراسة أن تركيزات هذه الأحماض تقل بشكل ملحوظ مع زيادة درجات التحميص، مما يجعل التحميص الفاتح خيارًا أفضل لمن يسعون للحصول على فوائدها الصحية.

توفر هذه الدراسة رؤى قيمة لمحبي القهوة حول كيفية تأثير خياراتهم في التخمير على مستوى الكافيين. فبينما يوفر التحميص الفاتح والمتوسط مستويات أعلى من الكافيين في الظروف العادية، يمكن تحقيق تركيزات مقاربة من التحميص الداكن إذا تم تحسين معايير الاستخلاص. بالإضافة إلى ذلك، تشير النتائج إلى أن التحميص الفاتح قد يكون أكثر احتفاظًا بالمركبات المفيدة مثل الأحماض الكلوروجينية.

تناولت الدراسة إشكالية التباين في النتائج السابقة المتعلقة بالتحميص ومستوى الكافيين. فقد أظهرت الأبحاث السابقة نتائج متناقضة بسبب اختلاف طرق التخمير، أحجام الطحن، وخصائص الماء المستخدم. من خلال توحيد هذه المتغيرات، توفر الدراسة إطارًا أكثر موثوقية لفهم تأثير التحميص.

تمثل هذه النتائج أهمية كبيرة للمهنيين في صناعة القهوة، من المحمصين إلى صناع القهوة. إذ يمكن للمحمصين تعديل ملفات التحميص لتحقيق التوازن بين احتفاظ الكافيين وتطوير النكهات، في حين يمكن لصناع القهوة تحسين طرق التخمير لاستخلاص المركبات المطلوبة.

علاوة على ذلك، تتماشى الدراسة مع الطلب المتزايد على الشفافية في صناعة القهوة المختصة، مما يعزز فهم المستهلكين لجوانب علمية دقيقة تتعلق بمشروبهم المفضل.

رغم القيمة الكبيرة لهذه الدراسة، فإنها تفتح المجال لاستكشاف أسئلة إضافية. هل يمكن أن تنتج طرق تخمير مختلفة مثل الإسبريسو أو التخمير البارد نتائج مماثلة؟ وكيف تؤثر عوامل أخرى مثل ارتفاع زراعة القهوة وطرق معالجتها على ديناميكيات الكافيين؟

تؤكد هذه الدراسة الرائدة على التعقيد المدهش للقهوة، حيث تؤثر كل متغيراتها – من منشأ الحبوب إلى درجة التحميص وطريقة التخمير – على النتيجة النهائية. من خلال الكشف عن الديناميكيات المعقدة لاستخلاص الكافيين، تسهم الدراسة في تعزيز فهم علم القهوة، مما يمكّن المهنيين والمستهلكين من اتخاذ قرارات مستنيرة.

مع تزايد شعبية القهوة المختصة، تذكرنا هذه الدراسات دائمًا بوجود المزيد لاكتشافه حول هذا المشروب العالمي المفضل.

