SKU: 31140615632

Multi-Species VA (Vitamin A) ELISA Kit

Sale price$289.80 Regular price$322.00
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Ships within 48 hours · Estimated delivery Jul 26 - Jul 31

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Description

Multi-Species VA (Vitamin A) ELISA KitThe VA (Vitamin A) ELISA kit uses the Competitive ELISA principle. The micro ELISA plate provided in this kit has been pre coated with Universal VA. During the reaction, Universal VA in the sample or standard competes with a fixed amount of Universal VA on the solid phase supporter for sites on the Biotinylated Detection Ab specific to Universal VA. Excess conjugate and unbound sample or standard are washed away, and Avidin Horseradish Peroxidase

The VA (Vitamin A) ELISA kit uses the Competitive-ELISA principle. The micro ELISA plate provided in this kit has been pre-coated with Universal VA. During the reaction, Universal VA in the sample or standard competes with a fixed amount of Universal VA on the solid phase supporter for sites on the Biotinylated Detection Ab specific to Universal VA. Excess conjugate and unbound sample or standard are washed away, and Avidin-Horseradish Peroxidase (HRP) conjugate are added to each micro plate well and incubated. Then a TMB substrate solution is added to each well. The enzyme-substrate reaction is terminated by the addition of stop solution and the color turns from blue to yellow. The optical density (OD) is measured spectrophotometrically at a wavelength of 450 nm ± 2 nm. The concentration of Universal VA in tested samples can be calculated by comparing the OD of the samples to the standard curve.

Shipping Notes
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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
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SKU: 31140615632

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4.2 ★★★★★
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eugene kennedy
Louisville, US
★★★★★ 5
Great product
Color: two tone blue
Will need adjustment. Great looking watch
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Reviewed in the United States on June 2, 2026
J
Verified Purchase
Johnie B
West Palm Beach, US
★★★★★ 3
3 stars
Color: all black watch
It’s not an ugly watch, but I did not think the watch looked as nice in person This watch lost several minutes over a few months. It is light and feels cheap. However, it was not expensive, it’s comfortable to wear and beauty is in the eye of the beholder.
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Reviewed in the United States on July 15, 2025
D
Verified Purchase
Doesn’t work with him reads error on all three new filters.
Phoenix, US
★★★★★ 1
The band is hollow and the watch doesn’t feel well built
Color: gold watch for men
Cheaply mad, I purchased a expensive watch and it’s nice but the cheap one is definitely what you pay for will not buy or recommend to anyone
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Reviewed in the United States on April 26, 2026
D
Verified Purchase
D J
Bozeman, US
★★★★★ 5
Lots of compliments
Color: two tone green
While it's not too flashy. I seem to get many compliments on this watch especially when I wear my green shoes
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Reviewed in the United States on March 21, 2026
N
Verified Purchase
Nicholas H. Van Slyck
Grantham, US
★★★★★ 5
Attractive & Functional Wallet
Great wallet. Light, compact, and quality materials. All necessary credit cards and IDs fit comfortably with room to spare. Overall, it’s an attractive and functional wallet.
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Reviewed in the United States on December 11, 2025

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