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url url url url
  2. Weltenzyklopädie
  3. لاکتوز - ویکی‌پدیا، دانشنامهٔ آزاد
لاکتوز - ویکی‌پدیا، دانشنامهٔ آزاد
از ویکی‌پدیا، دانشنامهٔ آزاد
لاکتوز (قند شیر)
نام‌گذاری آیوپاک

β-D-galactopyranosyl-(1→4)-D-glucose

دیگر نام‌ها

Milk sugar
4-O-β-D-galactopyranosyl-D-glucose

شناساگرها
شماره ثبت سی‌ای‌اس ۶۳-۴۲-۳ ✔Y
پاب‌کم ۶۱۳۴
کم‌اسپایدر ۵۹۰۴ ✔Y
EC-number 200-559-2
ChEMBL CHEMBL۱۱۵۹۶۵۱ N
جی‌مول-تصاویر سه بعدی Image 1

  • C([C@@H]1[C@@H]([C@@H]([C@H]([C@@H](O1)O[C@@H]2[C@H](O[C@H]([C@@H]([C@H]2O)O)O)CO)O)O)O)O

  • InChI=1S/C12H22O11/c۱۳-۱-۳-۵(۱۵)۶(۱۶)۹(۱۹)۱۲(۲۲–۳)۲۳-۱۰-۴(۲–۱۴)۲۱–۱۱(۲۰)۸(۱۸)۷(۱۰)۱۷/h3-20H,1–2H2/t3-,4-,5+,6+,7-,8-,9-,10-,11-,12+/m1/s۱ ✔Y
    Key: GUBGYTABKSRVRQ-DCSYEGIMSA-N ✔Y

    InChI=1/C12H22O11/c۱۳-۱-۳-۵(۱۵)۶(۱۶)۹(۱۹)۱۲(۲۲–۳)۲۳-۱۰-۴(۲–۱۴)۲۱–۱۱(۲۰)۸(۱۸)۷(۱۰)۱۷/h3-20H,1–2H2/t3-,4-,5+,6+,7-,8-,9-,10-,11-,12+/m1/s۱
    Key: GUBGYTABKSRVRQ-DCSYEGIMBP

خصوصیات
فرمول مولکولی C12H22O11
جرم مولی 342.30 g/mol
شکل ظاهری white solid
چگالی 1.525 g/cm3
دمای ذوب ۲۰۲٫۸°C[۱]
دمای جوش ۶۶۷٫۹°C[۱]
انحلال‌پذیری در آب 21.6 g/100 mL[۲]
ترموشیمی
Std enthalpy of
combustion ΔcHo298 		5652 kJ/mol 1351 kcal/mol 16.5 kJ/g 3.94 kcal/g
خطرات
شاخص ئی‌یو not listed
نقطه اشتعال
به استثنای جایی که اشاره شده‌است در غیر این صورت، داده‌ها برای مواد به وضعیت استانداردشان داده شده‌اند (در 25 °C (۷۷ °F)، ۱۰۰ kPa)
 N (بررسی) (چیست: ✔Y/N؟)
Infobox references


لاکتوز، لاکتُز یا قند شیر، یک نوع شکر است که به وفور در شیر یافت می‌شود. نام لاکتوز از کون ز لاکت (lacte) که درلاتین به معنای شیر است و پسوند اوز (ose)که برای نامگذاری قندهابکار می‌رود ریشه گرفته‌است. و از ترکیب گلوکز و گالاکتوز ساخته شده‌است.

به ۳ شکل یافت می‌شود که عبارت است از:

  1. آلفا -هیدرات
  2. بتا-ان هیدرات
  3. آمورف

ترکیب شیمیایی

لاکتوز از پیوند گلیکوزیدی بین یک گالاکتوز و یک گلوکز به وجود می‌آید. اتصال این دو منو ساکارید (گالاکتوز و گلوکز) از نوع گلیکوزیدی و به‌شکل بتا دی گالاکتوپیرانوزیل(۱ به ۴)بتا دی گلوکو پیرانوز می‌باشد.

منابع

  1. ↑ ۱٫۰ ۱٫۱ ۱٫۲ Anonymous. Sigma Aldrich. Lactose Product. https://www.sigmaaldrich.com/US/en/product/sial/17814 بایگانی‌شده در ۱۶ ژوئیه ۲۰۱۱ توسط Wayback Machine St. Louis MO.
  2. ↑ The solubility of lactose in water is ۱۸٫۹۰۴۹ g at 25°C, ۲۵٫۱۴۸۴ g at 40°C and ۳۷٫۲۱۴۹ g at 60°C per ۱۰۰ g solution. Its solubility in اتانول is ۰٫۰۱۱۱ g at 40°C and ۰٫۰۲۷۰ g at 60°C per ۱۰۰ g solution.Machado, José J. B.; Coutinho, João A.; Macedo, Eugénia A. (2001), "Solid–liquid equilibrium of α-lactose in ethanol/water" (PDF), Fluid Phase Equilibria, 173 (1): 121–34, doi:10٫1016/S0378-3812(00)00388-5 {{citation}}: Check |doi= value (help). ds
  • ویکی‌پدیای انگلیسی

Wikipedia contributors, "Lactose," Wikipedia, The Free Encyclopedia, http://en.wikipedia.org/w/index.php?title=Lactose&oldid=322829259 (accessed November 13، ۲۰۰۹).

اندیس

Pusat Layanan

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