Spread the love
نشر في :
We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners. View more
Cookies settings
Accept
Privacy & Cookie policy
Privacy & Cookies policy
Cookie name Active
[:ar]Privacy Policy for qahwa world At qahwaworld, accessible from qahwaworld.com, one of our main priorities is the privacy of our visitors. This Privacy Policy document contains types of information that is collected and recorded by qahwaworld and how we use it. If you have additional questions or require more information about our Privacy Policy, do not hesitate to contact us. This Privacy Policy applies only to our online activities and is valid for visitors to our website with regards to the information that they shared and/or collect in qahwaworld. This policy is not applicable to any information collected offline or via channels other than this website. Our Privacy Policy was created with the help of the Free Privacy Policy Generator. Consent By using our website, you hereby consent to our Privacy Policy and agree to its terms. Information we collect The personal information that you are asked to provide, and the reasons why you are asked to provide it, will be made clear to you at the point we ask you to provide your personal information. If you contact us directly, we may receive additional information about you such as your name, email address, phone number, the contents of the message and/or attachments you may send us, and any other information you may choose to provide. When you register for an Account, we may ask for your contact information, including items such as name, company name, address, email address, and telephone number. How we use your information We use the information we collect in various ways, including to: Provide, operate, and maintain our website Improve, personalize, and expand our website Understand and analyze how you use our website Develop new products, services, features, and functionality Communicate with you, either directly or through one of our partners, including for customer service, to provide you with updates and other information relating to the website, and for marketing and promotional purposes Send you emails Find and prevent fraud Log Files qahwaworld follows a standard procedure of using log files. These files log visitors when they visit websites. All hosting companies do this and a part of hosting services' analytics. The information collected by log files include internet protocol (IP) addresses, browser type, Internet Service Provider (ISP), date and time stamp, referring/exit pages, and possibly the number of clicks. These are not linked to any information that is personally identifiable. The purpose of the information is for analyzing trends, administering the site, tracking users' movement on the website, and gathering demographic information. Cookies and Web Beacons Like any other website, qahwaworld uses 'cookies'. These cookies are used to store information including visitors' preferences, and the pages on the website that the visitor accessed or visited. The information is used to optimize the users' experience by customizing our web page content based on visitors' browser type and/or other information. For more general information on cookies, please read the Cookies article on Generate Privacy Policy website. Google DoubleClick DART Cookie Google is one of a third-party vendor on our site. It also uses cookies, known as DART cookies, to serve ads to our site visitors based upon their visit to www.website.com and other sites on the internet. However, visitors may choose to decline the use of DART cookies by visiting the Google ad and content network Privacy Policy at the following URL – https://policies.google.com/technologies/ads Our Advertising Partners Some of advertisers on our site may use cookies and web beacons. Our advertising partners are listed below. Each of our advertising partners has their own Privacy Policy for their policies on user data. For easier access, we hyperlinked to their Privacy Policies below. Google https://policies.google.com/technologies/ads Advertising Partners Privacy Policies You may consult this list to find the Privacy Policy for each of the advertising partners of qahwaworld. Third-party ad servers or ad networks uses technologies like cookies, JavaScript, or Web Beacons that are used in their respective advertisements and links that appear on qahwaworld, which are sent directly to users' browser. They automatically receive your IP address when this occurs. These technologies are used to measure the effectiveness of their advertising campaigns and/or to personalize the advertising content that you see on websites that you visit. Note that qahwaworld has no access to or control over these cookies that are used by third-party advertisers. Third Party Privacy Policies qahwaworld's Privacy Policy does not apply to other advertisers or websites. Thus, we are advising you to consult the respective Privacy Policies of these third-party ad servers for more detailed information. It may include their practices and instructions about how to opt-out of certain options. You can choose to disable cookies through your individual browser options. To know more detailed information about cookie management with specific web browsers, it can be found at the browsers' respective websites. CCPA Privacy Rights (Do Not Sell My Personal Information) Under the CCPA, among other rights, California consumers have the right to: Request that a business that collects a consumer's personal data disclose the categories and specific pieces of personal data that a business has collected about consumers. Request that a business delete any personal data about the consumer that a business has collected. Request that a business that sells a consumer's personal data, not sell the consumer's personal data. If you make a request, we have one month to respond to you. If you would like to exercise any of these rights, please contact us. GDPR Data Protection Rights We would like to make sure you are fully aware of all of your data protection rights. Every user is entitled to the following: The right to access – You have the right to request copies of your personal data. We may charge you a small fee for this service. The right to rectification – You have the right to request that we correct any information you believe is inaccurate. You also have the right to request that we complete the information you believe is incomplete. The right to erasure – You have the right to request that we erase your personal data, under certain conditions. The right to restrict processing – You have the right to request that we restrict the processing of your personal data, under certain conditions. The right to object to processing – You have the right to object to our processing of your personal data, under certain conditions. The right to data portability – You have the right to request that we transfer the data that we have collected to another organization, or directly to you, under certain conditions. If you make a request, we have one month to respond to you. If you would like to exercise any of these rights, please contact us. Children's Information Another part of our priority is adding protection for children while using the internet. We encourage parents and guardians to observe, participate in, and/or monitor and guide their online activity. qahwaworld does not knowingly collect any Personal Identifiable Information from children under the age of 13. If you think that your child provided this kind of information on our website, we strongly encourage you to contact us immediately and we will do our best efforts to promptly remove such information from our records.[:en]

Privacy Policy for Qahwa World

At Qahwa World, accessible from https://qahwaworld.com, one of our main priorities is the privacy of our visitors. This Privacy Policy document contains types of information that is collected and recorded by Qahwa World and how we use it. If you have additional questions or require more information about our Privacy Policy, do not hesitate to contact us. This Privacy Policy applies only to our online activities and is valid for visitors to our website with regards to the information that they shared and/or collect in Qahwa World. This policy is not applicable to any information collected offline or via channels other than this website. Our Privacy Policy was created with the help of the Free Privacy Policy Generator.

Consent

By using our website, you hereby consent to our Privacy Policy and agree to its terms.

Information we collect

The personal information that you are asked to provide, and the reasons why you are asked to provide it, will be made clear to you at the point we ask you to provide your personal information. If you contact us directly, we may receive additional information about you such as your name, email address, phone number, the contents of the message and/or attachments you may send us, and any other information you may choose to provide. When you register for an Account, we may ask for your contact information, including items such as name, company name, address, email address, and telephone number.

How we use your information

We use the information we collect in various ways, including to:
  • Provide, operate, and maintain our website
  • Improve, personalize, and expand our website
  • Understand and analyze how you use our website
  • Develop new products, services, features, and functionality
  • Communicate with you, either directly or through one of our partners, including for customer service, to provide you with updates and other information relating to the website, and for marketing and promotional purposes
  • Send you emails
  • Find and prevent fraud

Log Files

Qahwa World follows a standard procedure of using log files. These files log visitors when they visit websites. All hosting companies do this and a part of hosting services' analytics. The information collected by log files include internet protocol (IP) addresses, browser type, Internet Service Provider (ISP), date and time stamp, referring/exit pages, and possibly the number of clicks. These are not linked to any information that is personally identifiable. The purpose of the information is for analyzing trends, administering the site, tracking users' movement on the website, and gathering demographic information.

Cookies and Web Beacons

Like any other website, Qahwa World uses 'cookies'. These cookies are used to store information including visitors' preferences, and the pages on the website that the visitor accessed or visited. The information is used to optimize the users' experience by customizing our web page content based on visitors' browser type and/or other information. For more general information on cookies, please read the Cookies article on Generate Privacy Policy website.

Google DoubleClick DART Cookie

Google is one of a third-party vendor on our site. It also uses cookies, known as DART cookies, to serve ads to our site visitors based upon their visit to www.website.com and other sites on the internet. However, visitors may choose to decline the use of DART cookies by visiting the Google ad and content network Privacy Policy at the following URL – https://policies.google.com/technologies/ads

Our Advertising Partners

Some of advertisers on our site may use cookies and web beacons. Our advertising partners are listed below. Each of our advertising partners has their own Privacy Policy for their policies on user data. For easier access, we hyperlinked to their Privacy Policies below.

Advertising Partners Privacy Policies

You may consult this list to find the Privacy Policy for each of the advertising partners of Qahwa World. Third-party ad servers or ad networks uses technologies like cookies, JavaScript, or Web Beacons that are used in their respective advertisements and links that appear on Qahwa World, which are sent directly to users' browser. They automatically receive your IP address when this occurs. These technologies are used to measure the effectiveness of their advertising campaigns and/or to personalize the advertising content that you see on websites that you visit. Note that Qahwa World has no access to or control over these cookies that are used by third-party advertisers.

Third Party Privacy Policies

Qahwa World's Privacy Policy does not apply to other advertisers or websites. Thus, we are advising you to consult the respective Privacy Policies of these third-party ad servers for more detailed information. It may include their practices and instructions about how to opt-out of certain options. You can choose to disable cookies through your individual browser options. To know more detailed information about cookie management with specific web browsers, it can be found at the browsers' respective websites.

CCPA Privacy Rights (Do Not Sell My Personal Information)

Under the CCPA, among other rights, California consumers have the right to: Request that a business that collects a consumer's personal data disclose the categories and specific pieces of personal data that a business has collected about consumers. Request that a business delete any personal data about the consumer that a business has collected. Request that a business that sells a consumer's personal data, not sell the consumer's personal data. If you make a request, we have one month to respond to you. If you would like to exercise any of these rights, please contact us.

GDPR Data Protection Rights

We would like to make sure you are fully aware of all of your data protection rights. Every user is entitled to the following: The right to access – You have the right to request copies of your personal data. We may charge you a small fee for this service. The right to rectification – You have the right to request that we correct any information you believe is inaccurate. You also have the right to request that we complete the information you believe is incomplete. The right to erasure – You have the right to request that we erase your personal data, under certain conditions. The right to restrict processing – You have the right to request that we restrict the processing of your personal data, under certain conditions. The right to object to processing – You have the right to object to our processing of your personal data, under certain conditions. The right to data portability – You have the right to request that we transfer the data that we have collected to another organization, or directly to you, under certain conditions. If you make a request, we have one month to respond to you. If you would like to exercise any of these rights, please contact us.

Children's Information

Another part of our priority is adding protection for children while using the internet. We encourage parents and guardians to observe, participate in, and/or monitor and guide their online activity. Qahwa World does not knowingly collect any Personal Identifiable Information from children under the age of 13. If you think that your child provided this kind of information on our website, we strongly encourage you to contact us immediately and we will do our best efforts to promptly remove such information from our records.[:ru]Privacy Policy for qahwa world At qahwaworld, accessible from qahwaworld.com, one of our main priorities is the privacy of our visitors. This Privacy Policy document contains types of information that is collected and recorded by qahwaworld and how we use it. If you have additional questions or require more information about our Privacy Policy, do not hesitate to contact us. This Privacy Policy applies only to our online activities and is valid for visitors to our website with regards to the information that they shared and/or collect in qahwaworld. This policy is not applicable to any information collected offline or via channels other than this website. Our Privacy Policy was created with the help of the Free Privacy Policy Generator. Consent By using our website, you hereby consent to our Privacy Policy and agree to its terms. Information we collect The personal information that you are asked to provide, and the reasons why you are asked to provide it, will be made clear to you at the point we ask you to provide your personal information. If you contact us directly, we may receive additional information about you such as your name, email address, phone number, the contents of the message and/or attachments you may send us, and any other information you may choose to provide. When you register for an Account, we may ask for your contact information, including items such as name, company name, address, email address, and telephone number. How we use your information We use the information we collect in various ways, including to: Provide, operate, and maintain our website Improve, personalize, and expand our website Understand and analyze how you use our website Develop new products, services, features, and functionality Communicate with you, either directly or through one of our partners, including for customer service, to provide you with updates and other information relating to the website, and for marketing and promotional purposes Send you emails Find and prevent fraud Log Files qahwaworld follows a standard procedure of using log files. These files log visitors when they visit websites. All hosting companies do this and a part of hosting services' analytics. The information collected by log files include internet protocol (IP) addresses, browser type, Internet Service Provider (ISP), date and time stamp, referring/exit pages, and possibly the number of clicks. These are not linked to any information that is personally identifiable. The purpose of the information is for analyzing trends, administering the site, tracking users' movement on the website, and gathering demographic information. Cookies and Web Beacons Like any other website, qahwaworld uses 'cookies'. These cookies are used to store information including visitors' preferences, and the pages on the website that the visitor accessed or visited. The information is used to optimize the users' experience by customizing our web page content based on visitors' browser type and/or other information. For more general information on cookies, please read the Cookies article on Generate Privacy Policy website. Google DoubleClick DART Cookie Google is one of a third-party vendor on our site. It also uses cookies, known as DART cookies, to serve ads to our site visitors based upon their visit to www.website.com and other sites on the internet. However, visitors may choose to decline the use of DART cookies by visiting the Google ad and content network Privacy Policy at the following URL – https://policies.google.com/technologies/ads Our Advertising Partners Some of advertisers on our site may use cookies and web beacons. Our advertising partners are listed below. Each of our advertising partners has their own Privacy Policy for their policies on user data. For easier access, we hyperlinked to their Privacy Policies below. Google https://policies.google.com/technologies/ads Advertising Partners Privacy Policies You may consult this list to find the Privacy Policy for each of the advertising partners of qahwaworld. Third-party ad servers or ad networks uses technologies like cookies, JavaScript, or Web Beacons that are used in their respective advertisements and links that appear on qahwaworld, which are sent directly to users' browser. They automatically receive your IP address when this occurs. These technologies are used to measure the effectiveness of their advertising campaigns and/or to personalize the advertising content that you see on websites that you visit. Note that qahwaworld has no access to or control over these cookies that are used by third-party advertisers. Third Party Privacy Policies qahwaworld's Privacy Policy does not apply to other advertisers or websites. Thus, we are advising you to consult the respective Privacy Policies of these third-party ad servers for more detailed information. It may include their practices and instructions about how to opt-out of certain options. You can choose to disable cookies through your individual browser options. To know more detailed information about cookie management with specific web browsers, it can be found at the browsers' respective websites. CCPA Privacy Rights (Do Not Sell My Personal Information) Under the CCPA, among other rights, California consumers have the right to: Request that a business that collects a consumer's personal data disclose the categories and specific pieces of personal data that a business has collected about consumers. Request that a business delete any personal data about the consumer that a business has collected. Request that a business that sells a consumer's personal data, not sell the consumer's personal data. If you make a request, we have one month to respond to you. If you would like to exercise any of these rights, please contact us. GDPR Data Protection Rights We would like to make sure you are fully aware of all of your data protection rights. Every user is entitled to the following: The right to access – You have the right to request copies of your personal data. We may charge you a small fee for this service. The right to rectification – You have the right to request that we correct any information you believe is inaccurate. You also have the right to request that we complete the information you believe is incomplete. The right to erasure – You have the right to request that we erase your personal data, under certain conditions. The right to restrict processing – You have the right to request that we restrict the processing of your personal data, under certain conditions. The right to object to processing – You have the right to object to our processing of your personal data, under certain conditions. The right to data portability – You have the right to request that we transfer the data that we have collected to another organization, or directly to you, under certain conditions. If you make a request, we have one month to respond to you. If you would like to exercise any of these rights, please contact us. Children's Information Another part of our priority is adding protection for children while using the internet. We encourage parents and guardians to observe, participate in, and/or monitor and guide their online activity. qahwaworld does not knowingly collect any Personal Identifiable Information from children under the age of 13. If you think that your child provided this kind of information on our website, we strongly encourage you to contact us immediately and we will do our best efforts to promptly remove such information from our records.[:]
Save settings
Cookies settings